Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef _LINUX_MM_H |
3 | #define _LINUX_MM_H | |
4 | ||
1da177e4 | 5 | #include <linux/errno.h> |
309381fe | 6 | #include <linux/mmdebug.h> |
1da177e4 | 7 | #include <linux/gfp.h> |
187f1882 | 8 | #include <linux/bug.h> |
1da177e4 LT |
9 | #include <linux/list.h> |
10 | #include <linux/mmzone.h> | |
11 | #include <linux/rbtree.h> | |
83aeeada | 12 | #include <linux/atomic.h> |
9a11b49a | 13 | #include <linux/debug_locks.h> |
5b99cd0e | 14 | #include <linux/mm_types.h> |
9740ca4e | 15 | #include <linux/mmap_lock.h> |
08677214 | 16 | #include <linux/range.h> |
c6f6b596 | 17 | #include <linux/pfn.h> |
3565fce3 | 18 | #include <linux/percpu-refcount.h> |
e9da73d6 | 19 | #include <linux/bit_spinlock.h> |
b0d40c92 | 20 | #include <linux/shrinker.h> |
9c599024 | 21 | #include <linux/resource.h> |
e30825f1 | 22 | #include <linux/page_ext.h> |
8025e5dd | 23 | #include <linux/err.h> |
41901567 | 24 | #include <linux/page-flags.h> |
fe896d18 | 25 | #include <linux/page_ref.h> |
3b3b1a29 | 26 | #include <linux/overflow.h> |
b5420237 | 27 | #include <linux/sizes.h> |
7969f226 | 28 | #include <linux/sched.h> |
65fddcfc | 29 | #include <linux/pgtable.h> |
34303244 | 30 | #include <linux/kasan.h> |
f25cbb7a | 31 | #include <linux/memremap.h> |
1da177e4 LT |
32 | |
33 | struct mempolicy; | |
34 | struct anon_vma; | |
bf181b9f | 35 | struct anon_vma_chain; |
e8edc6e0 | 36 | struct user_struct; |
bce617ed | 37 | struct pt_regs; |
1da177e4 | 38 | |
5ef64cc8 LT |
39 | extern int sysctl_page_lock_unfairness; |
40 | ||
597b7305 MH |
41 | void init_mm_internals(void); |
42 | ||
a9ee6cf5 | 43 | #ifndef CONFIG_NUMA /* Don't use mapnrs, do it properly */ |
1da177e4 | 44 | extern unsigned long max_mapnr; |
fccc9987 JL |
45 | |
46 | static inline void set_max_mapnr(unsigned long limit) | |
47 | { | |
48 | max_mapnr = limit; | |
49 | } | |
50 | #else | |
51 | static inline void set_max_mapnr(unsigned long limit) { } | |
1da177e4 LT |
52 | #endif |
53 | ||
ca79b0c2 AK |
54 | extern atomic_long_t _totalram_pages; |
55 | static inline unsigned long totalram_pages(void) | |
56 | { | |
57 | return (unsigned long)atomic_long_read(&_totalram_pages); | |
58 | } | |
59 | ||
60 | static inline void totalram_pages_inc(void) | |
61 | { | |
62 | atomic_long_inc(&_totalram_pages); | |
63 | } | |
64 | ||
65 | static inline void totalram_pages_dec(void) | |
66 | { | |
67 | atomic_long_dec(&_totalram_pages); | |
68 | } | |
69 | ||
70 | static inline void totalram_pages_add(long count) | |
71 | { | |
72 | atomic_long_add(count, &_totalram_pages); | |
73 | } | |
74 | ||
1da177e4 | 75 | extern void * high_memory; |
1da177e4 | 76 | extern int page_cluster; |
ea0ffd0c | 77 | extern const int page_cluster_max; |
1da177e4 LT |
78 | |
79 | #ifdef CONFIG_SYSCTL | |
80 | extern int sysctl_legacy_va_layout; | |
81 | #else | |
82 | #define sysctl_legacy_va_layout 0 | |
83 | #endif | |
84 | ||
d07e2259 DC |
85 | #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS |
86 | extern const int mmap_rnd_bits_min; | |
87 | extern const int mmap_rnd_bits_max; | |
88 | extern int mmap_rnd_bits __read_mostly; | |
89 | #endif | |
90 | #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS | |
91 | extern const int mmap_rnd_compat_bits_min; | |
92 | extern const int mmap_rnd_compat_bits_max; | |
93 | extern int mmap_rnd_compat_bits __read_mostly; | |
94 | #endif | |
95 | ||
1da177e4 | 96 | #include <asm/page.h> |
1da177e4 | 97 | #include <asm/processor.h> |
1da177e4 | 98 | |
d9344522 AK |
99 | /* |
100 | * Architectures that support memory tagging (assigning tags to memory regions, | |
101 | * embedding these tags into addresses that point to these memory regions, and | |
102 | * checking that the memory and the pointer tags match on memory accesses) | |
103 | * redefine this macro to strip tags from pointers. | |
f0953a1b | 104 | * It's defined as noop for architectures that don't support memory tagging. |
d9344522 AK |
105 | */ |
106 | #ifndef untagged_addr | |
107 | #define untagged_addr(addr) (addr) | |
108 | #endif | |
109 | ||
79442ed1 TC |
110 | #ifndef __pa_symbol |
111 | #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0)) | |
112 | #endif | |
113 | ||
1dff8083 AB |
114 | #ifndef page_to_virt |
115 | #define page_to_virt(x) __va(PFN_PHYS(page_to_pfn(x))) | |
116 | #endif | |
117 | ||
568c5fe5 LA |
118 | #ifndef lm_alias |
119 | #define lm_alias(x) __va(__pa_symbol(x)) | |
120 | #endif | |
121 | ||
593befa6 DD |
122 | /* |
123 | * To prevent common memory management code establishing | |
124 | * a zero page mapping on a read fault. | |
125 | * This macro should be defined within <asm/pgtable.h>. | |
126 | * s390 does this to prevent multiplexing of hardware bits | |
127 | * related to the physical page in case of virtualization. | |
128 | */ | |
129 | #ifndef mm_forbids_zeropage | |
130 | #define mm_forbids_zeropage(X) (0) | |
131 | #endif | |
132 | ||
a4a3ede2 PT |
133 | /* |
134 | * On some architectures it is expensive to call memset() for small sizes. | |
5470dea4 AD |
135 | * If an architecture decides to implement their own version of |
136 | * mm_zero_struct_page they should wrap the defines below in a #ifndef and | |
137 | * define their own version of this macro in <asm/pgtable.h> | |
a4a3ede2 | 138 | */ |
5470dea4 AD |
139 | #if BITS_PER_LONG == 64 |
140 | /* This function must be updated when the size of struct page grows above 80 | |
141 | * or reduces below 56. The idea that compiler optimizes out switch() | |
142 | * statement, and only leaves move/store instructions. Also the compiler can | |
c4ffefd1 | 143 | * combine write statements if they are both assignments and can be reordered, |
5470dea4 AD |
144 | * this can result in several of the writes here being dropped. |
145 | */ | |
146 | #define mm_zero_struct_page(pp) __mm_zero_struct_page(pp) | |
147 | static inline void __mm_zero_struct_page(struct page *page) | |
148 | { | |
149 | unsigned long *_pp = (void *)page; | |
150 | ||
151 | /* Check that struct page is either 56, 64, 72, or 80 bytes */ | |
152 | BUILD_BUG_ON(sizeof(struct page) & 7); | |
153 | BUILD_BUG_ON(sizeof(struct page) < 56); | |
154 | BUILD_BUG_ON(sizeof(struct page) > 80); | |
155 | ||
156 | switch (sizeof(struct page)) { | |
157 | case 80: | |
df561f66 GS |
158 | _pp[9] = 0; |
159 | fallthrough; | |
5470dea4 | 160 | case 72: |
df561f66 GS |
161 | _pp[8] = 0; |
162 | fallthrough; | |
5470dea4 | 163 | case 64: |
df561f66 GS |
164 | _pp[7] = 0; |
165 | fallthrough; | |
5470dea4 AD |
166 | case 56: |
167 | _pp[6] = 0; | |
168 | _pp[5] = 0; | |
169 | _pp[4] = 0; | |
170 | _pp[3] = 0; | |
171 | _pp[2] = 0; | |
172 | _pp[1] = 0; | |
173 | _pp[0] = 0; | |
174 | } | |
175 | } | |
176 | #else | |
a4a3ede2 PT |
177 | #define mm_zero_struct_page(pp) ((void)memset((pp), 0, sizeof(struct page))) |
178 | #endif | |
179 | ||
ea606cf5 AR |
180 | /* |
181 | * Default maximum number of active map areas, this limits the number of vmas | |
182 | * per mm struct. Users can overwrite this number by sysctl but there is a | |
183 | * problem. | |
184 | * | |
185 | * When a program's coredump is generated as ELF format, a section is created | |
186 | * per a vma. In ELF, the number of sections is represented in unsigned short. | |
187 | * This means the number of sections should be smaller than 65535 at coredump. | |
188 | * Because the kernel adds some informative sections to a image of program at | |
189 | * generating coredump, we need some margin. The number of extra sections is | |
190 | * 1-3 now and depends on arch. We use "5" as safe margin, here. | |
191 | * | |
192 | * ELF extended numbering allows more than 65535 sections, so 16-bit bound is | |
193 | * not a hard limit any more. Although some userspace tools can be surprised by | |
194 | * that. | |
195 | */ | |
196 | #define MAPCOUNT_ELF_CORE_MARGIN (5) | |
197 | #define DEFAULT_MAX_MAP_COUNT (USHRT_MAX - MAPCOUNT_ELF_CORE_MARGIN) | |
198 | ||
199 | extern int sysctl_max_map_count; | |
200 | ||
c9b1d098 | 201 | extern unsigned long sysctl_user_reserve_kbytes; |
4eeab4f5 | 202 | extern unsigned long sysctl_admin_reserve_kbytes; |
c9b1d098 | 203 | |
49f0ce5f JM |
204 | extern int sysctl_overcommit_memory; |
205 | extern int sysctl_overcommit_ratio; | |
206 | extern unsigned long sysctl_overcommit_kbytes; | |
207 | ||
32927393 CH |
208 | int overcommit_ratio_handler(struct ctl_table *, int, void *, size_t *, |
209 | loff_t *); | |
210 | int overcommit_kbytes_handler(struct ctl_table *, int, void *, size_t *, | |
211 | loff_t *); | |
56f3547b FT |
212 | int overcommit_policy_handler(struct ctl_table *, int, void *, size_t *, |
213 | loff_t *); | |
49f0ce5f | 214 | |
1cfcee72 | 215 | #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP) |
1da177e4 | 216 | #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n)) |
659508f9 | 217 | #define folio_page_idx(folio, p) (page_to_pfn(p) - folio_pfn(folio)) |
1cfcee72 MWO |
218 | #else |
219 | #define nth_page(page,n) ((page) + (n)) | |
659508f9 | 220 | #define folio_page_idx(folio, p) ((p) - &(folio)->page) |
1cfcee72 | 221 | #endif |
1da177e4 | 222 | |
27ac792c AR |
223 | /* to align the pointer to the (next) page boundary */ |
224 | #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE) | |
225 | ||
335e52c2 DG |
226 | /* to align the pointer to the (prev) page boundary */ |
227 | #define PAGE_ALIGN_DOWN(addr) ALIGN_DOWN(addr, PAGE_SIZE) | |
228 | ||
0fa73b86 | 229 | /* test whether an address (unsigned long or pointer) is aligned to PAGE_SIZE */ |
1061b0d2 | 230 | #define PAGE_ALIGNED(addr) IS_ALIGNED((unsigned long)(addr), PAGE_SIZE) |
0fa73b86 | 231 | |
f86196ea | 232 | #define lru_to_page(head) (list_entry((head)->prev, struct page, lru)) |
06d20bdb MWO |
233 | static inline struct folio *lru_to_folio(struct list_head *head) |
234 | { | |
235 | return list_entry((head)->prev, struct folio, lru); | |
236 | } | |
f86196ea | 237 | |
5748fbc5 KW |
238 | void setup_initial_init_mm(void *start_code, void *end_code, |
239 | void *end_data, void *brk); | |
240 | ||
1da177e4 LT |
241 | /* |
242 | * Linux kernel virtual memory manager primitives. | |
243 | * The idea being to have a "virtual" mm in the same way | |
244 | * we have a virtual fs - giving a cleaner interface to the | |
245 | * mm details, and allowing different kinds of memory mappings | |
246 | * (from shared memory to executable loading to arbitrary | |
247 | * mmap() functions). | |
248 | */ | |
249 | ||
490fc053 | 250 | struct vm_area_struct *vm_area_alloc(struct mm_struct *); |
3928d4f5 LT |
251 | struct vm_area_struct *vm_area_dup(struct vm_area_struct *); |
252 | void vm_area_free(struct vm_area_struct *); | |
c43692e8 | 253 | |
1da177e4 | 254 | #ifndef CONFIG_MMU |
8feae131 DH |
255 | extern struct rb_root nommu_region_tree; |
256 | extern struct rw_semaphore nommu_region_sem; | |
1da177e4 LT |
257 | |
258 | extern unsigned int kobjsize(const void *objp); | |
259 | #endif | |
260 | ||
261 | /* | |
605d9288 | 262 | * vm_flags in vm_area_struct, see mm_types.h. |
bcf66917 | 263 | * When changing, update also include/trace/events/mmflags.h |
1da177e4 | 264 | */ |
cc2383ec KK |
265 | #define VM_NONE 0x00000000 |
266 | ||
1da177e4 LT |
267 | #define VM_READ 0x00000001 /* currently active flags */ |
268 | #define VM_WRITE 0x00000002 | |
269 | #define VM_EXEC 0x00000004 | |
270 | #define VM_SHARED 0x00000008 | |
271 | ||
7e2cff42 | 272 | /* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */ |
1da177e4 LT |
273 | #define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */ |
274 | #define VM_MAYWRITE 0x00000020 | |
275 | #define VM_MAYEXEC 0x00000040 | |
276 | #define VM_MAYSHARE 0x00000080 | |
277 | ||
278 | #define VM_GROWSDOWN 0x00000100 /* general info on the segment */ | |
16ba6f81 | 279 | #define VM_UFFD_MISSING 0x00000200 /* missing pages tracking */ |
6aab341e | 280 | #define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */ |
16ba6f81 | 281 | #define VM_UFFD_WP 0x00001000 /* wrprotect pages tracking */ |
1da177e4 | 282 | |
1da177e4 LT |
283 | #define VM_LOCKED 0x00002000 |
284 | #define VM_IO 0x00004000 /* Memory mapped I/O or similar */ | |
285 | ||
286 | /* Used by sys_madvise() */ | |
287 | #define VM_SEQ_READ 0x00008000 /* App will access data sequentially */ | |
288 | #define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */ | |
289 | ||
290 | #define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */ | |
291 | #define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */ | |
de60f5f1 | 292 | #define VM_LOCKONFAULT 0x00080000 /* Lock the pages covered when they are faulted in */ |
1da177e4 | 293 | #define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */ |
cdfd4325 | 294 | #define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */ |
1da177e4 | 295 | #define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */ |
b6fb293f | 296 | #define VM_SYNC 0x00800000 /* Synchronous page faults */ |
cc2383ec | 297 | #define VM_ARCH_1 0x01000000 /* Architecture-specific flag */ |
d2cd9ede | 298 | #define VM_WIPEONFORK 0x02000000 /* Wipe VMA contents in child. */ |
0103bd16 | 299 | #define VM_DONTDUMP 0x04000000 /* Do not include in the core dump */ |
d00806b1 | 300 | |
d9104d1c CG |
301 | #ifdef CONFIG_MEM_SOFT_DIRTY |
302 | # define VM_SOFTDIRTY 0x08000000 /* Not soft dirty clean area */ | |
303 | #else | |
304 | # define VM_SOFTDIRTY 0 | |
305 | #endif | |
306 | ||
b379d790 | 307 | #define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */ |
cc2383ec KK |
308 | #define VM_HUGEPAGE 0x20000000 /* MADV_HUGEPAGE marked this vma */ |
309 | #define VM_NOHUGEPAGE 0x40000000 /* MADV_NOHUGEPAGE marked this vma */ | |
f8af4da3 | 310 | #define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */ |
1da177e4 | 311 | |
63c17fb8 DH |
312 | #ifdef CONFIG_ARCH_USES_HIGH_VMA_FLAGS |
313 | #define VM_HIGH_ARCH_BIT_0 32 /* bit only usable on 64-bit architectures */ | |
314 | #define VM_HIGH_ARCH_BIT_1 33 /* bit only usable on 64-bit architectures */ | |
315 | #define VM_HIGH_ARCH_BIT_2 34 /* bit only usable on 64-bit architectures */ | |
316 | #define VM_HIGH_ARCH_BIT_3 35 /* bit only usable on 64-bit architectures */ | |
df3735c5 | 317 | #define VM_HIGH_ARCH_BIT_4 36 /* bit only usable on 64-bit architectures */ |
63c17fb8 DH |
318 | #define VM_HIGH_ARCH_0 BIT(VM_HIGH_ARCH_BIT_0) |
319 | #define VM_HIGH_ARCH_1 BIT(VM_HIGH_ARCH_BIT_1) | |
320 | #define VM_HIGH_ARCH_2 BIT(VM_HIGH_ARCH_BIT_2) | |
321 | #define VM_HIGH_ARCH_3 BIT(VM_HIGH_ARCH_BIT_3) | |
df3735c5 | 322 | #define VM_HIGH_ARCH_4 BIT(VM_HIGH_ARCH_BIT_4) |
63c17fb8 DH |
323 | #endif /* CONFIG_ARCH_USES_HIGH_VMA_FLAGS */ |
324 | ||
5212213a | 325 | #ifdef CONFIG_ARCH_HAS_PKEYS |
8f62c883 DH |
326 | # define VM_PKEY_SHIFT VM_HIGH_ARCH_BIT_0 |
327 | # define VM_PKEY_BIT0 VM_HIGH_ARCH_0 /* A protection key is a 4-bit value */ | |
2c9e0a6f | 328 | # define VM_PKEY_BIT1 VM_HIGH_ARCH_1 /* on x86 and 5-bit value on ppc64 */ |
8f62c883 DH |
329 | # define VM_PKEY_BIT2 VM_HIGH_ARCH_2 |
330 | # define VM_PKEY_BIT3 VM_HIGH_ARCH_3 | |
2c9e0a6f RP |
331 | #ifdef CONFIG_PPC |
332 | # define VM_PKEY_BIT4 VM_HIGH_ARCH_4 | |
333 | #else | |
334 | # define VM_PKEY_BIT4 0 | |
8f62c883 | 335 | #endif |
5212213a RP |
336 | #endif /* CONFIG_ARCH_HAS_PKEYS */ |
337 | ||
338 | #if defined(CONFIG_X86) | |
339 | # define VM_PAT VM_ARCH_1 /* PAT reserves whole VMA at once (x86) */ | |
12564485 SA |
340 | #elif defined(CONFIG_PPC) |
341 | # define VM_SAO VM_ARCH_1 /* Strong Access Ordering (powerpc) */ | |
cc2383ec KK |
342 | #elif defined(CONFIG_PARISC) |
343 | # define VM_GROWSUP VM_ARCH_1 | |
344 | #elif defined(CONFIG_IA64) | |
345 | # define VM_GROWSUP VM_ARCH_1 | |
74a04967 KA |
346 | #elif defined(CONFIG_SPARC64) |
347 | # define VM_SPARC_ADI VM_ARCH_1 /* Uses ADI tag for access control */ | |
348 | # define VM_ARCH_CLEAR VM_SPARC_ADI | |
8ef8f360 DM |
349 | #elif defined(CONFIG_ARM64) |
350 | # define VM_ARM64_BTI VM_ARCH_1 /* BTI guarded page, a.k.a. GP bit */ | |
351 | # define VM_ARCH_CLEAR VM_ARM64_BTI | |
cc2383ec KK |
352 | #elif !defined(CONFIG_MMU) |
353 | # define VM_MAPPED_COPY VM_ARCH_1 /* T if mapped copy of data (nommu mmap) */ | |
354 | #endif | |
355 | ||
9f341931 CM |
356 | #if defined(CONFIG_ARM64_MTE) |
357 | # define VM_MTE VM_HIGH_ARCH_0 /* Use Tagged memory for access control */ | |
358 | # define VM_MTE_ALLOWED VM_HIGH_ARCH_1 /* Tagged memory permitted */ | |
359 | #else | |
360 | # define VM_MTE VM_NONE | |
361 | # define VM_MTE_ALLOWED VM_NONE | |
362 | #endif | |
363 | ||
cc2383ec KK |
364 | #ifndef VM_GROWSUP |
365 | # define VM_GROWSUP VM_NONE | |
366 | #endif | |
367 | ||
7677f7fd AR |
368 | #ifdef CONFIG_HAVE_ARCH_USERFAULTFD_MINOR |
369 | # define VM_UFFD_MINOR_BIT 37 | |
370 | # define VM_UFFD_MINOR BIT(VM_UFFD_MINOR_BIT) /* UFFD minor faults */ | |
371 | #else /* !CONFIG_HAVE_ARCH_USERFAULTFD_MINOR */ | |
372 | # define VM_UFFD_MINOR VM_NONE | |
373 | #endif /* CONFIG_HAVE_ARCH_USERFAULTFD_MINOR */ | |
374 | ||
a8bef8ff MG |
375 | /* Bits set in the VMA until the stack is in its final location */ |
376 | #define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ) | |
377 | ||
c62da0c3 AK |
378 | #define TASK_EXEC ((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) |
379 | ||
380 | /* Common data flag combinations */ | |
381 | #define VM_DATA_FLAGS_TSK_EXEC (VM_READ | VM_WRITE | TASK_EXEC | \ | |
382 | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) | |
383 | #define VM_DATA_FLAGS_NON_EXEC (VM_READ | VM_WRITE | VM_MAYREAD | \ | |
384 | VM_MAYWRITE | VM_MAYEXEC) | |
385 | #define VM_DATA_FLAGS_EXEC (VM_READ | VM_WRITE | VM_EXEC | \ | |
386 | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) | |
387 | ||
388 | #ifndef VM_DATA_DEFAULT_FLAGS /* arch can override this */ | |
389 | #define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_EXEC | |
390 | #endif | |
391 | ||
1da177e4 LT |
392 | #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */ |
393 | #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS | |
394 | #endif | |
395 | ||
396 | #ifdef CONFIG_STACK_GROWSUP | |
30bdbb78 | 397 | #define VM_STACK VM_GROWSUP |
1da177e4 | 398 | #else |
30bdbb78 | 399 | #define VM_STACK VM_GROWSDOWN |
1da177e4 LT |
400 | #endif |
401 | ||
30bdbb78 KK |
402 | #define VM_STACK_FLAGS (VM_STACK | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT) |
403 | ||
6cb4d9a2 AK |
404 | /* VMA basic access permission flags */ |
405 | #define VM_ACCESS_FLAGS (VM_READ | VM_WRITE | VM_EXEC) | |
406 | ||
407 | ||
b291f000 | 408 | /* |
78f11a25 | 409 | * Special vmas that are non-mergable, non-mlock()able. |
b291f000 | 410 | */ |
9050d7eb | 411 | #define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_PFNMAP | VM_MIXEDMAP) |
b291f000 | 412 | |
b4443772 AK |
413 | /* This mask prevents VMA from being scanned with khugepaged */ |
414 | #define VM_NO_KHUGEPAGED (VM_SPECIAL | VM_HUGETLB) | |
415 | ||
a0715cc2 AT |
416 | /* This mask defines which mm->def_flags a process can inherit its parent */ |
417 | #define VM_INIT_DEF_MASK VM_NOHUGEPAGE | |
418 | ||
de60f5f1 EM |
419 | /* This mask is used to clear all the VMA flags used by mlock */ |
420 | #define VM_LOCKED_CLEAR_MASK (~(VM_LOCKED | VM_LOCKONFAULT)) | |
421 | ||
2c2d57b5 KA |
422 | /* Arch-specific flags to clear when updating VM flags on protection change */ |
423 | #ifndef VM_ARCH_CLEAR | |
424 | # define VM_ARCH_CLEAR VM_NONE | |
425 | #endif | |
426 | #define VM_FLAGS_CLEAR (ARCH_VM_PKEY_FLAGS | VM_ARCH_CLEAR) | |
427 | ||
1da177e4 LT |
428 | /* |
429 | * mapping from the currently active vm_flags protection bits (the | |
430 | * low four bits) to a page protection mask.. | |
431 | */ | |
1da177e4 | 432 | |
dde16072 PX |
433 | /* |
434 | * The default fault flags that should be used by most of the | |
435 | * arch-specific page fault handlers. | |
436 | */ | |
437 | #define FAULT_FLAG_DEFAULT (FAULT_FLAG_ALLOW_RETRY | \ | |
c270a7ee PX |
438 | FAULT_FLAG_KILLABLE | \ |
439 | FAULT_FLAG_INTERRUPTIBLE) | |
dde16072 | 440 | |
4064b982 PX |
441 | /** |
442 | * fault_flag_allow_retry_first - check ALLOW_RETRY the first time | |
78f4841e | 443 | * @flags: Fault flags. |
4064b982 PX |
444 | * |
445 | * This is mostly used for places where we want to try to avoid taking | |
c1e8d7c6 | 446 | * the mmap_lock for too long a time when waiting for another condition |
4064b982 | 447 | * to change, in which case we can try to be polite to release the |
c1e8d7c6 ML |
448 | * mmap_lock in the first round to avoid potential starvation of other |
449 | * processes that would also want the mmap_lock. | |
4064b982 PX |
450 | * |
451 | * Return: true if the page fault allows retry and this is the first | |
452 | * attempt of the fault handling; false otherwise. | |
453 | */ | |
da2f5eb3 | 454 | static inline bool fault_flag_allow_retry_first(enum fault_flag flags) |
4064b982 PX |
455 | { |
456 | return (flags & FAULT_FLAG_ALLOW_RETRY) && | |
457 | (!(flags & FAULT_FLAG_TRIED)); | |
458 | } | |
459 | ||
282a8e03 RZ |
460 | #define FAULT_FLAG_TRACE \ |
461 | { FAULT_FLAG_WRITE, "WRITE" }, \ | |
462 | { FAULT_FLAG_MKWRITE, "MKWRITE" }, \ | |
463 | { FAULT_FLAG_ALLOW_RETRY, "ALLOW_RETRY" }, \ | |
464 | { FAULT_FLAG_RETRY_NOWAIT, "RETRY_NOWAIT" }, \ | |
465 | { FAULT_FLAG_KILLABLE, "KILLABLE" }, \ | |
466 | { FAULT_FLAG_TRIED, "TRIED" }, \ | |
467 | { FAULT_FLAG_USER, "USER" }, \ | |
468 | { FAULT_FLAG_REMOTE, "REMOTE" }, \ | |
c270a7ee PX |
469 | { FAULT_FLAG_INSTRUCTION, "INSTRUCTION" }, \ |
470 | { FAULT_FLAG_INTERRUPTIBLE, "INTERRUPTIBLE" } | |
282a8e03 | 471 | |
54cb8821 | 472 | /* |
11192337 | 473 | * vm_fault is filled by the pagefault handler and passed to the vma's |
83c54070 NP |
474 | * ->fault function. The vma's ->fault is responsible for returning a bitmask |
475 | * of VM_FAULT_xxx flags that give details about how the fault was handled. | |
54cb8821 | 476 | * |
c20cd45e MH |
477 | * MM layer fills up gfp_mask for page allocations but fault handler might |
478 | * alter it if its implementation requires a different allocation context. | |
479 | * | |
9b4bdd2f | 480 | * pgoff should be used in favour of virtual_address, if possible. |
54cb8821 | 481 | */ |
d0217ac0 | 482 | struct vm_fault { |
5857c920 | 483 | const struct { |
742d3372 WD |
484 | struct vm_area_struct *vma; /* Target VMA */ |
485 | gfp_t gfp_mask; /* gfp mask to be used for allocations */ | |
486 | pgoff_t pgoff; /* Logical page offset based on vma */ | |
824ddc60 NA |
487 | unsigned long address; /* Faulting virtual address - masked */ |
488 | unsigned long real_address; /* Faulting virtual address - unmasked */ | |
742d3372 | 489 | }; |
da2f5eb3 | 490 | enum fault_flag flags; /* FAULT_FLAG_xxx flags |
742d3372 | 491 | * XXX: should really be 'const' */ |
82b0f8c3 | 492 | pmd_t *pmd; /* Pointer to pmd entry matching |
2994302b | 493 | * the 'address' */ |
a2d58167 DJ |
494 | pud_t *pud; /* Pointer to pud entry matching |
495 | * the 'address' | |
496 | */ | |
5db4f15c YS |
497 | union { |
498 | pte_t orig_pte; /* Value of PTE at the time of fault */ | |
499 | pmd_t orig_pmd; /* Value of PMD at the time of fault, | |
500 | * used by PMD fault only. | |
501 | */ | |
502 | }; | |
d0217ac0 | 503 | |
3917048d | 504 | struct page *cow_page; /* Page handler may use for COW fault */ |
d0217ac0 | 505 | struct page *page; /* ->fault handlers should return a |
83c54070 | 506 | * page here, unless VM_FAULT_NOPAGE |
d0217ac0 | 507 | * is set (which is also implied by |
83c54070 | 508 | * VM_FAULT_ERROR). |
d0217ac0 | 509 | */ |
82b0f8c3 | 510 | /* These three entries are valid only while holding ptl lock */ |
bae473a4 KS |
511 | pte_t *pte; /* Pointer to pte entry matching |
512 | * the 'address'. NULL if the page | |
513 | * table hasn't been allocated. | |
514 | */ | |
515 | spinlock_t *ptl; /* Page table lock. | |
516 | * Protects pte page table if 'pte' | |
517 | * is not NULL, otherwise pmd. | |
518 | */ | |
7267ec00 | 519 | pgtable_t prealloc_pte; /* Pre-allocated pte page table. |
f9ce0be7 KS |
520 | * vm_ops->map_pages() sets up a page |
521 | * table from atomic context. | |
7267ec00 KS |
522 | * do_fault_around() pre-allocates |
523 | * page table to avoid allocation from | |
524 | * atomic context. | |
525 | */ | |
54cb8821 | 526 | }; |
1da177e4 | 527 | |
c791ace1 DJ |
528 | /* page entry size for vm->huge_fault() */ |
529 | enum page_entry_size { | |
530 | PE_SIZE_PTE = 0, | |
531 | PE_SIZE_PMD, | |
532 | PE_SIZE_PUD, | |
533 | }; | |
534 | ||
1da177e4 LT |
535 | /* |
536 | * These are the virtual MM functions - opening of an area, closing and | |
537 | * unmapping it (needed to keep files on disk up-to-date etc), pointer | |
27d036e3 | 538 | * to the functions called when a no-page or a wp-page exception occurs. |
1da177e4 LT |
539 | */ |
540 | struct vm_operations_struct { | |
541 | void (*open)(struct vm_area_struct * area); | |
cc6dcfee SB |
542 | /** |
543 | * @close: Called when the VMA is being removed from the MM. | |
544 | * Context: User context. May sleep. Caller holds mmap_lock. | |
545 | */ | |
1da177e4 | 546 | void (*close)(struct vm_area_struct * area); |
dd3b614f DS |
547 | /* Called any time before splitting to check if it's allowed */ |
548 | int (*may_split)(struct vm_area_struct *area, unsigned long addr); | |
14d07113 | 549 | int (*mremap)(struct vm_area_struct *area); |
95bb7c42 SC |
550 | /* |
551 | * Called by mprotect() to make driver-specific permission | |
552 | * checks before mprotect() is finalised. The VMA must not | |
3e0ee843 | 553 | * be modified. Returns 0 if mprotect() can proceed. |
95bb7c42 SC |
554 | */ |
555 | int (*mprotect)(struct vm_area_struct *vma, unsigned long start, | |
556 | unsigned long end, unsigned long newflags); | |
1c8f4220 SJ |
557 | vm_fault_t (*fault)(struct vm_fault *vmf); |
558 | vm_fault_t (*huge_fault)(struct vm_fault *vmf, | |
559 | enum page_entry_size pe_size); | |
f9ce0be7 | 560 | vm_fault_t (*map_pages)(struct vm_fault *vmf, |
bae473a4 | 561 | pgoff_t start_pgoff, pgoff_t end_pgoff); |
05ea8860 | 562 | unsigned long (*pagesize)(struct vm_area_struct * area); |
9637a5ef DH |
563 | |
564 | /* notification that a previously read-only page is about to become | |
565 | * writable, if an error is returned it will cause a SIGBUS */ | |
1c8f4220 | 566 | vm_fault_t (*page_mkwrite)(struct vm_fault *vmf); |
28b2ee20 | 567 | |
dd906184 | 568 | /* same as page_mkwrite when using VM_PFNMAP|VM_MIXEDMAP */ |
1c8f4220 | 569 | vm_fault_t (*pfn_mkwrite)(struct vm_fault *vmf); |
dd906184 | 570 | |
28b2ee20 | 571 | /* called by access_process_vm when get_user_pages() fails, typically |
96667f8a DV |
572 | * for use by special VMAs. See also generic_access_phys() for a generic |
573 | * implementation useful for any iomem mapping. | |
28b2ee20 RR |
574 | */ |
575 | int (*access)(struct vm_area_struct *vma, unsigned long addr, | |
576 | void *buf, int len, int write); | |
78d683e8 AL |
577 | |
578 | /* Called by the /proc/PID/maps code to ask the vma whether it | |
579 | * has a special name. Returning non-NULL will also cause this | |
580 | * vma to be dumped unconditionally. */ | |
581 | const char *(*name)(struct vm_area_struct *vma); | |
582 | ||
1da177e4 | 583 | #ifdef CONFIG_NUMA |
a6020ed7 LS |
584 | /* |
585 | * set_policy() op must add a reference to any non-NULL @new mempolicy | |
586 | * to hold the policy upon return. Caller should pass NULL @new to | |
587 | * remove a policy and fall back to surrounding context--i.e. do not | |
588 | * install a MPOL_DEFAULT policy, nor the task or system default | |
589 | * mempolicy. | |
590 | */ | |
1da177e4 | 591 | int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new); |
a6020ed7 LS |
592 | |
593 | /* | |
594 | * get_policy() op must add reference [mpol_get()] to any policy at | |
595 | * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure | |
596 | * in mm/mempolicy.c will do this automatically. | |
597 | * get_policy() must NOT add a ref if the policy at (vma,addr) is not | |
c1e8d7c6 | 598 | * marked as MPOL_SHARED. vma policies are protected by the mmap_lock. |
a6020ed7 LS |
599 | * If no [shared/vma] mempolicy exists at the addr, get_policy() op |
600 | * must return NULL--i.e., do not "fallback" to task or system default | |
601 | * policy. | |
602 | */ | |
1da177e4 LT |
603 | struct mempolicy *(*get_policy)(struct vm_area_struct *vma, |
604 | unsigned long addr); | |
605 | #endif | |
667a0a06 DV |
606 | /* |
607 | * Called by vm_normal_page() for special PTEs to find the | |
608 | * page for @addr. This is useful if the default behavior | |
609 | * (using pte_page()) would not find the correct page. | |
610 | */ | |
611 | struct page *(*find_special_page)(struct vm_area_struct *vma, | |
612 | unsigned long addr); | |
1da177e4 LT |
613 | }; |
614 | ||
027232da KS |
615 | static inline void vma_init(struct vm_area_struct *vma, struct mm_struct *mm) |
616 | { | |
bfd40eaf KS |
617 | static const struct vm_operations_struct dummy_vm_ops = {}; |
618 | ||
a670468f | 619 | memset(vma, 0, sizeof(*vma)); |
027232da | 620 | vma->vm_mm = mm; |
bfd40eaf | 621 | vma->vm_ops = &dummy_vm_ops; |
027232da KS |
622 | INIT_LIST_HEAD(&vma->anon_vma_chain); |
623 | } | |
624 | ||
bfd40eaf KS |
625 | static inline void vma_set_anonymous(struct vm_area_struct *vma) |
626 | { | |
627 | vma->vm_ops = NULL; | |
628 | } | |
629 | ||
43675e6f YS |
630 | static inline bool vma_is_anonymous(struct vm_area_struct *vma) |
631 | { | |
632 | return !vma->vm_ops; | |
633 | } | |
634 | ||
222100ee AK |
635 | static inline bool vma_is_temporary_stack(struct vm_area_struct *vma) |
636 | { | |
637 | int maybe_stack = vma->vm_flags & (VM_GROWSDOWN | VM_GROWSUP); | |
638 | ||
639 | if (!maybe_stack) | |
640 | return false; | |
641 | ||
642 | if ((vma->vm_flags & VM_STACK_INCOMPLETE_SETUP) == | |
643 | VM_STACK_INCOMPLETE_SETUP) | |
644 | return true; | |
645 | ||
646 | return false; | |
647 | } | |
648 | ||
7969f226 AK |
649 | static inline bool vma_is_foreign(struct vm_area_struct *vma) |
650 | { | |
651 | if (!current->mm) | |
652 | return true; | |
653 | ||
654 | if (current->mm != vma->vm_mm) | |
655 | return true; | |
656 | ||
657 | return false; | |
658 | } | |
3122e80e AK |
659 | |
660 | static inline bool vma_is_accessible(struct vm_area_struct *vma) | |
661 | { | |
6cb4d9a2 | 662 | return vma->vm_flags & VM_ACCESS_FLAGS; |
3122e80e AK |
663 | } |
664 | ||
f39af059 MWO |
665 | static inline |
666 | struct vm_area_struct *vma_find(struct vma_iterator *vmi, unsigned long max) | |
667 | { | |
668 | return mas_find(&vmi->mas, max); | |
669 | } | |
670 | ||
671 | static inline struct vm_area_struct *vma_next(struct vma_iterator *vmi) | |
672 | { | |
673 | /* | |
674 | * Uses vma_find() to get the first VMA when the iterator starts. | |
675 | * Calling mas_next() could skip the first entry. | |
676 | */ | |
677 | return vma_find(vmi, ULONG_MAX); | |
678 | } | |
679 | ||
680 | static inline struct vm_area_struct *vma_prev(struct vma_iterator *vmi) | |
681 | { | |
682 | return mas_prev(&vmi->mas, 0); | |
683 | } | |
684 | ||
685 | static inline unsigned long vma_iter_addr(struct vma_iterator *vmi) | |
686 | { | |
687 | return vmi->mas.index; | |
688 | } | |
689 | ||
690 | #define for_each_vma(__vmi, __vma) \ | |
691 | while (((__vma) = vma_next(&(__vmi))) != NULL) | |
692 | ||
693 | /* The MM code likes to work with exclusive end addresses */ | |
694 | #define for_each_vma_range(__vmi, __vma, __end) \ | |
695 | while (((__vma) = vma_find(&(__vmi), (__end) - 1)) != NULL) | |
696 | ||
43675e6f YS |
697 | #ifdef CONFIG_SHMEM |
698 | /* | |
699 | * The vma_is_shmem is not inline because it is used only by slow | |
700 | * paths in userfault. | |
701 | */ | |
702 | bool vma_is_shmem(struct vm_area_struct *vma); | |
d09e8ca6 | 703 | bool vma_is_anon_shmem(struct vm_area_struct *vma); |
43675e6f YS |
704 | #else |
705 | static inline bool vma_is_shmem(struct vm_area_struct *vma) { return false; } | |
d09e8ca6 | 706 | static inline bool vma_is_anon_shmem(struct vm_area_struct *vma) { return false; } |
43675e6f YS |
707 | #endif |
708 | ||
709 | int vma_is_stack_for_current(struct vm_area_struct *vma); | |
710 | ||
8b11ec1b LT |
711 | /* flush_tlb_range() takes a vma, not a mm, and can care about flags */ |
712 | #define TLB_FLUSH_VMA(mm,flags) { .vm_mm = (mm), .vm_flags = (flags) } | |
713 | ||
1da177e4 LT |
714 | struct mmu_gather; |
715 | struct inode; | |
716 | ||
5bf34d7c MWO |
717 | static inline unsigned int compound_order(struct page *page) |
718 | { | |
719 | if (!PageHead(page)) | |
720 | return 0; | |
721 | return page[1].compound_order; | |
722 | } | |
723 | ||
724 | /** | |
725 | * folio_order - The allocation order of a folio. | |
726 | * @folio: The folio. | |
727 | * | |
728 | * A folio is composed of 2^order pages. See get_order() for the definition | |
729 | * of order. | |
730 | * | |
731 | * Return: The order of the folio. | |
732 | */ | |
733 | static inline unsigned int folio_order(struct folio *folio) | |
734 | { | |
c3a15bff MWO |
735 | if (!folio_test_large(folio)) |
736 | return 0; | |
737 | return folio->_folio_order; | |
5bf34d7c MWO |
738 | } |
739 | ||
71e3aac0 | 740 | #include <linux/huge_mm.h> |
1da177e4 LT |
741 | |
742 | /* | |
743 | * Methods to modify the page usage count. | |
744 | * | |
745 | * What counts for a page usage: | |
746 | * - cache mapping (page->mapping) | |
747 | * - private data (page->private) | |
748 | * - page mapped in a task's page tables, each mapping | |
749 | * is counted separately | |
750 | * | |
751 | * Also, many kernel routines increase the page count before a critical | |
752 | * routine so they can be sure the page doesn't go away from under them. | |
1da177e4 LT |
753 | */ |
754 | ||
755 | /* | |
da6052f7 | 756 | * Drop a ref, return true if the refcount fell to zero (the page has no users) |
1da177e4 | 757 | */ |
7c8ee9a8 NP |
758 | static inline int put_page_testzero(struct page *page) |
759 | { | |
fe896d18 JK |
760 | VM_BUG_ON_PAGE(page_ref_count(page) == 0, page); |
761 | return page_ref_dec_and_test(page); | |
7c8ee9a8 | 762 | } |
1da177e4 | 763 | |
b620f633 MWO |
764 | static inline int folio_put_testzero(struct folio *folio) |
765 | { | |
766 | return put_page_testzero(&folio->page); | |
767 | } | |
768 | ||
1da177e4 | 769 | /* |
7c8ee9a8 NP |
770 | * Try to grab a ref unless the page has a refcount of zero, return false if |
771 | * that is the case. | |
8e0861fa AK |
772 | * This can be called when MMU is off so it must not access |
773 | * any of the virtual mappings. | |
1da177e4 | 774 | */ |
c2530328 | 775 | static inline bool get_page_unless_zero(struct page *page) |
7c8ee9a8 | 776 | { |
fe896d18 | 777 | return page_ref_add_unless(page, 1, 0); |
7c8ee9a8 | 778 | } |
1da177e4 | 779 | |
53df8fdc | 780 | extern int page_is_ram(unsigned long pfn); |
124fe20d DW |
781 | |
782 | enum { | |
783 | REGION_INTERSECTS, | |
784 | REGION_DISJOINT, | |
785 | REGION_MIXED, | |
786 | }; | |
787 | ||
1c29f25b TK |
788 | int region_intersects(resource_size_t offset, size_t size, unsigned long flags, |
789 | unsigned long desc); | |
53df8fdc | 790 | |
48667e7a | 791 | /* Support for virtually mapped pages */ |
b3bdda02 CL |
792 | struct page *vmalloc_to_page(const void *addr); |
793 | unsigned long vmalloc_to_pfn(const void *addr); | |
48667e7a | 794 | |
0738c4bb PM |
795 | /* |
796 | * Determine if an address is within the vmalloc range | |
797 | * | |
798 | * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there | |
799 | * is no special casing required. | |
800 | */ | |
9bd3bb67 AK |
801 | |
802 | #ifndef is_ioremap_addr | |
803 | #define is_ioremap_addr(x) is_vmalloc_addr(x) | |
804 | #endif | |
805 | ||
81ac3ad9 | 806 | #ifdef CONFIG_MMU |
186525bd | 807 | extern bool is_vmalloc_addr(const void *x); |
81ac3ad9 KH |
808 | extern int is_vmalloc_or_module_addr(const void *x); |
809 | #else | |
186525bd IM |
810 | static inline bool is_vmalloc_addr(const void *x) |
811 | { | |
812 | return false; | |
813 | } | |
934831d0 | 814 | static inline int is_vmalloc_or_module_addr(const void *x) |
81ac3ad9 KH |
815 | { |
816 | return 0; | |
817 | } | |
818 | #endif | |
9e2779fa | 819 | |
74e8ee47 MWO |
820 | /* |
821 | * How many times the entire folio is mapped as a single unit (eg by a | |
822 | * PMD or PUD entry). This is probably not what you want, except for | |
cb67f428 HD |
823 | * debugging purposes - it does not include PTE-mapped sub-pages; look |
824 | * at folio_mapcount() or page_mapcount() or total_mapcount() instead. | |
74e8ee47 MWO |
825 | */ |
826 | static inline int folio_entire_mapcount(struct folio *folio) | |
6dc5ea16 | 827 | { |
74e8ee47 MWO |
828 | VM_BUG_ON_FOLIO(!folio_test_large(folio), folio); |
829 | return atomic_read(folio_mapcount_ptr(folio)) + 1; | |
6dc5ea16 JH |
830 | } |
831 | ||
6988f31d KK |
832 | /* |
833 | * Mapcount of compound page as a whole, does not include mapped sub-pages. | |
cb67f428 | 834 | * Must be called only on head of compound page. |
6988f31d | 835 | */ |
cb67f428 | 836 | static inline int head_compound_mapcount(struct page *head) |
53f9263b | 837 | { |
cb67f428 HD |
838 | return atomic_read(compound_mapcount_ptr(head)) + 1; |
839 | } | |
840 | ||
4b51634c HD |
841 | /* |
842 | * If a 16GB hugetlb page were mapped by PTEs of all of its 4kB sub-pages, | |
843 | * its subpages_mapcount would be 0x400000: choose the COMPOUND_MAPPED bit | |
844 | * above that range, instead of 2*(PMD_SIZE/PAGE_SIZE). Hugetlb currently | |
845 | * leaves subpages_mapcount at 0, but avoid surprise if it participates later. | |
846 | */ | |
847 | #define COMPOUND_MAPPED 0x800000 | |
848 | #define SUBPAGES_MAPPED (COMPOUND_MAPPED - 1) | |
849 | ||
cb67f428 | 850 | /* |
be5ef2d9 | 851 | * Number of sub-pages mapped by PTE, does not include compound mapcount. |
cb67f428 HD |
852 | * Must be called only on head of compound page. |
853 | */ | |
854 | static inline int head_subpages_mapcount(struct page *head) | |
855 | { | |
4b51634c | 856 | return atomic_read(subpages_mapcount_ptr(head)) & SUBPAGES_MAPPED; |
53f9263b KS |
857 | } |
858 | ||
70b50f94 AA |
859 | /* |
860 | * The atomic page->_mapcount, starts from -1: so that transitions | |
861 | * both from it and to it can be tracked, using atomic_inc_and_test | |
862 | * and atomic_add_negative(-1). | |
863 | */ | |
22b751c3 | 864 | static inline void page_mapcount_reset(struct page *page) |
70b50f94 AA |
865 | { |
866 | atomic_set(&(page)->_mapcount, -1); | |
867 | } | |
868 | ||
6988f31d KK |
869 | /* |
870 | * Mapcount of 0-order page; when compound sub-page, includes | |
cb67f428 | 871 | * compound_mapcount of compound_head of page. |
6988f31d KK |
872 | * |
873 | * Result is undefined for pages which cannot be mapped into userspace. | |
874 | * For example SLAB or special types of pages. See function page_has_type(). | |
875 | * They use this place in struct page differently. | |
876 | */ | |
70b50f94 AA |
877 | static inline int page_mapcount(struct page *page) |
878 | { | |
cb67f428 | 879 | int mapcount = atomic_read(&page->_mapcount) + 1; |
b20ce5e0 | 880 | |
cb67f428 HD |
881 | if (likely(!PageCompound(page))) |
882 | return mapcount; | |
883 | page = compound_head(page); | |
884 | return head_compound_mapcount(page) + mapcount; | |
885 | } | |
4ba1119c | 886 | |
be5ef2d9 | 887 | int total_compound_mapcount(struct page *head); |
cb67f428 HD |
888 | |
889 | /** | |
890 | * folio_mapcount() - Calculate the number of mappings of this folio. | |
891 | * @folio: The folio. | |
892 | * | |
893 | * A large folio tracks both how many times the entire folio is mapped, | |
894 | * and how many times each individual page in the folio is mapped. | |
895 | * This function calculates the total number of times the folio is | |
896 | * mapped. | |
897 | * | |
898 | * Return: The number of times this folio is mapped. | |
899 | */ | |
900 | static inline int folio_mapcount(struct folio *folio) | |
901 | { | |
902 | if (likely(!folio_test_large(folio))) | |
903 | return atomic_read(&folio->_mapcount) + 1; | |
be5ef2d9 HD |
904 | return total_compound_mapcount(&folio->page); |
905 | } | |
906 | ||
907 | static inline int total_mapcount(struct page *page) | |
908 | { | |
909 | if (likely(!PageCompound(page))) | |
910 | return atomic_read(&page->_mapcount) + 1; | |
911 | return total_compound_mapcount(compound_head(page)); | |
912 | } | |
913 | ||
914 | static inline bool folio_large_is_mapped(struct folio *folio) | |
915 | { | |
4b51634c HD |
916 | /* |
917 | * Reading folio_mapcount_ptr() below could be omitted if hugetlb | |
918 | * participated in incrementing subpages_mapcount when compound mapped. | |
919 | */ | |
920 | return atomic_read(folio_subpages_mapcount_ptr(folio)) > 0 || | |
921 | atomic_read(folio_mapcount_ptr(folio)) >= 0; | |
cb67f428 HD |
922 | } |
923 | ||
924 | /** | |
925 | * folio_mapped - Is this folio mapped into userspace? | |
926 | * @folio: The folio. | |
927 | * | |
928 | * Return: True if any page in this folio is referenced by user page tables. | |
929 | */ | |
930 | static inline bool folio_mapped(struct folio *folio) | |
931 | { | |
be5ef2d9 HD |
932 | if (likely(!folio_test_large(folio))) |
933 | return atomic_read(&folio->_mapcount) >= 0; | |
934 | return folio_large_is_mapped(folio); | |
935 | } | |
936 | ||
937 | /* | |
938 | * Return true if this page is mapped into pagetables. | |
939 | * For compound page it returns true if any sub-page of compound page is mapped, | |
940 | * even if this particular sub-page is not itself mapped by any PTE or PMD. | |
941 | */ | |
942 | static inline bool page_mapped(struct page *page) | |
943 | { | |
944 | if (likely(!PageCompound(page))) | |
945 | return atomic_read(&page->_mapcount) >= 0; | |
946 | return folio_large_is_mapped(page_folio(page)); | |
70b50f94 AA |
947 | } |
948 | ||
b49af68f CL |
949 | static inline struct page *virt_to_head_page(const void *x) |
950 | { | |
951 | struct page *page = virt_to_page(x); | |
ccaafd7f | 952 | |
1d798ca3 | 953 | return compound_head(page); |
b49af68f CL |
954 | } |
955 | ||
7d4203c1 VB |
956 | static inline struct folio *virt_to_folio(const void *x) |
957 | { | |
958 | struct page *page = virt_to_page(x); | |
959 | ||
960 | return page_folio(page); | |
961 | } | |
962 | ||
8d29c703 | 963 | void __folio_put(struct folio *folio); |
ddc58f27 | 964 | |
1d7ea732 | 965 | void put_pages_list(struct list_head *pages); |
1da177e4 | 966 | |
8dfcc9ba | 967 | void split_page(struct page *page, unsigned int order); |
715cbfd6 | 968 | void folio_copy(struct folio *dst, struct folio *src); |
8dfcc9ba | 969 | |
a1554c00 ML |
970 | unsigned long nr_free_buffer_pages(void); |
971 | ||
33f2ef89 AW |
972 | /* |
973 | * Compound pages have a destructor function. Provide a | |
974 | * prototype for that function and accessor functions. | |
f1e61557 | 975 | * These are _only_ valid on the head of a compound page. |
33f2ef89 | 976 | */ |
f1e61557 KS |
977 | typedef void compound_page_dtor(struct page *); |
978 | ||
979 | /* Keep the enum in sync with compound_page_dtors array in mm/page_alloc.c */ | |
980 | enum compound_dtor_id { | |
981 | NULL_COMPOUND_DTOR, | |
982 | COMPOUND_PAGE_DTOR, | |
983 | #ifdef CONFIG_HUGETLB_PAGE | |
984 | HUGETLB_PAGE_DTOR, | |
9a982250 KS |
985 | #endif |
986 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
987 | TRANSHUGE_PAGE_DTOR, | |
f1e61557 KS |
988 | #endif |
989 | NR_COMPOUND_DTORS, | |
990 | }; | |
ae70eddd | 991 | extern compound_page_dtor * const compound_page_dtors[NR_COMPOUND_DTORS]; |
33f2ef89 AW |
992 | |
993 | static inline void set_compound_page_dtor(struct page *page, | |
f1e61557 | 994 | enum compound_dtor_id compound_dtor) |
33f2ef89 | 995 | { |
f1e61557 KS |
996 | VM_BUG_ON_PAGE(compound_dtor >= NR_COMPOUND_DTORS, page); |
997 | page[1].compound_dtor = compound_dtor; | |
33f2ef89 AW |
998 | } |
999 | ||
5375336c | 1000 | void destroy_large_folio(struct folio *folio); |
33f2ef89 | 1001 | |
bac3cf4d | 1002 | static inline int head_compound_pincount(struct page *head) |
6dc5ea16 JH |
1003 | { |
1004 | return atomic_read(compound_pincount_ptr(head)); | |
1005 | } | |
1006 | ||
f1e61557 | 1007 | static inline void set_compound_order(struct page *page, unsigned int order) |
d85f3385 | 1008 | { |
e4b294c2 | 1009 | page[1].compound_order = order; |
5232c63f | 1010 | #ifdef CONFIG_64BIT |
1378a5ee | 1011 | page[1].compound_nr = 1U << order; |
5232c63f | 1012 | #endif |
d85f3385 CL |
1013 | } |
1014 | ||
d8c6546b MWO |
1015 | /* Returns the number of pages in this potentially compound page. */ |
1016 | static inline unsigned long compound_nr(struct page *page) | |
1017 | { | |
1378a5ee MWO |
1018 | if (!PageHead(page)) |
1019 | return 1; | |
5232c63f | 1020 | #ifdef CONFIG_64BIT |
1378a5ee | 1021 | return page[1].compound_nr; |
5232c63f MWO |
1022 | #else |
1023 | return 1UL << compound_order(page); | |
1024 | #endif | |
d8c6546b MWO |
1025 | } |
1026 | ||
a50b854e MWO |
1027 | /* Returns the number of bytes in this potentially compound page. */ |
1028 | static inline unsigned long page_size(struct page *page) | |
1029 | { | |
1030 | return PAGE_SIZE << compound_order(page); | |
1031 | } | |
1032 | ||
94ad9338 MWO |
1033 | /* Returns the number of bits needed for the number of bytes in a page */ |
1034 | static inline unsigned int page_shift(struct page *page) | |
1035 | { | |
1036 | return PAGE_SHIFT + compound_order(page); | |
1037 | } | |
1038 | ||
18788cfa MWO |
1039 | /** |
1040 | * thp_order - Order of a transparent huge page. | |
1041 | * @page: Head page of a transparent huge page. | |
1042 | */ | |
1043 | static inline unsigned int thp_order(struct page *page) | |
1044 | { | |
1045 | VM_BUG_ON_PGFLAGS(PageTail(page), page); | |
1046 | return compound_order(page); | |
1047 | } | |
1048 | ||
1049 | /** | |
1050 | * thp_nr_pages - The number of regular pages in this huge page. | |
1051 | * @page: The head page of a huge page. | |
1052 | */ | |
1053 | static inline int thp_nr_pages(struct page *page) | |
1054 | { | |
1055 | VM_BUG_ON_PGFLAGS(PageTail(page), page); | |
1056 | return compound_nr(page); | |
1057 | } | |
1058 | ||
1059 | /** | |
1060 | * thp_size - Size of a transparent huge page. | |
1061 | * @page: Head page of a transparent huge page. | |
1062 | * | |
1063 | * Return: Number of bytes in this page. | |
1064 | */ | |
1065 | static inline unsigned long thp_size(struct page *page) | |
1066 | { | |
1067 | return PAGE_SIZE << thp_order(page); | |
1068 | } | |
1069 | ||
9a982250 KS |
1070 | void free_compound_page(struct page *page); |
1071 | ||
3dece370 | 1072 | #ifdef CONFIG_MMU |
14fd403f AA |
1073 | /* |
1074 | * Do pte_mkwrite, but only if the vma says VM_WRITE. We do this when | |
1075 | * servicing faults for write access. In the normal case, do always want | |
1076 | * pte_mkwrite. But get_user_pages can cause write faults for mappings | |
1077 | * that do not have writing enabled, when used by access_process_vm. | |
1078 | */ | |
1079 | static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma) | |
1080 | { | |
1081 | if (likely(vma->vm_flags & VM_WRITE)) | |
1082 | pte = pte_mkwrite(pte); | |
1083 | return pte; | |
1084 | } | |
8c6e50b0 | 1085 | |
f9ce0be7 | 1086 | vm_fault_t do_set_pmd(struct vm_fault *vmf, struct page *page); |
9d3af4b4 | 1087 | void do_set_pte(struct vm_fault *vmf, struct page *page, unsigned long addr); |
f9ce0be7 | 1088 | |
2b740303 SJ |
1089 | vm_fault_t finish_fault(struct vm_fault *vmf); |
1090 | vm_fault_t finish_mkwrite_fault(struct vm_fault *vmf); | |
3dece370 | 1091 | #endif |
14fd403f | 1092 | |
1da177e4 LT |
1093 | /* |
1094 | * Multiple processes may "see" the same page. E.g. for untouched | |
1095 | * mappings of /dev/null, all processes see the same page full of | |
1096 | * zeroes, and text pages of executables and shared libraries have | |
1097 | * only one copy in memory, at most, normally. | |
1098 | * | |
1099 | * For the non-reserved pages, page_count(page) denotes a reference count. | |
7e871b6c PBG |
1100 | * page_count() == 0 means the page is free. page->lru is then used for |
1101 | * freelist management in the buddy allocator. | |
da6052f7 | 1102 | * page_count() > 0 means the page has been allocated. |
1da177e4 | 1103 | * |
da6052f7 NP |
1104 | * Pages are allocated by the slab allocator in order to provide memory |
1105 | * to kmalloc and kmem_cache_alloc. In this case, the management of the | |
1106 | * page, and the fields in 'struct page' are the responsibility of mm/slab.c | |
1107 | * unless a particular usage is carefully commented. (the responsibility of | |
1108 | * freeing the kmalloc memory is the caller's, of course). | |
1da177e4 | 1109 | * |
da6052f7 NP |
1110 | * A page may be used by anyone else who does a __get_free_page(). |
1111 | * In this case, page_count still tracks the references, and should only | |
1112 | * be used through the normal accessor functions. The top bits of page->flags | |
1113 | * and page->virtual store page management information, but all other fields | |
1114 | * are unused and could be used privately, carefully. The management of this | |
1115 | * page is the responsibility of the one who allocated it, and those who have | |
1116 | * subsequently been given references to it. | |
1117 | * | |
1118 | * The other pages (we may call them "pagecache pages") are completely | |
1da177e4 LT |
1119 | * managed by the Linux memory manager: I/O, buffers, swapping etc. |
1120 | * The following discussion applies only to them. | |
1121 | * | |
da6052f7 NP |
1122 | * A pagecache page contains an opaque `private' member, which belongs to the |
1123 | * page's address_space. Usually, this is the address of a circular list of | |
1124 | * the page's disk buffers. PG_private must be set to tell the VM to call | |
1125 | * into the filesystem to release these pages. | |
1da177e4 | 1126 | * |
da6052f7 NP |
1127 | * A page may belong to an inode's memory mapping. In this case, page->mapping |
1128 | * is the pointer to the inode, and page->index is the file offset of the page, | |
ea1754a0 | 1129 | * in units of PAGE_SIZE. |
1da177e4 | 1130 | * |
da6052f7 NP |
1131 | * If pagecache pages are not associated with an inode, they are said to be |
1132 | * anonymous pages. These may become associated with the swapcache, and in that | |
1133 | * case PG_swapcache is set, and page->private is an offset into the swapcache. | |
1da177e4 | 1134 | * |
da6052f7 NP |
1135 | * In either case (swapcache or inode backed), the pagecache itself holds one |
1136 | * reference to the page. Setting PG_private should also increment the | |
1137 | * refcount. The each user mapping also has a reference to the page. | |
1da177e4 | 1138 | * |
da6052f7 | 1139 | * The pagecache pages are stored in a per-mapping radix tree, which is |
b93b0163 | 1140 | * rooted at mapping->i_pages, and indexed by offset. |
da6052f7 NP |
1141 | * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space |
1142 | * lists, we instead now tag pages as dirty/writeback in the radix tree. | |
1da177e4 | 1143 | * |
da6052f7 | 1144 | * All pagecache pages may be subject to I/O: |
1da177e4 LT |
1145 | * - inode pages may need to be read from disk, |
1146 | * - inode pages which have been modified and are MAP_SHARED may need | |
da6052f7 NP |
1147 | * to be written back to the inode on disk, |
1148 | * - anonymous pages (including MAP_PRIVATE file mappings) which have been | |
1149 | * modified may need to be swapped out to swap space and (later) to be read | |
1150 | * back into memory. | |
1da177e4 LT |
1151 | */ |
1152 | ||
27674ef6 | 1153 | #if defined(CONFIG_ZONE_DEVICE) && defined(CONFIG_FS_DAX) |
e7638488 | 1154 | DECLARE_STATIC_KEY_FALSE(devmap_managed_key); |
07d80269 | 1155 | |
f4f451a1 MS |
1156 | bool __put_devmap_managed_page_refs(struct page *page, int refs); |
1157 | static inline bool put_devmap_managed_page_refs(struct page *page, int refs) | |
e7638488 DW |
1158 | { |
1159 | if (!static_branch_unlikely(&devmap_managed_key)) | |
1160 | return false; | |
1161 | if (!is_zone_device_page(page)) | |
1162 | return false; | |
f4f451a1 | 1163 | return __put_devmap_managed_page_refs(page, refs); |
e7638488 | 1164 | } |
27674ef6 | 1165 | #else /* CONFIG_ZONE_DEVICE && CONFIG_FS_DAX */ |
f4f451a1 | 1166 | static inline bool put_devmap_managed_page_refs(struct page *page, int refs) |
e7638488 DW |
1167 | { |
1168 | return false; | |
1169 | } | |
27674ef6 | 1170 | #endif /* CONFIG_ZONE_DEVICE && CONFIG_FS_DAX */ |
7b2d55d2 | 1171 | |
f4f451a1 MS |
1172 | static inline bool put_devmap_managed_page(struct page *page) |
1173 | { | |
1174 | return put_devmap_managed_page_refs(page, 1); | |
1175 | } | |
1176 | ||
f958d7b5 | 1177 | /* 127: arbitrary random number, small enough to assemble well */ |
86d234cb MWO |
1178 | #define folio_ref_zero_or_close_to_overflow(folio) \ |
1179 | ((unsigned int) folio_ref_count(folio) + 127u <= 127u) | |
1180 | ||
1181 | /** | |
1182 | * folio_get - Increment the reference count on a folio. | |
1183 | * @folio: The folio. | |
1184 | * | |
1185 | * Context: May be called in any context, as long as you know that | |
1186 | * you have a refcount on the folio. If you do not already have one, | |
1187 | * folio_try_get() may be the right interface for you to use. | |
1188 | */ | |
1189 | static inline void folio_get(struct folio *folio) | |
1190 | { | |
1191 | VM_BUG_ON_FOLIO(folio_ref_zero_or_close_to_overflow(folio), folio); | |
1192 | folio_ref_inc(folio); | |
1193 | } | |
f958d7b5 | 1194 | |
3565fce3 DW |
1195 | static inline void get_page(struct page *page) |
1196 | { | |
86d234cb | 1197 | folio_get(page_folio(page)); |
3565fce3 DW |
1198 | } |
1199 | ||
3faa52c0 | 1200 | bool __must_check try_grab_page(struct page *page, unsigned int flags); |
cd1adf1b LT |
1201 | |
1202 | static inline __must_check bool try_get_page(struct page *page) | |
1203 | { | |
1204 | page = compound_head(page); | |
1205 | if (WARN_ON_ONCE(page_ref_count(page) <= 0)) | |
1206 | return false; | |
1207 | page_ref_inc(page); | |
1208 | return true; | |
1209 | } | |
3565fce3 | 1210 | |
b620f633 MWO |
1211 | /** |
1212 | * folio_put - Decrement the reference count on a folio. | |
1213 | * @folio: The folio. | |
1214 | * | |
1215 | * If the folio's reference count reaches zero, the memory will be | |
1216 | * released back to the page allocator and may be used by another | |
1217 | * allocation immediately. Do not access the memory or the struct folio | |
1218 | * after calling folio_put() unless you can be sure that it wasn't the | |
1219 | * last reference. | |
1220 | * | |
1221 | * Context: May be called in process or interrupt context, but not in NMI | |
1222 | * context. May be called while holding a spinlock. | |
1223 | */ | |
1224 | static inline void folio_put(struct folio *folio) | |
1225 | { | |
1226 | if (folio_put_testzero(folio)) | |
8d29c703 | 1227 | __folio_put(folio); |
b620f633 MWO |
1228 | } |
1229 | ||
3fe7fa58 MWO |
1230 | /** |
1231 | * folio_put_refs - Reduce the reference count on a folio. | |
1232 | * @folio: The folio. | |
1233 | * @refs: The amount to subtract from the folio's reference count. | |
1234 | * | |
1235 | * If the folio's reference count reaches zero, the memory will be | |
1236 | * released back to the page allocator and may be used by another | |
1237 | * allocation immediately. Do not access the memory or the struct folio | |
1238 | * after calling folio_put_refs() unless you can be sure that these weren't | |
1239 | * the last references. | |
1240 | * | |
1241 | * Context: May be called in process or interrupt context, but not in NMI | |
1242 | * context. May be called while holding a spinlock. | |
1243 | */ | |
1244 | static inline void folio_put_refs(struct folio *folio, int refs) | |
1245 | { | |
1246 | if (folio_ref_sub_and_test(folio, refs)) | |
8d29c703 | 1247 | __folio_put(folio); |
3fe7fa58 MWO |
1248 | } |
1249 | ||
449c7967 LT |
1250 | /** |
1251 | * release_pages - release an array of pages or folios | |
1252 | * | |
1253 | * This just releases a simple array of multiple pages, and | |
1254 | * accepts various different forms of said page array: either | |
1255 | * a regular old boring array of pages, an array of folios, or | |
1256 | * an array of encoded page pointers. | |
1257 | * | |
1258 | * The transparent union syntax for this kind of "any of these | |
1259 | * argument types" is all kinds of ugly, so look away. | |
1260 | */ | |
1261 | typedef union { | |
1262 | struct page **pages; | |
1263 | struct folio **folios; | |
1264 | struct encoded_page **encoded_pages; | |
1265 | } release_pages_arg __attribute__ ((__transparent_union__)); | |
1266 | ||
1267 | void release_pages(release_pages_arg, int nr); | |
e3c4cebf MWO |
1268 | |
1269 | /** | |
1270 | * folios_put - Decrement the reference count on an array of folios. | |
1271 | * @folios: The folios. | |
1272 | * @nr: How many folios there are. | |
1273 | * | |
1274 | * Like folio_put(), but for an array of folios. This is more efficient | |
1275 | * than writing the loop yourself as it will optimise the locks which | |
1276 | * need to be taken if the folios are freed. | |
1277 | * | |
1278 | * Context: May be called in process or interrupt context, but not in NMI | |
1279 | * context. May be called while holding a spinlock. | |
1280 | */ | |
1281 | static inline void folios_put(struct folio **folios, unsigned int nr) | |
1282 | { | |
449c7967 | 1283 | release_pages(folios, nr); |
3fe7fa58 MWO |
1284 | } |
1285 | ||
3565fce3 DW |
1286 | static inline void put_page(struct page *page) |
1287 | { | |
b620f633 | 1288 | struct folio *folio = page_folio(page); |
3565fce3 | 1289 | |
7b2d55d2 | 1290 | /* |
89574945 CH |
1291 | * For some devmap managed pages we need to catch refcount transition |
1292 | * from 2 to 1: | |
7b2d55d2 | 1293 | */ |
89574945 | 1294 | if (put_devmap_managed_page(&folio->page)) |
7b2d55d2 | 1295 | return; |
b620f633 | 1296 | folio_put(folio); |
3565fce3 DW |
1297 | } |
1298 | ||
3faa52c0 JH |
1299 | /* |
1300 | * GUP_PIN_COUNTING_BIAS, and the associated functions that use it, overload | |
1301 | * the page's refcount so that two separate items are tracked: the original page | |
1302 | * reference count, and also a new count of how many pin_user_pages() calls were | |
1303 | * made against the page. ("gup-pinned" is another term for the latter). | |
1304 | * | |
1305 | * With this scheme, pin_user_pages() becomes special: such pages are marked as | |
1306 | * distinct from normal pages. As such, the unpin_user_page() call (and its | |
1307 | * variants) must be used in order to release gup-pinned pages. | |
1308 | * | |
1309 | * Choice of value: | |
1310 | * | |
1311 | * By making GUP_PIN_COUNTING_BIAS a power of two, debugging of page reference | |
1312 | * counts with respect to pin_user_pages() and unpin_user_page() becomes | |
1313 | * simpler, due to the fact that adding an even power of two to the page | |
1314 | * refcount has the effect of using only the upper N bits, for the code that | |
1315 | * counts up using the bias value. This means that the lower bits are left for | |
1316 | * the exclusive use of the original code that increments and decrements by one | |
1317 | * (or at least, by much smaller values than the bias value). | |
fc1d8e7c | 1318 | * |
3faa52c0 JH |
1319 | * Of course, once the lower bits overflow into the upper bits (and this is |
1320 | * OK, because subtraction recovers the original values), then visual inspection | |
1321 | * no longer suffices to directly view the separate counts. However, for normal | |
1322 | * applications that don't have huge page reference counts, this won't be an | |
1323 | * issue. | |
fc1d8e7c | 1324 | * |
40fcc7fc MWO |
1325 | * Locking: the lockless algorithm described in folio_try_get_rcu() |
1326 | * provides safe operation for get_user_pages(), page_mkclean() and | |
1327 | * other calls that race to set up page table entries. | |
fc1d8e7c | 1328 | */ |
3faa52c0 | 1329 | #define GUP_PIN_COUNTING_BIAS (1U << 10) |
fc1d8e7c | 1330 | |
3faa52c0 | 1331 | void unpin_user_page(struct page *page); |
f1f6a7dd JH |
1332 | void unpin_user_pages_dirty_lock(struct page **pages, unsigned long npages, |
1333 | bool make_dirty); | |
458a4f78 JM |
1334 | void unpin_user_page_range_dirty_lock(struct page *page, unsigned long npages, |
1335 | bool make_dirty); | |
f1f6a7dd | 1336 | void unpin_user_pages(struct page **pages, unsigned long npages); |
fc1d8e7c | 1337 | |
97a7e473 PX |
1338 | static inline bool is_cow_mapping(vm_flags_t flags) |
1339 | { | |
1340 | return (flags & (VM_SHARED | VM_MAYWRITE)) == VM_MAYWRITE; | |
1341 | } | |
1342 | ||
9127ab4f CS |
1343 | #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP) |
1344 | #define SECTION_IN_PAGE_FLAGS | |
1345 | #endif | |
1346 | ||
89689ae7 | 1347 | /* |
7a8010cd VB |
1348 | * The identification function is mainly used by the buddy allocator for |
1349 | * determining if two pages could be buddies. We are not really identifying | |
1350 | * the zone since we could be using the section number id if we do not have | |
1351 | * node id available in page flags. | |
1352 | * We only guarantee that it will return the same value for two combinable | |
1353 | * pages in a zone. | |
89689ae7 | 1354 | */ |
cb2b95e1 AW |
1355 | static inline int page_zone_id(struct page *page) |
1356 | { | |
89689ae7 | 1357 | return (page->flags >> ZONEID_PGSHIFT) & ZONEID_MASK; |
348f8b6c DH |
1358 | } |
1359 | ||
89689ae7 | 1360 | #ifdef NODE_NOT_IN_PAGE_FLAGS |
33dd4e0e | 1361 | extern int page_to_nid(const struct page *page); |
89689ae7 | 1362 | #else |
33dd4e0e | 1363 | static inline int page_to_nid(const struct page *page) |
d41dee36 | 1364 | { |
f165b378 PT |
1365 | struct page *p = (struct page *)page; |
1366 | ||
1367 | return (PF_POISONED_CHECK(p)->flags >> NODES_PGSHIFT) & NODES_MASK; | |
d41dee36 | 1368 | } |
89689ae7 CL |
1369 | #endif |
1370 | ||
874fd90c MWO |
1371 | static inline int folio_nid(const struct folio *folio) |
1372 | { | |
1373 | return page_to_nid(&folio->page); | |
1374 | } | |
1375 | ||
57e0a030 | 1376 | #ifdef CONFIG_NUMA_BALANCING |
33024536 HY |
1377 | /* page access time bits needs to hold at least 4 seconds */ |
1378 | #define PAGE_ACCESS_TIME_MIN_BITS 12 | |
1379 | #if LAST_CPUPID_SHIFT < PAGE_ACCESS_TIME_MIN_BITS | |
1380 | #define PAGE_ACCESS_TIME_BUCKETS \ | |
1381 | (PAGE_ACCESS_TIME_MIN_BITS - LAST_CPUPID_SHIFT) | |
1382 | #else | |
1383 | #define PAGE_ACCESS_TIME_BUCKETS 0 | |
1384 | #endif | |
1385 | ||
1386 | #define PAGE_ACCESS_TIME_MASK \ | |
1387 | (LAST_CPUPID_MASK << PAGE_ACCESS_TIME_BUCKETS) | |
1388 | ||
90572890 | 1389 | static inline int cpu_pid_to_cpupid(int cpu, int pid) |
57e0a030 | 1390 | { |
90572890 | 1391 | return ((cpu & LAST__CPU_MASK) << LAST__PID_SHIFT) | (pid & LAST__PID_MASK); |
57e0a030 MG |
1392 | } |
1393 | ||
90572890 | 1394 | static inline int cpupid_to_pid(int cpupid) |
57e0a030 | 1395 | { |
90572890 | 1396 | return cpupid & LAST__PID_MASK; |
57e0a030 | 1397 | } |
b795854b | 1398 | |
90572890 | 1399 | static inline int cpupid_to_cpu(int cpupid) |
b795854b | 1400 | { |
90572890 | 1401 | return (cpupid >> LAST__PID_SHIFT) & LAST__CPU_MASK; |
b795854b MG |
1402 | } |
1403 | ||
90572890 | 1404 | static inline int cpupid_to_nid(int cpupid) |
b795854b | 1405 | { |
90572890 | 1406 | return cpu_to_node(cpupid_to_cpu(cpupid)); |
b795854b MG |
1407 | } |
1408 | ||
90572890 | 1409 | static inline bool cpupid_pid_unset(int cpupid) |
57e0a030 | 1410 | { |
90572890 | 1411 | return cpupid_to_pid(cpupid) == (-1 & LAST__PID_MASK); |
b795854b MG |
1412 | } |
1413 | ||
90572890 | 1414 | static inline bool cpupid_cpu_unset(int cpupid) |
b795854b | 1415 | { |
90572890 | 1416 | return cpupid_to_cpu(cpupid) == (-1 & LAST__CPU_MASK); |
b795854b MG |
1417 | } |
1418 | ||
8c8a743c PZ |
1419 | static inline bool __cpupid_match_pid(pid_t task_pid, int cpupid) |
1420 | { | |
1421 | return (task_pid & LAST__PID_MASK) == cpupid_to_pid(cpupid); | |
1422 | } | |
1423 | ||
1424 | #define cpupid_match_pid(task, cpupid) __cpupid_match_pid(task->pid, cpupid) | |
90572890 PZ |
1425 | #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS |
1426 | static inline int page_cpupid_xchg_last(struct page *page, int cpupid) | |
b795854b | 1427 | { |
1ae71d03 | 1428 | return xchg(&page->_last_cpupid, cpupid & LAST_CPUPID_MASK); |
b795854b | 1429 | } |
90572890 PZ |
1430 | |
1431 | static inline int page_cpupid_last(struct page *page) | |
1432 | { | |
1433 | return page->_last_cpupid; | |
1434 | } | |
1435 | static inline void page_cpupid_reset_last(struct page *page) | |
b795854b | 1436 | { |
1ae71d03 | 1437 | page->_last_cpupid = -1 & LAST_CPUPID_MASK; |
57e0a030 MG |
1438 | } |
1439 | #else | |
90572890 | 1440 | static inline int page_cpupid_last(struct page *page) |
75980e97 | 1441 | { |
90572890 | 1442 | return (page->flags >> LAST_CPUPID_PGSHIFT) & LAST_CPUPID_MASK; |
75980e97 PZ |
1443 | } |
1444 | ||
90572890 | 1445 | extern int page_cpupid_xchg_last(struct page *page, int cpupid); |
75980e97 | 1446 | |
90572890 | 1447 | static inline void page_cpupid_reset_last(struct page *page) |
75980e97 | 1448 | { |
09940a4f | 1449 | page->flags |= LAST_CPUPID_MASK << LAST_CPUPID_PGSHIFT; |
75980e97 | 1450 | } |
90572890 | 1451 | #endif /* LAST_CPUPID_NOT_IN_PAGE_FLAGS */ |
33024536 HY |
1452 | |
1453 | static inline int xchg_page_access_time(struct page *page, int time) | |
1454 | { | |
1455 | int last_time; | |
1456 | ||
1457 | last_time = page_cpupid_xchg_last(page, time >> PAGE_ACCESS_TIME_BUCKETS); | |
1458 | return last_time << PAGE_ACCESS_TIME_BUCKETS; | |
1459 | } | |
90572890 PZ |
1460 | #else /* !CONFIG_NUMA_BALANCING */ |
1461 | static inline int page_cpupid_xchg_last(struct page *page, int cpupid) | |
57e0a030 | 1462 | { |
90572890 | 1463 | return page_to_nid(page); /* XXX */ |
57e0a030 MG |
1464 | } |
1465 | ||
33024536 HY |
1466 | static inline int xchg_page_access_time(struct page *page, int time) |
1467 | { | |
1468 | return 0; | |
1469 | } | |
1470 | ||
90572890 | 1471 | static inline int page_cpupid_last(struct page *page) |
57e0a030 | 1472 | { |
90572890 | 1473 | return page_to_nid(page); /* XXX */ |
57e0a030 MG |
1474 | } |
1475 | ||
90572890 | 1476 | static inline int cpupid_to_nid(int cpupid) |
b795854b MG |
1477 | { |
1478 | return -1; | |
1479 | } | |
1480 | ||
90572890 | 1481 | static inline int cpupid_to_pid(int cpupid) |
b795854b MG |
1482 | { |
1483 | return -1; | |
1484 | } | |
1485 | ||
90572890 | 1486 | static inline int cpupid_to_cpu(int cpupid) |
b795854b MG |
1487 | { |
1488 | return -1; | |
1489 | } | |
1490 | ||
90572890 PZ |
1491 | static inline int cpu_pid_to_cpupid(int nid, int pid) |
1492 | { | |
1493 | return -1; | |
1494 | } | |
1495 | ||
1496 | static inline bool cpupid_pid_unset(int cpupid) | |
b795854b | 1497 | { |
2b787449 | 1498 | return true; |
b795854b MG |
1499 | } |
1500 | ||
90572890 | 1501 | static inline void page_cpupid_reset_last(struct page *page) |
57e0a030 MG |
1502 | { |
1503 | } | |
8c8a743c PZ |
1504 | |
1505 | static inline bool cpupid_match_pid(struct task_struct *task, int cpupid) | |
1506 | { | |
1507 | return false; | |
1508 | } | |
90572890 | 1509 | #endif /* CONFIG_NUMA_BALANCING */ |
57e0a030 | 1510 | |
2e903b91 | 1511 | #if defined(CONFIG_KASAN_SW_TAGS) || defined(CONFIG_KASAN_HW_TAGS) |
34303244 | 1512 | |
cf10bd4c AK |
1513 | /* |
1514 | * KASAN per-page tags are stored xor'ed with 0xff. This allows to avoid | |
1515 | * setting tags for all pages to native kernel tag value 0xff, as the default | |
1516 | * value 0x00 maps to 0xff. | |
1517 | */ | |
1518 | ||
2813b9c0 AK |
1519 | static inline u8 page_kasan_tag(const struct page *page) |
1520 | { | |
cf10bd4c AK |
1521 | u8 tag = 0xff; |
1522 | ||
1523 | if (kasan_enabled()) { | |
1524 | tag = (page->flags >> KASAN_TAG_PGSHIFT) & KASAN_TAG_MASK; | |
1525 | tag ^= 0xff; | |
1526 | } | |
1527 | ||
1528 | return tag; | |
2813b9c0 AK |
1529 | } |
1530 | ||
1531 | static inline void page_kasan_tag_set(struct page *page, u8 tag) | |
1532 | { | |
27fe7339 PC |
1533 | unsigned long old_flags, flags; |
1534 | ||
1535 | if (!kasan_enabled()) | |
1536 | return; | |
1537 | ||
1538 | tag ^= 0xff; | |
1539 | old_flags = READ_ONCE(page->flags); | |
1540 | do { | |
1541 | flags = old_flags; | |
1542 | flags &= ~(KASAN_TAG_MASK << KASAN_TAG_PGSHIFT); | |
1543 | flags |= (tag & KASAN_TAG_MASK) << KASAN_TAG_PGSHIFT; | |
1544 | } while (unlikely(!try_cmpxchg(&page->flags, &old_flags, flags))); | |
2813b9c0 AK |
1545 | } |
1546 | ||
1547 | static inline void page_kasan_tag_reset(struct page *page) | |
1548 | { | |
34303244 AK |
1549 | if (kasan_enabled()) |
1550 | page_kasan_tag_set(page, 0xff); | |
2813b9c0 | 1551 | } |
34303244 AK |
1552 | |
1553 | #else /* CONFIG_KASAN_SW_TAGS || CONFIG_KASAN_HW_TAGS */ | |
1554 | ||
2813b9c0 AK |
1555 | static inline u8 page_kasan_tag(const struct page *page) |
1556 | { | |
1557 | return 0xff; | |
1558 | } | |
1559 | ||
1560 | static inline void page_kasan_tag_set(struct page *page, u8 tag) { } | |
1561 | static inline void page_kasan_tag_reset(struct page *page) { } | |
34303244 AK |
1562 | |
1563 | #endif /* CONFIG_KASAN_SW_TAGS || CONFIG_KASAN_HW_TAGS */ | |
2813b9c0 | 1564 | |
33dd4e0e | 1565 | static inline struct zone *page_zone(const struct page *page) |
89689ae7 CL |
1566 | { |
1567 | return &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)]; | |
1568 | } | |
1569 | ||
75ef7184 MG |
1570 | static inline pg_data_t *page_pgdat(const struct page *page) |
1571 | { | |
1572 | return NODE_DATA(page_to_nid(page)); | |
1573 | } | |
1574 | ||
32b8fc48 MWO |
1575 | static inline struct zone *folio_zone(const struct folio *folio) |
1576 | { | |
1577 | return page_zone(&folio->page); | |
1578 | } | |
1579 | ||
1580 | static inline pg_data_t *folio_pgdat(const struct folio *folio) | |
1581 | { | |
1582 | return page_pgdat(&folio->page); | |
1583 | } | |
1584 | ||
9127ab4f | 1585 | #ifdef SECTION_IN_PAGE_FLAGS |
bf4e8902 DK |
1586 | static inline void set_page_section(struct page *page, unsigned long section) |
1587 | { | |
1588 | page->flags &= ~(SECTIONS_MASK << SECTIONS_PGSHIFT); | |
1589 | page->flags |= (section & SECTIONS_MASK) << SECTIONS_PGSHIFT; | |
1590 | } | |
1591 | ||
aa462abe | 1592 | static inline unsigned long page_to_section(const struct page *page) |
d41dee36 AW |
1593 | { |
1594 | return (page->flags >> SECTIONS_PGSHIFT) & SECTIONS_MASK; | |
1595 | } | |
308c05e3 | 1596 | #endif |
d41dee36 | 1597 | |
bf6bd276 MWO |
1598 | /** |
1599 | * folio_pfn - Return the Page Frame Number of a folio. | |
1600 | * @folio: The folio. | |
1601 | * | |
1602 | * A folio may contain multiple pages. The pages have consecutive | |
1603 | * Page Frame Numbers. | |
1604 | * | |
1605 | * Return: The Page Frame Number of the first page in the folio. | |
1606 | */ | |
1607 | static inline unsigned long folio_pfn(struct folio *folio) | |
1608 | { | |
1609 | return page_to_pfn(&folio->page); | |
1610 | } | |
1611 | ||
018ee47f YZ |
1612 | static inline struct folio *pfn_folio(unsigned long pfn) |
1613 | { | |
1614 | return page_folio(pfn_to_page(pfn)); | |
1615 | } | |
1616 | ||
3d11b225 MWO |
1617 | static inline atomic_t *folio_pincount_ptr(struct folio *folio) |
1618 | { | |
1619 | return &folio_page(folio, 1)->compound_pincount; | |
1620 | } | |
1621 | ||
0b90ddae MWO |
1622 | /** |
1623 | * folio_maybe_dma_pinned - Report if a folio may be pinned for DMA. | |
1624 | * @folio: The folio. | |
1625 | * | |
1626 | * This function checks if a folio has been pinned via a call to | |
1627 | * a function in the pin_user_pages() family. | |
1628 | * | |
1629 | * For small folios, the return value is partially fuzzy: false is not fuzzy, | |
1630 | * because it means "definitely not pinned for DMA", but true means "probably | |
1631 | * pinned for DMA, but possibly a false positive due to having at least | |
1632 | * GUP_PIN_COUNTING_BIAS worth of normal folio references". | |
1633 | * | |
1634 | * False positives are OK, because: a) it's unlikely for a folio to | |
1635 | * get that many refcounts, and b) all the callers of this routine are | |
1636 | * expected to be able to deal gracefully with a false positive. | |
1637 | * | |
1638 | * For large folios, the result will be exactly correct. That's because | |
1639 | * we have more tracking data available: the compound_pincount is used | |
1640 | * instead of the GUP_PIN_COUNTING_BIAS scheme. | |
1641 | * | |
1642 | * For more information, please see Documentation/core-api/pin_user_pages.rst. | |
1643 | * | |
1644 | * Return: True, if it is likely that the page has been "dma-pinned". | |
1645 | * False, if the page is definitely not dma-pinned. | |
1646 | */ | |
1647 | static inline bool folio_maybe_dma_pinned(struct folio *folio) | |
1648 | { | |
1649 | if (folio_test_large(folio)) | |
1650 | return atomic_read(folio_pincount_ptr(folio)) > 0; | |
1651 | ||
1652 | /* | |
1653 | * folio_ref_count() is signed. If that refcount overflows, then | |
1654 | * folio_ref_count() returns a negative value, and callers will avoid | |
1655 | * further incrementing the refcount. | |
1656 | * | |
1657 | * Here, for that overflow case, use the sign bit to count a little | |
1658 | * bit higher via unsigned math, and thus still get an accurate result. | |
1659 | */ | |
1660 | return ((unsigned int)folio_ref_count(folio)) >= | |
1661 | GUP_PIN_COUNTING_BIAS; | |
1662 | } | |
1663 | ||
1664 | static inline bool page_maybe_dma_pinned(struct page *page) | |
1665 | { | |
1666 | return folio_maybe_dma_pinned(page_folio(page)); | |
1667 | } | |
1668 | ||
1669 | /* | |
1670 | * This should most likely only be called during fork() to see whether we | |
fb3d824d | 1671 | * should break the cow immediately for an anon page on the src mm. |
623a1ddf DH |
1672 | * |
1673 | * The caller has to hold the PT lock and the vma->vm_mm->->write_protect_seq. | |
0b90ddae MWO |
1674 | */ |
1675 | static inline bool page_needs_cow_for_dma(struct vm_area_struct *vma, | |
1676 | struct page *page) | |
1677 | { | |
623a1ddf | 1678 | VM_BUG_ON(!(raw_read_seqcount(&vma->vm_mm->write_protect_seq) & 1)); |
0b90ddae MWO |
1679 | |
1680 | if (!test_bit(MMF_HAS_PINNED, &vma->vm_mm->flags)) | |
1681 | return false; | |
1682 | ||
1683 | return page_maybe_dma_pinned(page); | |
1684 | } | |
1685 | ||
8e3560d9 PT |
1686 | /* MIGRATE_CMA and ZONE_MOVABLE do not allow pin pages */ |
1687 | #ifdef CONFIG_MIGRATION | |
6077c943 | 1688 | static inline bool is_longterm_pinnable_page(struct page *page) |
8e3560d9 | 1689 | { |
1c563432 MK |
1690 | #ifdef CONFIG_CMA |
1691 | int mt = get_pageblock_migratetype(page); | |
1692 | ||
1693 | if (mt == MIGRATE_CMA || mt == MIGRATE_ISOLATE) | |
1694 | return false; | |
1695 | #endif | |
fcab34b4 AW |
1696 | /* The zero page may always be pinned */ |
1697 | if (is_zero_pfn(page_to_pfn(page))) | |
1698 | return true; | |
1699 | ||
1700 | /* Coherent device memory must always allow eviction. */ | |
1701 | if (is_device_coherent_page(page)) | |
1702 | return false; | |
1703 | ||
1704 | /* Otherwise, non-movable zone pages can be pinned. */ | |
1705 | return !is_zone_movable_page(page); | |
8e3560d9 PT |
1706 | } |
1707 | #else | |
6077c943 | 1708 | static inline bool is_longterm_pinnable_page(struct page *page) |
8e3560d9 PT |
1709 | { |
1710 | return true; | |
1711 | } | |
1712 | #endif | |
1713 | ||
6077c943 | 1714 | static inline bool folio_is_longterm_pinnable(struct folio *folio) |
536939ff | 1715 | { |
6077c943 | 1716 | return is_longterm_pinnable_page(&folio->page); |
536939ff MWO |
1717 | } |
1718 | ||
2f1b6248 | 1719 | static inline void set_page_zone(struct page *page, enum zone_type zone) |
348f8b6c DH |
1720 | { |
1721 | page->flags &= ~(ZONES_MASK << ZONES_PGSHIFT); | |
1722 | page->flags |= (zone & ZONES_MASK) << ZONES_PGSHIFT; | |
1723 | } | |
2f1b6248 | 1724 | |
348f8b6c DH |
1725 | static inline void set_page_node(struct page *page, unsigned long node) |
1726 | { | |
1727 | page->flags &= ~(NODES_MASK << NODES_PGSHIFT); | |
1728 | page->flags |= (node & NODES_MASK) << NODES_PGSHIFT; | |
1da177e4 | 1729 | } |
89689ae7 | 1730 | |
2f1b6248 | 1731 | static inline void set_page_links(struct page *page, enum zone_type zone, |
d41dee36 | 1732 | unsigned long node, unsigned long pfn) |
1da177e4 | 1733 | { |
348f8b6c DH |
1734 | set_page_zone(page, zone); |
1735 | set_page_node(page, node); | |
9127ab4f | 1736 | #ifdef SECTION_IN_PAGE_FLAGS |
d41dee36 | 1737 | set_page_section(page, pfn_to_section_nr(pfn)); |
bf4e8902 | 1738 | #endif |
1da177e4 LT |
1739 | } |
1740 | ||
7b230db3 MWO |
1741 | /** |
1742 | * folio_nr_pages - The number of pages in the folio. | |
1743 | * @folio: The folio. | |
1744 | * | |
1745 | * Return: A positive power of two. | |
1746 | */ | |
1747 | static inline long folio_nr_pages(struct folio *folio) | |
1748 | { | |
c3a15bff MWO |
1749 | if (!folio_test_large(folio)) |
1750 | return 1; | |
1751 | #ifdef CONFIG_64BIT | |
1752 | return folio->_folio_nr_pages; | |
1753 | #else | |
1754 | return 1L << folio->_folio_order; | |
1755 | #endif | |
7b230db3 MWO |
1756 | } |
1757 | ||
1758 | /** | |
1759 | * folio_next - Move to the next physical folio. | |
1760 | * @folio: The folio we're currently operating on. | |
1761 | * | |
1762 | * If you have physically contiguous memory which may span more than | |
1763 | * one folio (eg a &struct bio_vec), use this function to move from one | |
1764 | * folio to the next. Do not use it if the memory is only virtually | |
1765 | * contiguous as the folios are almost certainly not adjacent to each | |
1766 | * other. This is the folio equivalent to writing ``page++``. | |
1767 | * | |
1768 | * Context: We assume that the folios are refcounted and/or locked at a | |
1769 | * higher level and do not adjust the reference counts. | |
1770 | * Return: The next struct folio. | |
1771 | */ | |
1772 | static inline struct folio *folio_next(struct folio *folio) | |
1773 | { | |
1774 | return (struct folio *)folio_page(folio, folio_nr_pages(folio)); | |
1775 | } | |
1776 | ||
1777 | /** | |
1778 | * folio_shift - The size of the memory described by this folio. | |
1779 | * @folio: The folio. | |
1780 | * | |
1781 | * A folio represents a number of bytes which is a power-of-two in size. | |
1782 | * This function tells you which power-of-two the folio is. See also | |
1783 | * folio_size() and folio_order(). | |
1784 | * | |
1785 | * Context: The caller should have a reference on the folio to prevent | |
1786 | * it from being split. It is not necessary for the folio to be locked. | |
1787 | * Return: The base-2 logarithm of the size of this folio. | |
1788 | */ | |
1789 | static inline unsigned int folio_shift(struct folio *folio) | |
1790 | { | |
1791 | return PAGE_SHIFT + folio_order(folio); | |
1792 | } | |
1793 | ||
1794 | /** | |
1795 | * folio_size - The number of bytes in a folio. | |
1796 | * @folio: The folio. | |
1797 | * | |
1798 | * Context: The caller should have a reference on the folio to prevent | |
1799 | * it from being split. It is not necessary for the folio to be locked. | |
1800 | * Return: The number of bytes in this folio. | |
1801 | */ | |
1802 | static inline size_t folio_size(struct folio *folio) | |
1803 | { | |
1804 | return PAGE_SIZE << folio_order(folio); | |
1805 | } | |
1806 | ||
b424de33 MWO |
1807 | #ifndef HAVE_ARCH_MAKE_PAGE_ACCESSIBLE |
1808 | static inline int arch_make_page_accessible(struct page *page) | |
1809 | { | |
1810 | return 0; | |
1811 | } | |
1812 | #endif | |
1813 | ||
1814 | #ifndef HAVE_ARCH_MAKE_FOLIO_ACCESSIBLE | |
1815 | static inline int arch_make_folio_accessible(struct folio *folio) | |
1816 | { | |
1817 | int ret; | |
1818 | long i, nr = folio_nr_pages(folio); | |
1819 | ||
1820 | for (i = 0; i < nr; i++) { | |
1821 | ret = arch_make_page_accessible(folio_page(folio, i)); | |
1822 | if (ret) | |
1823 | break; | |
1824 | } | |
1825 | ||
1826 | return ret; | |
1827 | } | |
1828 | #endif | |
1829 | ||
f6ac2354 CL |
1830 | /* |
1831 | * Some inline functions in vmstat.h depend on page_zone() | |
1832 | */ | |
1833 | #include <linux/vmstat.h> | |
1834 | ||
33dd4e0e | 1835 | static __always_inline void *lowmem_page_address(const struct page *page) |
1da177e4 | 1836 | { |
1dff8083 | 1837 | return page_to_virt(page); |
1da177e4 LT |
1838 | } |
1839 | ||
1840 | #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL) | |
1841 | #define HASHED_PAGE_VIRTUAL | |
1842 | #endif | |
1843 | ||
1844 | #if defined(WANT_PAGE_VIRTUAL) | |
f92f455f GU |
1845 | static inline void *page_address(const struct page *page) |
1846 | { | |
1847 | return page->virtual; | |
1848 | } | |
1849 | static inline void set_page_address(struct page *page, void *address) | |
1850 | { | |
1851 | page->virtual = address; | |
1852 | } | |
1da177e4 LT |
1853 | #define page_address_init() do { } while(0) |
1854 | #endif | |
1855 | ||
1856 | #if defined(HASHED_PAGE_VIRTUAL) | |
f9918794 | 1857 | void *page_address(const struct page *page); |
1da177e4 LT |
1858 | void set_page_address(struct page *page, void *virtual); |
1859 | void page_address_init(void); | |
1860 | #endif | |
1861 | ||
1862 | #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL) | |
1863 | #define page_address(page) lowmem_page_address(page) | |
1864 | #define set_page_address(page, address) do { } while(0) | |
1865 | #define page_address_init() do { } while(0) | |
1866 | #endif | |
1867 | ||
7d4203c1 VB |
1868 | static inline void *folio_address(const struct folio *folio) |
1869 | { | |
1870 | return page_address(&folio->page); | |
1871 | } | |
1872 | ||
e39155ea | 1873 | extern void *page_rmapping(struct page *page); |
f6ab1f7f HY |
1874 | extern pgoff_t __page_file_index(struct page *page); |
1875 | ||
1da177e4 LT |
1876 | /* |
1877 | * Return the pagecache index of the passed page. Regular pagecache pages | |
f6ab1f7f | 1878 | * use ->index whereas swapcache pages use swp_offset(->private) |
1da177e4 LT |
1879 | */ |
1880 | static inline pgoff_t page_index(struct page *page) | |
1881 | { | |
1882 | if (unlikely(PageSwapCache(page))) | |
f6ab1f7f | 1883 | return __page_file_index(page); |
1da177e4 LT |
1884 | return page->index; |
1885 | } | |
1886 | ||
2f064f34 MH |
1887 | /* |
1888 | * Return true only if the page has been allocated with | |
1889 | * ALLOC_NO_WATERMARKS and the low watermark was not | |
1890 | * met implying that the system is under some pressure. | |
1891 | */ | |
1d7bab6a | 1892 | static inline bool page_is_pfmemalloc(const struct page *page) |
2f064f34 MH |
1893 | { |
1894 | /* | |
c07aea3e MC |
1895 | * lru.next has bit 1 set if the page is allocated from the |
1896 | * pfmemalloc reserves. Callers may simply overwrite it if | |
1897 | * they do not need to preserve that information. | |
2f064f34 | 1898 | */ |
c07aea3e | 1899 | return (uintptr_t)page->lru.next & BIT(1); |
2f064f34 MH |
1900 | } |
1901 | ||
1902 | /* | |
1903 | * Only to be called by the page allocator on a freshly allocated | |
1904 | * page. | |
1905 | */ | |
1906 | static inline void set_page_pfmemalloc(struct page *page) | |
1907 | { | |
c07aea3e | 1908 | page->lru.next = (void *)BIT(1); |
2f064f34 MH |
1909 | } |
1910 | ||
1911 | static inline void clear_page_pfmemalloc(struct page *page) | |
1912 | { | |
c07aea3e | 1913 | page->lru.next = NULL; |
2f064f34 MH |
1914 | } |
1915 | ||
1c0fe6e3 NP |
1916 | /* |
1917 | * Can be called by the pagefault handler when it gets a VM_FAULT_OOM. | |
1918 | */ | |
1919 | extern void pagefault_out_of_memory(void); | |
1920 | ||
1da177e4 | 1921 | #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK) |
ee6c400f | 1922 | #define offset_in_thp(page, p) ((unsigned long)(p) & (thp_size(page) - 1)) |
7b230db3 | 1923 | #define offset_in_folio(folio, p) ((unsigned long)(p) & (folio_size(folio) - 1)) |
1da177e4 | 1924 | |
ddd588b5 | 1925 | /* |
7bf02ea2 | 1926 | * Flags passed to show_mem() and show_free_areas() to suppress output in |
ddd588b5 DR |
1927 | * various contexts. |
1928 | */ | |
4b59e6c4 | 1929 | #define SHOW_MEM_FILTER_NODES (0x0001u) /* disallowed nodes */ |
ddd588b5 | 1930 | |
974f4367 MH |
1931 | extern void __show_free_areas(unsigned int flags, nodemask_t *nodemask, int max_zone_idx); |
1932 | static void __maybe_unused show_free_areas(unsigned int flags, nodemask_t *nodemask) | |
1933 | { | |
1934 | __show_free_areas(flags, nodemask, MAX_NR_ZONES - 1); | |
1935 | } | |
1da177e4 | 1936 | |
21b85b09 MK |
1937 | /* |
1938 | * Parameter block passed down to zap_pte_range in exceptional cases. | |
1939 | */ | |
1940 | struct zap_details { | |
1941 | struct folio *single_folio; /* Locked folio to be unmapped */ | |
1942 | bool even_cows; /* Zap COWed private pages too? */ | |
1943 | zap_flags_t zap_flags; /* Extra flags for zapping */ | |
1944 | }; | |
1945 | ||
1946 | /* | |
1947 | * Whether to drop the pte markers, for example, the uffd-wp information for | |
1948 | * file-backed memory. This should only be specified when we will completely | |
1949 | * drop the page in the mm, either by truncation or unmapping of the vma. By | |
1950 | * default, the flag is not set. | |
1951 | */ | |
1952 | #define ZAP_FLAG_DROP_MARKER ((__force zap_flags_t) BIT(0)) | |
04ada095 MK |
1953 | /* Set in unmap_vmas() to indicate a final unmap call. Only used by hugetlb */ |
1954 | #define ZAP_FLAG_UNMAP ((__force zap_flags_t) BIT(1)) | |
21b85b09 | 1955 | |
710ec38b | 1956 | #ifdef CONFIG_MMU |
7f43add4 | 1957 | extern bool can_do_mlock(void); |
710ec38b AB |
1958 | #else |
1959 | static inline bool can_do_mlock(void) { return false; } | |
1960 | #endif | |
d7c9e99a AG |
1961 | extern int user_shm_lock(size_t, struct ucounts *); |
1962 | extern void user_shm_unlock(size_t, struct ucounts *); | |
1da177e4 | 1963 | |
25b2995a CH |
1964 | struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr, |
1965 | pte_t pte); | |
28093f9f GS |
1966 | struct page *vm_normal_page_pmd(struct vm_area_struct *vma, unsigned long addr, |
1967 | pmd_t pmd); | |
7e675137 | 1968 | |
27d036e3 LR |
1969 | void zap_vma_ptes(struct vm_area_struct *vma, unsigned long address, |
1970 | unsigned long size); | |
14f5ff5d | 1971 | void zap_page_range(struct vm_area_struct *vma, unsigned long address, |
27d036e3 | 1972 | unsigned long size); |
21b85b09 MK |
1973 | void zap_page_range_single(struct vm_area_struct *vma, unsigned long address, |
1974 | unsigned long size, struct zap_details *details); | |
763ecb03 LH |
1975 | void unmap_vmas(struct mmu_gather *tlb, struct maple_tree *mt, |
1976 | struct vm_area_struct *start_vma, unsigned long start, | |
1977 | unsigned long end); | |
e6473092 | 1978 | |
ac46d4f3 JG |
1979 | struct mmu_notifier_range; |
1980 | ||
42b77728 | 1981 | void free_pgd_range(struct mmu_gather *tlb, unsigned long addr, |
3bf5ee95 | 1982 | unsigned long end, unsigned long floor, unsigned long ceiling); |
c78f4636 PX |
1983 | int |
1984 | copy_page_range(struct vm_area_struct *dst_vma, struct vm_area_struct *src_vma); | |
ff5c19ed | 1985 | int follow_pte(struct mm_struct *mm, unsigned long address, |
9fd6dad1 | 1986 | pte_t **ptepp, spinlock_t **ptlp); |
3b6748e2 JW |
1987 | int follow_pfn(struct vm_area_struct *vma, unsigned long address, |
1988 | unsigned long *pfn); | |
d87fe660 | 1989 | int follow_phys(struct vm_area_struct *vma, unsigned long address, |
1990 | unsigned int flags, unsigned long *prot, resource_size_t *phys); | |
28b2ee20 RR |
1991 | int generic_access_phys(struct vm_area_struct *vma, unsigned long addr, |
1992 | void *buf, int len, int write); | |
1da177e4 | 1993 | |
7caef267 | 1994 | extern void truncate_pagecache(struct inode *inode, loff_t new); |
2c27c65e | 1995 | extern void truncate_setsize(struct inode *inode, loff_t newsize); |
90a80202 | 1996 | void pagecache_isize_extended(struct inode *inode, loff_t from, loff_t to); |
623e3db9 | 1997 | void truncate_pagecache_range(struct inode *inode, loff_t offset, loff_t end); |
25718736 | 1998 | int generic_error_remove_page(struct address_space *mapping, struct page *page); |
83f78668 | 1999 | |
7ee1dd3f | 2000 | #ifdef CONFIG_MMU |
2b740303 | 2001 | extern vm_fault_t handle_mm_fault(struct vm_area_struct *vma, |
bce617ed PX |
2002 | unsigned long address, unsigned int flags, |
2003 | struct pt_regs *regs); | |
64019a2e | 2004 | extern int fixup_user_fault(struct mm_struct *mm, |
4a9e1cda DD |
2005 | unsigned long address, unsigned int fault_flags, |
2006 | bool *unlocked); | |
977fbdcd MW |
2007 | void unmap_mapping_pages(struct address_space *mapping, |
2008 | pgoff_t start, pgoff_t nr, bool even_cows); | |
2009 | void unmap_mapping_range(struct address_space *mapping, | |
2010 | loff_t const holebegin, loff_t const holelen, int even_cows); | |
7ee1dd3f | 2011 | #else |
2b740303 | 2012 | static inline vm_fault_t handle_mm_fault(struct vm_area_struct *vma, |
bce617ed PX |
2013 | unsigned long address, unsigned int flags, |
2014 | struct pt_regs *regs) | |
7ee1dd3f DH |
2015 | { |
2016 | /* should never happen if there's no MMU */ | |
2017 | BUG(); | |
2018 | return VM_FAULT_SIGBUS; | |
2019 | } | |
64019a2e | 2020 | static inline int fixup_user_fault(struct mm_struct *mm, unsigned long address, |
4a9e1cda | 2021 | unsigned int fault_flags, bool *unlocked) |
5c723ba5 PZ |
2022 | { |
2023 | /* should never happen if there's no MMU */ | |
2024 | BUG(); | |
2025 | return -EFAULT; | |
2026 | } | |
977fbdcd MW |
2027 | static inline void unmap_mapping_pages(struct address_space *mapping, |
2028 | pgoff_t start, pgoff_t nr, bool even_cows) { } | |
2029 | static inline void unmap_mapping_range(struct address_space *mapping, | |
2030 | loff_t const holebegin, loff_t const holelen, int even_cows) { } | |
7ee1dd3f | 2031 | #endif |
f33ea7f4 | 2032 | |
977fbdcd MW |
2033 | static inline void unmap_shared_mapping_range(struct address_space *mapping, |
2034 | loff_t const holebegin, loff_t const holelen) | |
2035 | { | |
2036 | unmap_mapping_range(mapping, holebegin, holelen, 0); | |
2037 | } | |
2038 | ||
2039 | extern int access_process_vm(struct task_struct *tsk, unsigned long addr, | |
2040 | void *buf, int len, unsigned int gup_flags); | |
5ddd36b9 | 2041 | extern int access_remote_vm(struct mm_struct *mm, unsigned long addr, |
6347e8d5 | 2042 | void *buf, int len, unsigned int gup_flags); |
d3f5ffca JH |
2043 | extern int __access_remote_vm(struct mm_struct *mm, unsigned long addr, |
2044 | void *buf, int len, unsigned int gup_flags); | |
1da177e4 | 2045 | |
64019a2e | 2046 | long get_user_pages_remote(struct mm_struct *mm, |
1e987790 | 2047 | unsigned long start, unsigned long nr_pages, |
9beae1ea | 2048 | unsigned int gup_flags, struct page **pages, |
5b56d49f | 2049 | struct vm_area_struct **vmas, int *locked); |
64019a2e | 2050 | long pin_user_pages_remote(struct mm_struct *mm, |
eddb1c22 JH |
2051 | unsigned long start, unsigned long nr_pages, |
2052 | unsigned int gup_flags, struct page **pages, | |
2053 | struct vm_area_struct **vmas, int *locked); | |
c12d2da5 | 2054 | long get_user_pages(unsigned long start, unsigned long nr_pages, |
768ae309 | 2055 | unsigned int gup_flags, struct page **pages, |
cde70140 | 2056 | struct vm_area_struct **vmas); |
eddb1c22 JH |
2057 | long pin_user_pages(unsigned long start, unsigned long nr_pages, |
2058 | unsigned int gup_flags, struct page **pages, | |
2059 | struct vm_area_struct **vmas); | |
c12d2da5 | 2060 | long get_user_pages_unlocked(unsigned long start, unsigned long nr_pages, |
c164154f | 2061 | struct page **pages, unsigned int gup_flags); |
91429023 JH |
2062 | long pin_user_pages_unlocked(unsigned long start, unsigned long nr_pages, |
2063 | struct page **pages, unsigned int gup_flags); | |
9a4e9f3b | 2064 | |
73b0140b IW |
2065 | int get_user_pages_fast(unsigned long start, int nr_pages, |
2066 | unsigned int gup_flags, struct page **pages); | |
eddb1c22 JH |
2067 | int pin_user_pages_fast(unsigned long start, int nr_pages, |
2068 | unsigned int gup_flags, struct page **pages); | |
8025e5dd | 2069 | |
79eb597c DJ |
2070 | int account_locked_vm(struct mm_struct *mm, unsigned long pages, bool inc); |
2071 | int __account_locked_vm(struct mm_struct *mm, unsigned long pages, bool inc, | |
2072 | struct task_struct *task, bool bypass_rlim); | |
2073 | ||
18022c5d MG |
2074 | struct kvec; |
2075 | int get_kernel_pages(const struct kvec *iov, int nr_pages, int write, | |
2076 | struct page **pages); | |
f3e8fccd | 2077 | struct page *get_dump_page(unsigned long addr); |
1da177e4 | 2078 | |
b5e84594 MWO |
2079 | bool folio_mark_dirty(struct folio *folio); |
2080 | bool set_page_dirty(struct page *page); | |
1da177e4 | 2081 | int set_page_dirty_lock(struct page *page); |
b9ea2515 | 2082 | |
a9090253 | 2083 | int get_cmdline(struct task_struct *task, char *buffer, int buflen); |
1da177e4 | 2084 | |
b6a2fea3 OW |
2085 | extern unsigned long move_page_tables(struct vm_area_struct *vma, |
2086 | unsigned long old_addr, struct vm_area_struct *new_vma, | |
38a76013 ML |
2087 | unsigned long new_addr, unsigned long len, |
2088 | bool need_rmap_locks); | |
58705444 PX |
2089 | |
2090 | /* | |
2091 | * Flags used by change_protection(). For now we make it a bitmap so | |
2092 | * that we can pass in multiple flags just like parameters. However | |
2093 | * for now all the callers are only use one of the flags at the same | |
2094 | * time. | |
2095 | */ | |
64fe24a3 DH |
2096 | /* |
2097 | * Whether we should manually check if we can map individual PTEs writable, | |
2098 | * because something (e.g., COW, uffd-wp) blocks that from happening for all | |
2099 | * PTEs automatically in a writable mapping. | |
2100 | */ | |
2101 | #define MM_CP_TRY_CHANGE_WRITABLE (1UL << 0) | |
58705444 PX |
2102 | /* Whether this protection change is for NUMA hints */ |
2103 | #define MM_CP_PROT_NUMA (1UL << 1) | |
292924b2 PX |
2104 | /* Whether this change is for write protecting */ |
2105 | #define MM_CP_UFFD_WP (1UL << 2) /* do wp */ | |
2106 | #define MM_CP_UFFD_WP_RESOLVE (1UL << 3) /* Resolve wp */ | |
2107 | #define MM_CP_UFFD_WP_ALL (MM_CP_UFFD_WP | \ | |
2108 | MM_CP_UFFD_WP_RESOLVE) | |
58705444 | 2109 | |
eb309ec8 DH |
2110 | int vma_wants_writenotify(struct vm_area_struct *vma, pgprot_t vm_page_prot); |
2111 | static inline bool vma_wants_manual_pte_write_upgrade(struct vm_area_struct *vma) | |
2112 | { | |
2113 | /* | |
2114 | * We want to check manually if we can change individual PTEs writable | |
2115 | * if we can't do that automatically for all PTEs in a mapping. For | |
2116 | * private mappings, that's always the case when we have write | |
2117 | * permissions as we properly have to handle COW. | |
2118 | */ | |
2119 | if (vma->vm_flags & VM_SHARED) | |
2120 | return vma_wants_writenotify(vma, vma->vm_page_prot); | |
2121 | return !!(vma->vm_flags & VM_WRITE); | |
2122 | ||
2123 | } | |
6a56ccbc DH |
2124 | bool can_change_pte_writable(struct vm_area_struct *vma, unsigned long addr, |
2125 | pte_t pte); | |
4a18419f NA |
2126 | extern unsigned long change_protection(struct mmu_gather *tlb, |
2127 | struct vm_area_struct *vma, unsigned long start, | |
7da4d641 | 2128 | unsigned long end, pgprot_t newprot, |
58705444 | 2129 | unsigned long cp_flags); |
4a18419f | 2130 | extern int mprotect_fixup(struct mmu_gather *tlb, struct vm_area_struct *vma, |
b6a2fea3 OW |
2131 | struct vm_area_struct **pprev, unsigned long start, |
2132 | unsigned long end, unsigned long newflags); | |
1da177e4 | 2133 | |
465a454f PZ |
2134 | /* |
2135 | * doesn't attempt to fault and will return short. | |
2136 | */ | |
dadbb612 SJ |
2137 | int get_user_pages_fast_only(unsigned long start, int nr_pages, |
2138 | unsigned int gup_flags, struct page **pages); | |
104acc32 JH |
2139 | int pin_user_pages_fast_only(unsigned long start, int nr_pages, |
2140 | unsigned int gup_flags, struct page **pages); | |
dadbb612 SJ |
2141 | |
2142 | static inline bool get_user_page_fast_only(unsigned long addr, | |
2143 | unsigned int gup_flags, struct page **pagep) | |
2144 | { | |
2145 | return get_user_pages_fast_only(addr, 1, gup_flags, pagep) == 1; | |
2146 | } | |
d559db08 KH |
2147 | /* |
2148 | * per-process(per-mm_struct) statistics. | |
2149 | */ | |
d559db08 KH |
2150 | static inline unsigned long get_mm_counter(struct mm_struct *mm, int member) |
2151 | { | |
f1a79412 | 2152 | return percpu_counter_read_positive(&mm->rss_stat[member]); |
69c97823 | 2153 | } |
d559db08 | 2154 | |
f1a79412 | 2155 | void mm_trace_rss_stat(struct mm_struct *mm, int member); |
b3d1411b | 2156 | |
d559db08 KH |
2157 | static inline void add_mm_counter(struct mm_struct *mm, int member, long value) |
2158 | { | |
f1a79412 | 2159 | percpu_counter_add(&mm->rss_stat[member], value); |
b3d1411b | 2160 | |
f1a79412 | 2161 | mm_trace_rss_stat(mm, member); |
d559db08 KH |
2162 | } |
2163 | ||
2164 | static inline void inc_mm_counter(struct mm_struct *mm, int member) | |
2165 | { | |
f1a79412 | 2166 | percpu_counter_inc(&mm->rss_stat[member]); |
b3d1411b | 2167 | |
f1a79412 | 2168 | mm_trace_rss_stat(mm, member); |
d559db08 KH |
2169 | } |
2170 | ||
2171 | static inline void dec_mm_counter(struct mm_struct *mm, int member) | |
2172 | { | |
f1a79412 | 2173 | percpu_counter_dec(&mm->rss_stat[member]); |
b3d1411b | 2174 | |
f1a79412 | 2175 | mm_trace_rss_stat(mm, member); |
d559db08 KH |
2176 | } |
2177 | ||
eca56ff9 JM |
2178 | /* Optimized variant when page is already known not to be PageAnon */ |
2179 | static inline int mm_counter_file(struct page *page) | |
2180 | { | |
2181 | if (PageSwapBacked(page)) | |
2182 | return MM_SHMEMPAGES; | |
2183 | return MM_FILEPAGES; | |
2184 | } | |
2185 | ||
2186 | static inline int mm_counter(struct page *page) | |
2187 | { | |
2188 | if (PageAnon(page)) | |
2189 | return MM_ANONPAGES; | |
2190 | return mm_counter_file(page); | |
2191 | } | |
2192 | ||
d559db08 KH |
2193 | static inline unsigned long get_mm_rss(struct mm_struct *mm) |
2194 | { | |
2195 | return get_mm_counter(mm, MM_FILEPAGES) + | |
eca56ff9 JM |
2196 | get_mm_counter(mm, MM_ANONPAGES) + |
2197 | get_mm_counter(mm, MM_SHMEMPAGES); | |
d559db08 KH |
2198 | } |
2199 | ||
2200 | static inline unsigned long get_mm_hiwater_rss(struct mm_struct *mm) | |
2201 | { | |
2202 | return max(mm->hiwater_rss, get_mm_rss(mm)); | |
2203 | } | |
2204 | ||
2205 | static inline unsigned long get_mm_hiwater_vm(struct mm_struct *mm) | |
2206 | { | |
2207 | return max(mm->hiwater_vm, mm->total_vm); | |
2208 | } | |
2209 | ||
2210 | static inline void update_hiwater_rss(struct mm_struct *mm) | |
2211 | { | |
2212 | unsigned long _rss = get_mm_rss(mm); | |
2213 | ||
2214 | if ((mm)->hiwater_rss < _rss) | |
2215 | (mm)->hiwater_rss = _rss; | |
2216 | } | |
2217 | ||
2218 | static inline void update_hiwater_vm(struct mm_struct *mm) | |
2219 | { | |
2220 | if (mm->hiwater_vm < mm->total_vm) | |
2221 | mm->hiwater_vm = mm->total_vm; | |
2222 | } | |
2223 | ||
695f0559 PC |
2224 | static inline void reset_mm_hiwater_rss(struct mm_struct *mm) |
2225 | { | |
2226 | mm->hiwater_rss = get_mm_rss(mm); | |
2227 | } | |
2228 | ||
d559db08 KH |
2229 | static inline void setmax_mm_hiwater_rss(unsigned long *maxrss, |
2230 | struct mm_struct *mm) | |
2231 | { | |
2232 | unsigned long hiwater_rss = get_mm_hiwater_rss(mm); | |
2233 | ||
2234 | if (*maxrss < hiwater_rss) | |
2235 | *maxrss = hiwater_rss; | |
2236 | } | |
2237 | ||
53bddb4e | 2238 | #if defined(SPLIT_RSS_COUNTING) |
05af2e10 | 2239 | void sync_mm_rss(struct mm_struct *mm); |
53bddb4e | 2240 | #else |
05af2e10 | 2241 | static inline void sync_mm_rss(struct mm_struct *mm) |
53bddb4e KH |
2242 | { |
2243 | } | |
2244 | #endif | |
465a454f | 2245 | |
78e7c5af AK |
2246 | #ifndef CONFIG_ARCH_HAS_PTE_SPECIAL |
2247 | static inline int pte_special(pte_t pte) | |
2248 | { | |
2249 | return 0; | |
2250 | } | |
2251 | ||
2252 | static inline pte_t pte_mkspecial(pte_t pte) | |
2253 | { | |
2254 | return pte; | |
2255 | } | |
2256 | #endif | |
2257 | ||
17596731 | 2258 | #ifndef CONFIG_ARCH_HAS_PTE_DEVMAP |
3565fce3 DW |
2259 | static inline int pte_devmap(pte_t pte) |
2260 | { | |
2261 | return 0; | |
2262 | } | |
2263 | #endif | |
2264 | ||
25ca1d6c NK |
2265 | extern pte_t *__get_locked_pte(struct mm_struct *mm, unsigned long addr, |
2266 | spinlock_t **ptl); | |
2267 | static inline pte_t *get_locked_pte(struct mm_struct *mm, unsigned long addr, | |
2268 | spinlock_t **ptl) | |
2269 | { | |
2270 | pte_t *ptep; | |
2271 | __cond_lock(*ptl, ptep = __get_locked_pte(mm, addr, ptl)); | |
2272 | return ptep; | |
2273 | } | |
c9cfcddf | 2274 | |
c2febafc KS |
2275 | #ifdef __PAGETABLE_P4D_FOLDED |
2276 | static inline int __p4d_alloc(struct mm_struct *mm, pgd_t *pgd, | |
2277 | unsigned long address) | |
2278 | { | |
2279 | return 0; | |
2280 | } | |
2281 | #else | |
2282 | int __p4d_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address); | |
2283 | #endif | |
2284 | ||
b4e98d9a | 2285 | #if defined(__PAGETABLE_PUD_FOLDED) || !defined(CONFIG_MMU) |
c2febafc | 2286 | static inline int __pud_alloc(struct mm_struct *mm, p4d_t *p4d, |
5f22df00 NP |
2287 | unsigned long address) |
2288 | { | |
2289 | return 0; | |
2290 | } | |
b4e98d9a KS |
2291 | static inline void mm_inc_nr_puds(struct mm_struct *mm) {} |
2292 | static inline void mm_dec_nr_puds(struct mm_struct *mm) {} | |
2293 | ||
5f22df00 | 2294 | #else |
c2febafc | 2295 | int __pud_alloc(struct mm_struct *mm, p4d_t *p4d, unsigned long address); |
b4e98d9a | 2296 | |
b4e98d9a KS |
2297 | static inline void mm_inc_nr_puds(struct mm_struct *mm) |
2298 | { | |
6d212db1 MS |
2299 | if (mm_pud_folded(mm)) |
2300 | return; | |
af5b0f6a | 2301 | atomic_long_add(PTRS_PER_PUD * sizeof(pud_t), &mm->pgtables_bytes); |
b4e98d9a KS |
2302 | } |
2303 | ||
2304 | static inline void mm_dec_nr_puds(struct mm_struct *mm) | |
2305 | { | |
6d212db1 MS |
2306 | if (mm_pud_folded(mm)) |
2307 | return; | |
af5b0f6a | 2308 | atomic_long_sub(PTRS_PER_PUD * sizeof(pud_t), &mm->pgtables_bytes); |
b4e98d9a | 2309 | } |
5f22df00 NP |
2310 | #endif |
2311 | ||
2d2f5119 | 2312 | #if defined(__PAGETABLE_PMD_FOLDED) || !defined(CONFIG_MMU) |
5f22df00 NP |
2313 | static inline int __pmd_alloc(struct mm_struct *mm, pud_t *pud, |
2314 | unsigned long address) | |
2315 | { | |
2316 | return 0; | |
2317 | } | |
dc6c9a35 | 2318 | |
dc6c9a35 KS |
2319 | static inline void mm_inc_nr_pmds(struct mm_struct *mm) {} |
2320 | static inline void mm_dec_nr_pmds(struct mm_struct *mm) {} | |
2321 | ||
5f22df00 | 2322 | #else |
1bb3630e | 2323 | int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address); |
dc6c9a35 | 2324 | |
dc6c9a35 KS |
2325 | static inline void mm_inc_nr_pmds(struct mm_struct *mm) |
2326 | { | |
6d212db1 MS |
2327 | if (mm_pmd_folded(mm)) |
2328 | return; | |
af5b0f6a | 2329 | atomic_long_add(PTRS_PER_PMD * sizeof(pmd_t), &mm->pgtables_bytes); |
dc6c9a35 KS |
2330 | } |
2331 | ||
2332 | static inline void mm_dec_nr_pmds(struct mm_struct *mm) | |
2333 | { | |
6d212db1 MS |
2334 | if (mm_pmd_folded(mm)) |
2335 | return; | |
af5b0f6a | 2336 | atomic_long_sub(PTRS_PER_PMD * sizeof(pmd_t), &mm->pgtables_bytes); |
dc6c9a35 | 2337 | } |
5f22df00 NP |
2338 | #endif |
2339 | ||
c4812909 | 2340 | #ifdef CONFIG_MMU |
af5b0f6a | 2341 | static inline void mm_pgtables_bytes_init(struct mm_struct *mm) |
c4812909 | 2342 | { |
af5b0f6a | 2343 | atomic_long_set(&mm->pgtables_bytes, 0); |
c4812909 KS |
2344 | } |
2345 | ||
af5b0f6a | 2346 | static inline unsigned long mm_pgtables_bytes(const struct mm_struct *mm) |
c4812909 | 2347 | { |
af5b0f6a | 2348 | return atomic_long_read(&mm->pgtables_bytes); |
c4812909 KS |
2349 | } |
2350 | ||
2351 | static inline void mm_inc_nr_ptes(struct mm_struct *mm) | |
2352 | { | |
af5b0f6a | 2353 | atomic_long_add(PTRS_PER_PTE * sizeof(pte_t), &mm->pgtables_bytes); |
c4812909 KS |
2354 | } |
2355 | ||
2356 | static inline void mm_dec_nr_ptes(struct mm_struct *mm) | |
2357 | { | |
af5b0f6a | 2358 | atomic_long_sub(PTRS_PER_PTE * sizeof(pte_t), &mm->pgtables_bytes); |
c4812909 KS |
2359 | } |
2360 | #else | |
c4812909 | 2361 | |
af5b0f6a KS |
2362 | static inline void mm_pgtables_bytes_init(struct mm_struct *mm) {} |
2363 | static inline unsigned long mm_pgtables_bytes(const struct mm_struct *mm) | |
c4812909 KS |
2364 | { |
2365 | return 0; | |
2366 | } | |
2367 | ||
2368 | static inline void mm_inc_nr_ptes(struct mm_struct *mm) {} | |
2369 | static inline void mm_dec_nr_ptes(struct mm_struct *mm) {} | |
2370 | #endif | |
2371 | ||
4cf58924 JFG |
2372 | int __pte_alloc(struct mm_struct *mm, pmd_t *pmd); |
2373 | int __pte_alloc_kernel(pmd_t *pmd); | |
1bb3630e | 2374 | |
f949286c MR |
2375 | #if defined(CONFIG_MMU) |
2376 | ||
c2febafc KS |
2377 | static inline p4d_t *p4d_alloc(struct mm_struct *mm, pgd_t *pgd, |
2378 | unsigned long address) | |
2379 | { | |
2380 | return (unlikely(pgd_none(*pgd)) && __p4d_alloc(mm, pgd, address)) ? | |
2381 | NULL : p4d_offset(pgd, address); | |
2382 | } | |
2383 | ||
2384 | static inline pud_t *pud_alloc(struct mm_struct *mm, p4d_t *p4d, | |
2385 | unsigned long address) | |
1da177e4 | 2386 | { |
c2febafc KS |
2387 | return (unlikely(p4d_none(*p4d)) && __pud_alloc(mm, p4d, address)) ? |
2388 | NULL : pud_offset(p4d, address); | |
1da177e4 | 2389 | } |
d8626138 | 2390 | |
1da177e4 LT |
2391 | static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address) |
2392 | { | |
1bb3630e HD |
2393 | return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address))? |
2394 | NULL: pmd_offset(pud, address); | |
1da177e4 | 2395 | } |
f949286c | 2396 | #endif /* CONFIG_MMU */ |
1bb3630e | 2397 | |
57c1ffce | 2398 | #if USE_SPLIT_PTE_PTLOCKS |
597d795a | 2399 | #if ALLOC_SPLIT_PTLOCKS |
b35f1819 | 2400 | void __init ptlock_cache_init(void); |
539edb58 PZ |
2401 | extern bool ptlock_alloc(struct page *page); |
2402 | extern void ptlock_free(struct page *page); | |
2403 | ||
2404 | static inline spinlock_t *ptlock_ptr(struct page *page) | |
2405 | { | |
2406 | return page->ptl; | |
2407 | } | |
597d795a | 2408 | #else /* ALLOC_SPLIT_PTLOCKS */ |
b35f1819 KS |
2409 | static inline void ptlock_cache_init(void) |
2410 | { | |
2411 | } | |
2412 | ||
49076ec2 KS |
2413 | static inline bool ptlock_alloc(struct page *page) |
2414 | { | |
49076ec2 KS |
2415 | return true; |
2416 | } | |
539edb58 | 2417 | |
49076ec2 KS |
2418 | static inline void ptlock_free(struct page *page) |
2419 | { | |
49076ec2 KS |
2420 | } |
2421 | ||
2422 | static inline spinlock_t *ptlock_ptr(struct page *page) | |
2423 | { | |
539edb58 | 2424 | return &page->ptl; |
49076ec2 | 2425 | } |
597d795a | 2426 | #endif /* ALLOC_SPLIT_PTLOCKS */ |
49076ec2 KS |
2427 | |
2428 | static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd) | |
2429 | { | |
2430 | return ptlock_ptr(pmd_page(*pmd)); | |
2431 | } | |
2432 | ||
2433 | static inline bool ptlock_init(struct page *page) | |
2434 | { | |
2435 | /* | |
2436 | * prep_new_page() initialize page->private (and therefore page->ptl) | |
2437 | * with 0. Make sure nobody took it in use in between. | |
2438 | * | |
2439 | * It can happen if arch try to use slab for page table allocation: | |
1d798ca3 | 2440 | * slab code uses page->slab_cache, which share storage with page->ptl. |
49076ec2 | 2441 | */ |
309381fe | 2442 | VM_BUG_ON_PAGE(*(unsigned long *)&page->ptl, page); |
49076ec2 KS |
2443 | if (!ptlock_alloc(page)) |
2444 | return false; | |
2445 | spin_lock_init(ptlock_ptr(page)); | |
2446 | return true; | |
2447 | } | |
2448 | ||
57c1ffce | 2449 | #else /* !USE_SPLIT_PTE_PTLOCKS */ |
4c21e2f2 HD |
2450 | /* |
2451 | * We use mm->page_table_lock to guard all pagetable pages of the mm. | |
2452 | */ | |
49076ec2 KS |
2453 | static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd) |
2454 | { | |
2455 | return &mm->page_table_lock; | |
2456 | } | |
b35f1819 | 2457 | static inline void ptlock_cache_init(void) {} |
49076ec2 | 2458 | static inline bool ptlock_init(struct page *page) { return true; } |
9e247bab | 2459 | static inline void ptlock_free(struct page *page) {} |
57c1ffce | 2460 | #endif /* USE_SPLIT_PTE_PTLOCKS */ |
4c21e2f2 | 2461 | |
b35f1819 KS |
2462 | static inline void pgtable_init(void) |
2463 | { | |
2464 | ptlock_cache_init(); | |
2465 | pgtable_cache_init(); | |
2466 | } | |
2467 | ||
b4ed71f5 | 2468 | static inline bool pgtable_pte_page_ctor(struct page *page) |
2f569afd | 2469 | { |
706874e9 VD |
2470 | if (!ptlock_init(page)) |
2471 | return false; | |
1d40a5ea | 2472 | __SetPageTable(page); |
f0c0c115 | 2473 | inc_lruvec_page_state(page, NR_PAGETABLE); |
706874e9 | 2474 | return true; |
2f569afd MS |
2475 | } |
2476 | ||
b4ed71f5 | 2477 | static inline void pgtable_pte_page_dtor(struct page *page) |
2f569afd | 2478 | { |
9e247bab | 2479 | ptlock_free(page); |
1d40a5ea | 2480 | __ClearPageTable(page); |
f0c0c115 | 2481 | dec_lruvec_page_state(page, NR_PAGETABLE); |
2f569afd MS |
2482 | } |
2483 | ||
c74df32c HD |
2484 | #define pte_offset_map_lock(mm, pmd, address, ptlp) \ |
2485 | ({ \ | |
4c21e2f2 | 2486 | spinlock_t *__ptl = pte_lockptr(mm, pmd); \ |
c74df32c HD |
2487 | pte_t *__pte = pte_offset_map(pmd, address); \ |
2488 | *(ptlp) = __ptl; \ | |
2489 | spin_lock(__ptl); \ | |
2490 | __pte; \ | |
2491 | }) | |
2492 | ||
2493 | #define pte_unmap_unlock(pte, ptl) do { \ | |
2494 | spin_unlock(ptl); \ | |
2495 | pte_unmap(pte); \ | |
2496 | } while (0) | |
2497 | ||
4cf58924 | 2498 | #define pte_alloc(mm, pmd) (unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, pmd)) |
3ed3a4f0 KS |
2499 | |
2500 | #define pte_alloc_map(mm, pmd, address) \ | |
4cf58924 | 2501 | (pte_alloc(mm, pmd) ? NULL : pte_offset_map(pmd, address)) |
1bb3630e | 2502 | |
c74df32c | 2503 | #define pte_alloc_map_lock(mm, pmd, address, ptlp) \ |
4cf58924 | 2504 | (pte_alloc(mm, pmd) ? \ |
3ed3a4f0 | 2505 | NULL : pte_offset_map_lock(mm, pmd, address, ptlp)) |
c74df32c | 2506 | |
1bb3630e | 2507 | #define pte_alloc_kernel(pmd, address) \ |
4cf58924 | 2508 | ((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd))? \ |
1bb3630e | 2509 | NULL: pte_offset_kernel(pmd, address)) |
1da177e4 | 2510 | |
e009bb30 KS |
2511 | #if USE_SPLIT_PMD_PTLOCKS |
2512 | ||
7e25de77 | 2513 | static inline struct page *pmd_pgtable_page(pmd_t *pmd) |
634391ac MS |
2514 | { |
2515 | unsigned long mask = ~(PTRS_PER_PMD * sizeof(pmd_t) - 1); | |
2516 | return virt_to_page((void *)((unsigned long) pmd & mask)); | |
2517 | } | |
2518 | ||
e009bb30 KS |
2519 | static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd) |
2520 | { | |
373dfda2 | 2521 | return ptlock_ptr(pmd_pgtable_page(pmd)); |
e009bb30 KS |
2522 | } |
2523 | ||
b2b29d6d | 2524 | static inline bool pmd_ptlock_init(struct page *page) |
e009bb30 | 2525 | { |
e009bb30 KS |
2526 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
2527 | page->pmd_huge_pte = NULL; | |
2528 | #endif | |
49076ec2 | 2529 | return ptlock_init(page); |
e009bb30 KS |
2530 | } |
2531 | ||
b2b29d6d | 2532 | static inline void pmd_ptlock_free(struct page *page) |
e009bb30 KS |
2533 | { |
2534 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
309381fe | 2535 | VM_BUG_ON_PAGE(page->pmd_huge_pte, page); |
e009bb30 | 2536 | #endif |
49076ec2 | 2537 | ptlock_free(page); |
e009bb30 KS |
2538 | } |
2539 | ||
373dfda2 | 2540 | #define pmd_huge_pte(mm, pmd) (pmd_pgtable_page(pmd)->pmd_huge_pte) |
e009bb30 KS |
2541 | |
2542 | #else | |
2543 | ||
9a86cb7b KS |
2544 | static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd) |
2545 | { | |
2546 | return &mm->page_table_lock; | |
2547 | } | |
2548 | ||
b2b29d6d MW |
2549 | static inline bool pmd_ptlock_init(struct page *page) { return true; } |
2550 | static inline void pmd_ptlock_free(struct page *page) {} | |
e009bb30 | 2551 | |
c389a250 | 2552 | #define pmd_huge_pte(mm, pmd) ((mm)->pmd_huge_pte) |
9a86cb7b | 2553 | |
e009bb30 KS |
2554 | #endif |
2555 | ||
9a86cb7b KS |
2556 | static inline spinlock_t *pmd_lock(struct mm_struct *mm, pmd_t *pmd) |
2557 | { | |
2558 | spinlock_t *ptl = pmd_lockptr(mm, pmd); | |
2559 | spin_lock(ptl); | |
2560 | return ptl; | |
2561 | } | |
2562 | ||
b2b29d6d MW |
2563 | static inline bool pgtable_pmd_page_ctor(struct page *page) |
2564 | { | |
2565 | if (!pmd_ptlock_init(page)) | |
2566 | return false; | |
2567 | __SetPageTable(page); | |
f0c0c115 | 2568 | inc_lruvec_page_state(page, NR_PAGETABLE); |
b2b29d6d MW |
2569 | return true; |
2570 | } | |
2571 | ||
2572 | static inline void pgtable_pmd_page_dtor(struct page *page) | |
2573 | { | |
2574 | pmd_ptlock_free(page); | |
2575 | __ClearPageTable(page); | |
f0c0c115 | 2576 | dec_lruvec_page_state(page, NR_PAGETABLE); |
b2b29d6d MW |
2577 | } |
2578 | ||
a00cc7d9 MW |
2579 | /* |
2580 | * No scalability reason to split PUD locks yet, but follow the same pattern | |
2581 | * as the PMD locks to make it easier if we decide to. The VM should not be | |
2582 | * considered ready to switch to split PUD locks yet; there may be places | |
2583 | * which need to be converted from page_table_lock. | |
2584 | */ | |
2585 | static inline spinlock_t *pud_lockptr(struct mm_struct *mm, pud_t *pud) | |
2586 | { | |
2587 | return &mm->page_table_lock; | |
2588 | } | |
2589 | ||
2590 | static inline spinlock_t *pud_lock(struct mm_struct *mm, pud_t *pud) | |
2591 | { | |
2592 | spinlock_t *ptl = pud_lockptr(mm, pud); | |
2593 | ||
2594 | spin_lock(ptl); | |
2595 | return ptl; | |
2596 | } | |
62906027 | 2597 | |
a00cc7d9 | 2598 | extern void __init pagecache_init(void); |
49a7f04a DH |
2599 | extern void free_initmem(void); |
2600 | ||
69afade7 JL |
2601 | /* |
2602 | * Free reserved pages within range [PAGE_ALIGN(start), end & PAGE_MASK) | |
2603 | * into the buddy system. The freed pages will be poisoned with pattern | |
dbe67df4 | 2604 | * "poison" if it's within range [0, UCHAR_MAX]. |
69afade7 JL |
2605 | * Return pages freed into the buddy system. |
2606 | */ | |
11199692 | 2607 | extern unsigned long free_reserved_area(void *start, void *end, |
e5cb113f | 2608 | int poison, const char *s); |
c3d5f5f0 | 2609 | |
c3d5f5f0 | 2610 | extern void adjust_managed_page_count(struct page *page, long count); |
1f9d03c5 | 2611 | extern void mem_init_print_info(void); |
69afade7 | 2612 | |
4b50bcc7 | 2613 | extern void reserve_bootmem_region(phys_addr_t start, phys_addr_t end); |
92923ca3 | 2614 | |
69afade7 | 2615 | /* Free the reserved page into the buddy system, so it gets managed. */ |
a0cd7a7c | 2616 | static inline void free_reserved_page(struct page *page) |
69afade7 JL |
2617 | { |
2618 | ClearPageReserved(page); | |
2619 | init_page_count(page); | |
2620 | __free_page(page); | |
69afade7 JL |
2621 | adjust_managed_page_count(page, 1); |
2622 | } | |
a0cd7a7c | 2623 | #define free_highmem_page(page) free_reserved_page(page) |
69afade7 JL |
2624 | |
2625 | static inline void mark_page_reserved(struct page *page) | |
2626 | { | |
2627 | SetPageReserved(page); | |
2628 | adjust_managed_page_count(page, -1); | |
2629 | } | |
2630 | ||
2631 | /* | |
2632 | * Default method to free all the __init memory into the buddy system. | |
dbe67df4 JL |
2633 | * The freed pages will be poisoned with pattern "poison" if it's within |
2634 | * range [0, UCHAR_MAX]. | |
2635 | * Return pages freed into the buddy system. | |
69afade7 JL |
2636 | */ |
2637 | static inline unsigned long free_initmem_default(int poison) | |
2638 | { | |
2639 | extern char __init_begin[], __init_end[]; | |
2640 | ||
11199692 | 2641 | return free_reserved_area(&__init_begin, &__init_end, |
c5a54c70 | 2642 | poison, "unused kernel image (initmem)"); |
69afade7 JL |
2643 | } |
2644 | ||
7ee3d4e8 JL |
2645 | static inline unsigned long get_num_physpages(void) |
2646 | { | |
2647 | int nid; | |
2648 | unsigned long phys_pages = 0; | |
2649 | ||
2650 | for_each_online_node(nid) | |
2651 | phys_pages += node_present_pages(nid); | |
2652 | ||
2653 | return phys_pages; | |
2654 | } | |
2655 | ||
c713216d | 2656 | /* |
3f08a302 | 2657 | * Using memblock node mappings, an architecture may initialise its |
bc9331a1 MR |
2658 | * zones, allocate the backing mem_map and account for memory holes in an |
2659 | * architecture independent manner. | |
c713216d MG |
2660 | * |
2661 | * An architecture is expected to register range of page frames backed by | |
0ee332c1 | 2662 | * physical memory with memblock_add[_node]() before calling |
9691a071 | 2663 | * free_area_init() passing in the PFN each zone ends at. At a basic |
c713216d MG |
2664 | * usage, an architecture is expected to do something like |
2665 | * | |
2666 | * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn, | |
2667 | * max_highmem_pfn}; | |
2668 | * for_each_valid_physical_page_range() | |
952eea9b | 2669 | * memblock_add_node(base, size, nid, MEMBLOCK_NONE) |
9691a071 | 2670 | * free_area_init(max_zone_pfns); |
c713216d | 2671 | */ |
9691a071 | 2672 | void free_area_init(unsigned long *max_zone_pfn); |
1e01979c | 2673 | unsigned long node_map_pfn_alignment(void); |
32996250 YL |
2674 | unsigned long __absent_pages_in_range(int nid, unsigned long start_pfn, |
2675 | unsigned long end_pfn); | |
c713216d MG |
2676 | extern unsigned long absent_pages_in_range(unsigned long start_pfn, |
2677 | unsigned long end_pfn); | |
2678 | extern void get_pfn_range_for_nid(unsigned int nid, | |
2679 | unsigned long *start_pfn, unsigned long *end_pfn); | |
f2dbcfa7 | 2680 | |
a9ee6cf5 | 2681 | #ifndef CONFIG_NUMA |
6f24fbd3 | 2682 | static inline int early_pfn_to_nid(unsigned long pfn) |
f2dbcfa7 KH |
2683 | { |
2684 | return 0; | |
2685 | } | |
2686 | #else | |
2687 | /* please see mm/page_alloc.c */ | |
2688 | extern int __meminit early_pfn_to_nid(unsigned long pfn); | |
f2dbcfa7 KH |
2689 | #endif |
2690 | ||
0e0b864e | 2691 | extern void set_dma_reserve(unsigned long new_dma_reserve); |
ab28cb6e | 2692 | extern void memmap_init_range(unsigned long, int, unsigned long, |
dc2da7b4 BH |
2693 | unsigned long, unsigned long, enum meminit_context, |
2694 | struct vmem_altmap *, int migratetype); | |
bc75d33f | 2695 | extern void setup_per_zone_wmarks(void); |
bd3400ea | 2696 | extern void calculate_min_free_kbytes(void); |
1b79acc9 | 2697 | extern int __meminit init_per_zone_wmark_min(void); |
1da177e4 | 2698 | extern void mem_init(void); |
8feae131 | 2699 | extern void __init mmap_init(void); |
974f4367 MH |
2700 | |
2701 | extern void __show_mem(unsigned int flags, nodemask_t *nodemask, int max_zone_idx); | |
2702 | static inline void show_mem(unsigned int flags, nodemask_t *nodemask) | |
2703 | { | |
2704 | __show_mem(flags, nodemask, MAX_NR_ZONES - 1); | |
2705 | } | |
d02bd27b | 2706 | extern long si_mem_available(void); |
1da177e4 LT |
2707 | extern void si_meminfo(struct sysinfo * val); |
2708 | extern void si_meminfo_node(struct sysinfo *val, int nid); | |
f6f34b43 SD |
2709 | #ifdef __HAVE_ARCH_RESERVED_KERNEL_PAGES |
2710 | extern unsigned long arch_reserved_kernel_pages(void); | |
2711 | #endif | |
1da177e4 | 2712 | |
a8e99259 MH |
2713 | extern __printf(3, 4) |
2714 | void warn_alloc(gfp_t gfp_mask, nodemask_t *nodemask, const char *fmt, ...); | |
a238ab5b | 2715 | |
e7c8d5c9 | 2716 | extern void setup_per_cpu_pageset(void); |
e7c8d5c9 | 2717 | |
75f7ad8e PS |
2718 | /* page_alloc.c */ |
2719 | extern int min_free_kbytes; | |
1c30844d | 2720 | extern int watermark_boost_factor; |
795ae7a0 | 2721 | extern int watermark_scale_factor; |
51930df5 | 2722 | extern bool arch_has_descending_max_zone_pfns(void); |
75f7ad8e | 2723 | |
8feae131 | 2724 | /* nommu.c */ |
33e5d769 | 2725 | extern atomic_long_t mmap_pages_allocated; |
7e660872 | 2726 | extern int nommu_shrink_inode_mappings(struct inode *, size_t, size_t); |
8feae131 | 2727 | |
6b2dbba8 | 2728 | /* interval_tree.c */ |
6b2dbba8 | 2729 | void vma_interval_tree_insert(struct vm_area_struct *node, |
f808c13f | 2730 | struct rb_root_cached *root); |
9826a516 ML |
2731 | void vma_interval_tree_insert_after(struct vm_area_struct *node, |
2732 | struct vm_area_struct *prev, | |
f808c13f | 2733 | struct rb_root_cached *root); |
6b2dbba8 | 2734 | void vma_interval_tree_remove(struct vm_area_struct *node, |
f808c13f DB |
2735 | struct rb_root_cached *root); |
2736 | struct vm_area_struct *vma_interval_tree_iter_first(struct rb_root_cached *root, | |
6b2dbba8 ML |
2737 | unsigned long start, unsigned long last); |
2738 | struct vm_area_struct *vma_interval_tree_iter_next(struct vm_area_struct *node, | |
2739 | unsigned long start, unsigned long last); | |
2740 | ||
2741 | #define vma_interval_tree_foreach(vma, root, start, last) \ | |
2742 | for (vma = vma_interval_tree_iter_first(root, start, last); \ | |
2743 | vma; vma = vma_interval_tree_iter_next(vma, start, last)) | |
1da177e4 | 2744 | |
bf181b9f | 2745 | void anon_vma_interval_tree_insert(struct anon_vma_chain *node, |
f808c13f | 2746 | struct rb_root_cached *root); |
bf181b9f | 2747 | void anon_vma_interval_tree_remove(struct anon_vma_chain *node, |
f808c13f DB |
2748 | struct rb_root_cached *root); |
2749 | struct anon_vma_chain * | |
2750 | anon_vma_interval_tree_iter_first(struct rb_root_cached *root, | |
2751 | unsigned long start, unsigned long last); | |
bf181b9f ML |
2752 | struct anon_vma_chain *anon_vma_interval_tree_iter_next( |
2753 | struct anon_vma_chain *node, unsigned long start, unsigned long last); | |
ed8ea815 ML |
2754 | #ifdef CONFIG_DEBUG_VM_RB |
2755 | void anon_vma_interval_tree_verify(struct anon_vma_chain *node); | |
2756 | #endif | |
bf181b9f ML |
2757 | |
2758 | #define anon_vma_interval_tree_foreach(avc, root, start, last) \ | |
2759 | for (avc = anon_vma_interval_tree_iter_first(root, start, last); \ | |
2760 | avc; avc = anon_vma_interval_tree_iter_next(avc, start, last)) | |
2761 | ||
1da177e4 | 2762 | /* mmap.c */ |
34b4e4aa | 2763 | extern int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin); |
e86f15ee AA |
2764 | extern int __vma_adjust(struct vm_area_struct *vma, unsigned long start, |
2765 | unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert, | |
2766 | struct vm_area_struct *expand); | |
2767 | static inline int vma_adjust(struct vm_area_struct *vma, unsigned long start, | |
2768 | unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert) | |
2769 | { | |
2770 | return __vma_adjust(vma, start, end, pgoff, insert, NULL); | |
2771 | } | |
1da177e4 LT |
2772 | extern struct vm_area_struct *vma_merge(struct mm_struct *, |
2773 | struct vm_area_struct *prev, unsigned long addr, unsigned long end, | |
2774 | unsigned long vm_flags, struct anon_vma *, struct file *, pgoff_t, | |
5c26f6ac | 2775 | struct mempolicy *, struct vm_userfaultfd_ctx, struct anon_vma_name *); |
1da177e4 | 2776 | extern struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *); |
def5efe0 DR |
2777 | extern int __split_vma(struct mm_struct *, struct vm_area_struct *, |
2778 | unsigned long addr, int new_below); | |
2779 | extern int split_vma(struct mm_struct *, struct vm_area_struct *, | |
2780 | unsigned long addr, int new_below); | |
1da177e4 | 2781 | extern int insert_vm_struct(struct mm_struct *, struct vm_area_struct *); |
a8fb5618 | 2782 | extern void unlink_file_vma(struct vm_area_struct *); |
1da177e4 | 2783 | extern struct vm_area_struct *copy_vma(struct vm_area_struct **, |
38a76013 ML |
2784 | unsigned long addr, unsigned long len, pgoff_t pgoff, |
2785 | bool *need_rmap_locks); | |
1da177e4 | 2786 | extern void exit_mmap(struct mm_struct *); |
925d1c40 | 2787 | |
d4af56c5 LH |
2788 | void vma_mas_store(struct vm_area_struct *vma, struct ma_state *mas); |
2789 | void vma_mas_remove(struct vm_area_struct *vma, struct ma_state *mas); | |
2790 | ||
9c599024 CG |
2791 | static inline int check_data_rlimit(unsigned long rlim, |
2792 | unsigned long new, | |
2793 | unsigned long start, | |
2794 | unsigned long end_data, | |
2795 | unsigned long start_data) | |
2796 | { | |
2797 | if (rlim < RLIM_INFINITY) { | |
2798 | if (((new - start) + (end_data - start_data)) > rlim) | |
2799 | return -ENOSPC; | |
2800 | } | |
2801 | ||
2802 | return 0; | |
2803 | } | |
2804 | ||
7906d00c AA |
2805 | extern int mm_take_all_locks(struct mm_struct *mm); |
2806 | extern void mm_drop_all_locks(struct mm_struct *mm); | |
2807 | ||
fe69d560 | 2808 | extern int set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file); |
35d7bdc8 | 2809 | extern int replace_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file); |
38646013 | 2810 | extern struct file *get_mm_exe_file(struct mm_struct *mm); |
cd81a917 | 2811 | extern struct file *get_task_exe_file(struct task_struct *task); |
925d1c40 | 2812 | |
84638335 KK |
2813 | extern bool may_expand_vm(struct mm_struct *, vm_flags_t, unsigned long npages); |
2814 | extern void vm_stat_account(struct mm_struct *, vm_flags_t, long npages); | |
2815 | ||
2eefd878 DS |
2816 | extern bool vma_is_special_mapping(const struct vm_area_struct *vma, |
2817 | const struct vm_special_mapping *sm); | |
3935ed6a SS |
2818 | extern struct vm_area_struct *_install_special_mapping(struct mm_struct *mm, |
2819 | unsigned long addr, unsigned long len, | |
a62c34bd AL |
2820 | unsigned long flags, |
2821 | const struct vm_special_mapping *spec); | |
2822 | /* This is an obsolete alternative to _install_special_mapping. */ | |
fa5dc22f RM |
2823 | extern int install_special_mapping(struct mm_struct *mm, |
2824 | unsigned long addr, unsigned long len, | |
2825 | unsigned long flags, struct page **pages); | |
1da177e4 | 2826 | |
649775be | 2827 | unsigned long randomize_stack_top(unsigned long stack_top); |
5ad7dd88 | 2828 | unsigned long randomize_page(unsigned long start, unsigned long range); |
649775be | 2829 | |
1da177e4 LT |
2830 | extern unsigned long get_unmapped_area(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); |
2831 | ||
0165ab44 | 2832 | extern unsigned long mmap_region(struct file *file, unsigned long addr, |
897ab3e0 MR |
2833 | unsigned long len, vm_flags_t vm_flags, unsigned long pgoff, |
2834 | struct list_head *uf); | |
1fcfd8db | 2835 | extern unsigned long do_mmap(struct file *file, unsigned long addr, |
bebeb3d6 | 2836 | unsigned long len, unsigned long prot, unsigned long flags, |
45e55300 | 2837 | unsigned long pgoff, unsigned long *populate, struct list_head *uf); |
11f9a21a LH |
2838 | extern int do_mas_munmap(struct ma_state *mas, struct mm_struct *mm, |
2839 | unsigned long start, size_t len, struct list_head *uf, | |
2840 | bool downgrade); | |
897ab3e0 MR |
2841 | extern int do_munmap(struct mm_struct *, unsigned long, size_t, |
2842 | struct list_head *uf); | |
0726b01e | 2843 | extern int do_madvise(struct mm_struct *mm, unsigned long start, size_t len_in, int behavior); |
1da177e4 | 2844 | |
bebeb3d6 ML |
2845 | #ifdef CONFIG_MMU |
2846 | extern int __mm_populate(unsigned long addr, unsigned long len, | |
2847 | int ignore_errors); | |
2848 | static inline void mm_populate(unsigned long addr, unsigned long len) | |
2849 | { | |
2850 | /* Ignore errors */ | |
2851 | (void) __mm_populate(addr, len, 1); | |
2852 | } | |
2853 | #else | |
2854 | static inline void mm_populate(unsigned long addr, unsigned long len) {} | |
2855 | #endif | |
2856 | ||
e4eb1ff6 | 2857 | /* These take the mm semaphore themselves */ |
5d22fc25 | 2858 | extern int __must_check vm_brk(unsigned long, unsigned long); |
16e72e9b | 2859 | extern int __must_check vm_brk_flags(unsigned long, unsigned long, unsigned long); |
bfce281c | 2860 | extern int vm_munmap(unsigned long, size_t); |
9fbeb5ab | 2861 | extern unsigned long __must_check vm_mmap(struct file *, unsigned long, |
6be5ceb0 LT |
2862 | unsigned long, unsigned long, |
2863 | unsigned long, unsigned long); | |
1da177e4 | 2864 | |
db4fbfb9 ML |
2865 | struct vm_unmapped_area_info { |
2866 | #define VM_UNMAPPED_AREA_TOPDOWN 1 | |
2867 | unsigned long flags; | |
2868 | unsigned long length; | |
2869 | unsigned long low_limit; | |
2870 | unsigned long high_limit; | |
2871 | unsigned long align_mask; | |
2872 | unsigned long align_offset; | |
2873 | }; | |
2874 | ||
baceaf1c | 2875 | extern unsigned long vm_unmapped_area(struct vm_unmapped_area_info *info); |
db4fbfb9 | 2876 | |
85821aab | 2877 | /* truncate.c */ |
1da177e4 | 2878 | extern void truncate_inode_pages(struct address_space *, loff_t); |
d7339071 HR |
2879 | extern void truncate_inode_pages_range(struct address_space *, |
2880 | loff_t lstart, loff_t lend); | |
91b0abe3 | 2881 | extern void truncate_inode_pages_final(struct address_space *); |
1da177e4 LT |
2882 | |
2883 | /* generic vm_area_ops exported for stackable file systems */ | |
2bcd6454 | 2884 | extern vm_fault_t filemap_fault(struct vm_fault *vmf); |
f9ce0be7 | 2885 | extern vm_fault_t filemap_map_pages(struct vm_fault *vmf, |
bae473a4 | 2886 | pgoff_t start_pgoff, pgoff_t end_pgoff); |
2bcd6454 | 2887 | extern vm_fault_t filemap_page_mkwrite(struct vm_fault *vmf); |
1da177e4 | 2888 | |
1be7107f | 2889 | extern unsigned long stack_guard_gap; |
d05f3169 | 2890 | /* Generic expand stack which grows the stack according to GROWS{UP,DOWN} */ |
46dea3d0 | 2891 | extern int expand_stack(struct vm_area_struct *vma, unsigned long address); |
d05f3169 | 2892 | |
11192337 | 2893 | /* CONFIG_STACK_GROWSUP still needs to grow downwards at some places */ |
d05f3169 MH |
2894 | extern int expand_downwards(struct vm_area_struct *vma, |
2895 | unsigned long address); | |
8ca3eb08 | 2896 | #if VM_GROWSUP |
46dea3d0 | 2897 | extern int expand_upwards(struct vm_area_struct *vma, unsigned long address); |
8ca3eb08 | 2898 | #else |
fee7e49d | 2899 | #define expand_upwards(vma, address) (0) |
9ab88515 | 2900 | #endif |
1da177e4 LT |
2901 | |
2902 | /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */ | |
2903 | extern struct vm_area_struct * find_vma(struct mm_struct * mm, unsigned long addr); | |
2904 | extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned long addr, | |
2905 | struct vm_area_struct **pprev); | |
2906 | ||
abdba2dd LH |
2907 | /* |
2908 | * Look up the first VMA which intersects the interval [start_addr, end_addr) | |
2909 | * NULL if none. Assume start_addr < end_addr. | |
ce6d42f2 | 2910 | */ |
ce6d42f2 | 2911 | struct vm_area_struct *find_vma_intersection(struct mm_struct *mm, |
abdba2dd | 2912 | unsigned long start_addr, unsigned long end_addr); |
1da177e4 | 2913 | |
ce6d42f2 LH |
2914 | /** |
2915 | * vma_lookup() - Find a VMA at a specific address | |
2916 | * @mm: The process address space. | |
2917 | * @addr: The user address. | |
2918 | * | |
2919 | * Return: The vm_area_struct at the given address, %NULL otherwise. | |
2920 | */ | |
2921 | static inline | |
2922 | struct vm_area_struct *vma_lookup(struct mm_struct *mm, unsigned long addr) | |
2923 | { | |
d7c62295 | 2924 | return mtree_load(&mm->mm_mt, addr); |
ce6d42f2 LH |
2925 | } |
2926 | ||
1be7107f HD |
2927 | static inline unsigned long vm_start_gap(struct vm_area_struct *vma) |
2928 | { | |
2929 | unsigned long vm_start = vma->vm_start; | |
2930 | ||
2931 | if (vma->vm_flags & VM_GROWSDOWN) { | |
2932 | vm_start -= stack_guard_gap; | |
2933 | if (vm_start > vma->vm_start) | |
2934 | vm_start = 0; | |
2935 | } | |
2936 | return vm_start; | |
2937 | } | |
2938 | ||
2939 | static inline unsigned long vm_end_gap(struct vm_area_struct *vma) | |
2940 | { | |
2941 | unsigned long vm_end = vma->vm_end; | |
2942 | ||
2943 | if (vma->vm_flags & VM_GROWSUP) { | |
2944 | vm_end += stack_guard_gap; | |
2945 | if (vm_end < vma->vm_end) | |
2946 | vm_end = -PAGE_SIZE; | |
2947 | } | |
2948 | return vm_end; | |
2949 | } | |
2950 | ||
1da177e4 LT |
2951 | static inline unsigned long vma_pages(struct vm_area_struct *vma) |
2952 | { | |
2953 | return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; | |
2954 | } | |
2955 | ||
640708a2 PE |
2956 | /* Look up the first VMA which exactly match the interval vm_start ... vm_end */ |
2957 | static inline struct vm_area_struct *find_exact_vma(struct mm_struct *mm, | |
2958 | unsigned long vm_start, unsigned long vm_end) | |
2959 | { | |
dc8635b2 | 2960 | struct vm_area_struct *vma = vma_lookup(mm, vm_start); |
640708a2 PE |
2961 | |
2962 | if (vma && (vma->vm_start != vm_start || vma->vm_end != vm_end)) | |
2963 | vma = NULL; | |
2964 | ||
2965 | return vma; | |
2966 | } | |
2967 | ||
017b1660 MK |
2968 | static inline bool range_in_vma(struct vm_area_struct *vma, |
2969 | unsigned long start, unsigned long end) | |
2970 | { | |
2971 | return (vma && vma->vm_start <= start && end <= vma->vm_end); | |
2972 | } | |
2973 | ||
bad849b3 | 2974 | #ifdef CONFIG_MMU |
804af2cf | 2975 | pgprot_t vm_get_page_prot(unsigned long vm_flags); |
64e45507 | 2976 | void vma_set_page_prot(struct vm_area_struct *vma); |
bad849b3 DH |
2977 | #else |
2978 | static inline pgprot_t vm_get_page_prot(unsigned long vm_flags) | |
2979 | { | |
2980 | return __pgprot(0); | |
2981 | } | |
64e45507 PF |
2982 | static inline void vma_set_page_prot(struct vm_area_struct *vma) |
2983 | { | |
2984 | vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); | |
2985 | } | |
bad849b3 DH |
2986 | #endif |
2987 | ||
295992fb CK |
2988 | void vma_set_file(struct vm_area_struct *vma, struct file *file); |
2989 | ||
5877231f | 2990 | #ifdef CONFIG_NUMA_BALANCING |
4b10e7d5 | 2991 | unsigned long change_prot_numa(struct vm_area_struct *vma, |
b24f53a0 LS |
2992 | unsigned long start, unsigned long end); |
2993 | #endif | |
2994 | ||
deceb6cd | 2995 | struct vm_area_struct *find_extend_vma(struct mm_struct *, unsigned long addr); |
deceb6cd HD |
2996 | int remap_pfn_range(struct vm_area_struct *, unsigned long addr, |
2997 | unsigned long pfn, unsigned long size, pgprot_t); | |
74ffa5a3 CH |
2998 | int remap_pfn_range_notrack(struct vm_area_struct *vma, unsigned long addr, |
2999 | unsigned long pfn, unsigned long size, pgprot_t prot); | |
a145dd41 | 3000 | int vm_insert_page(struct vm_area_struct *, unsigned long addr, struct page *); |
8cd3984d AR |
3001 | int vm_insert_pages(struct vm_area_struct *vma, unsigned long addr, |
3002 | struct page **pages, unsigned long *num); | |
a667d745 SJ |
3003 | int vm_map_pages(struct vm_area_struct *vma, struct page **pages, |
3004 | unsigned long num); | |
3005 | int vm_map_pages_zero(struct vm_area_struct *vma, struct page **pages, | |
3006 | unsigned long num); | |
ae2b01f3 | 3007 | vm_fault_t vmf_insert_pfn(struct vm_area_struct *vma, unsigned long addr, |
e0dc0d8f | 3008 | unsigned long pfn); |
f5e6d1d5 MW |
3009 | vm_fault_t vmf_insert_pfn_prot(struct vm_area_struct *vma, unsigned long addr, |
3010 | unsigned long pfn, pgprot_t pgprot); | |
5d747637 | 3011 | vm_fault_t vmf_insert_mixed(struct vm_area_struct *vma, unsigned long addr, |
01c8f1c4 | 3012 | pfn_t pfn); |
574c5b3d TH |
3013 | vm_fault_t vmf_insert_mixed_prot(struct vm_area_struct *vma, unsigned long addr, |
3014 | pfn_t pfn, pgprot_t pgprot); | |
ab77dab4 SJ |
3015 | vm_fault_t vmf_insert_mixed_mkwrite(struct vm_area_struct *vma, |
3016 | unsigned long addr, pfn_t pfn); | |
b4cbb197 LT |
3017 | int vm_iomap_memory(struct vm_area_struct *vma, phys_addr_t start, unsigned long len); |
3018 | ||
1c8f4220 SJ |
3019 | static inline vm_fault_t vmf_insert_page(struct vm_area_struct *vma, |
3020 | unsigned long addr, struct page *page) | |
3021 | { | |
3022 | int err = vm_insert_page(vma, addr, page); | |
3023 | ||
3024 | if (err == -ENOMEM) | |
3025 | return VM_FAULT_OOM; | |
3026 | if (err < 0 && err != -EBUSY) | |
3027 | return VM_FAULT_SIGBUS; | |
3028 | ||
3029 | return VM_FAULT_NOPAGE; | |
3030 | } | |
3031 | ||
f8f6ae5d JG |
3032 | #ifndef io_remap_pfn_range |
3033 | static inline int io_remap_pfn_range(struct vm_area_struct *vma, | |
3034 | unsigned long addr, unsigned long pfn, | |
3035 | unsigned long size, pgprot_t prot) | |
3036 | { | |
3037 | return remap_pfn_range(vma, addr, pfn, size, pgprot_decrypted(prot)); | |
3038 | } | |
3039 | #endif | |
3040 | ||
d97baf94 SJ |
3041 | static inline vm_fault_t vmf_error(int err) |
3042 | { | |
3043 | if (err == -ENOMEM) | |
3044 | return VM_FAULT_OOM; | |
3045 | return VM_FAULT_SIGBUS; | |
3046 | } | |
3047 | ||
df06b37f KB |
3048 | struct page *follow_page(struct vm_area_struct *vma, unsigned long address, |
3049 | unsigned int foll_flags); | |
240aadee | 3050 | |
deceb6cd HD |
3051 | #define FOLL_WRITE 0x01 /* check pte is writable */ |
3052 | #define FOLL_TOUCH 0x02 /* mark page accessed */ | |
3053 | #define FOLL_GET 0x04 /* do get_page on page */ | |
8e4b9a60 | 3054 | #define FOLL_DUMP 0x08 /* give error on hole if it would be zero */ |
58fa879e | 3055 | #define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */ |
318b275f GN |
3056 | #define FOLL_NOWAIT 0x20 /* if a disk transfer is needed, start the IO |
3057 | * and return without waiting upon it */ | |
55b8fe70 | 3058 | #define FOLL_NOFAULT 0x80 /* do not fault in pages */ |
69ebb83e | 3059 | #define FOLL_HWPOISON 0x100 /* check page is hwpoisoned */ |
234b239b | 3060 | #define FOLL_TRIED 0x800 /* a retry, previous pass started an IO */ |
1e987790 | 3061 | #define FOLL_REMOTE 0x2000 /* we are working on non-current tsk/mm */ |
7f7ccc2c | 3062 | #define FOLL_ANON 0x8000 /* don't do file mappings */ |
932f4a63 | 3063 | #define FOLL_LONGTERM 0x10000 /* mapping lifetime is indefinite: see below */ |
bfe7b00d | 3064 | #define FOLL_SPLIT_PMD 0x20000 /* split huge pmd before returning */ |
f1f6a7dd | 3065 | #define FOLL_PIN 0x40000 /* pages must be released via unpin_user_page */ |
376a34ef | 3066 | #define FOLL_FAST_ONLY 0x80000 /* gup_fast: prevent fall-back to slow gup */ |
932f4a63 IW |
3067 | |
3068 | /* | |
eddb1c22 JH |
3069 | * FOLL_PIN and FOLL_LONGTERM may be used in various combinations with each |
3070 | * other. Here is what they mean, and how to use them: | |
932f4a63 IW |
3071 | * |
3072 | * FOLL_LONGTERM indicates that the page will be held for an indefinite time | |
eddb1c22 JH |
3073 | * period _often_ under userspace control. This is in contrast to |
3074 | * iov_iter_get_pages(), whose usages are transient. | |
932f4a63 IW |
3075 | * |
3076 | * FIXME: For pages which are part of a filesystem, mappings are subject to the | |
3077 | * lifetime enforced by the filesystem and we need guarantees that longterm | |
3078 | * users like RDMA and V4L2 only establish mappings which coordinate usage with | |
3079 | * the filesystem. Ideas for this coordination include revoking the longterm | |
3080 | * pin, delaying writeback, bounce buffer page writeback, etc. As FS DAX was | |
3081 | * added after the problem with filesystems was found FS DAX VMAs are | |
3082 | * specifically failed. Filesystem pages are still subject to bugs and use of | |
3083 | * FOLL_LONGTERM should be avoided on those pages. | |
3084 | * | |
3085 | * FIXME: Also NOTE that FOLL_LONGTERM is not supported in every GUP call. | |
3086 | * Currently only get_user_pages() and get_user_pages_fast() support this flag | |
3087 | * and calls to get_user_pages_[un]locked are specifically not allowed. This | |
3088 | * is due to an incompatibility with the FS DAX check and | |
eddb1c22 | 3089 | * FAULT_FLAG_ALLOW_RETRY. |
932f4a63 | 3090 | * |
eddb1c22 JH |
3091 | * In the CMA case: long term pins in a CMA region would unnecessarily fragment |
3092 | * that region. And so, CMA attempts to migrate the page before pinning, when | |
932f4a63 | 3093 | * FOLL_LONGTERM is specified. |
eddb1c22 JH |
3094 | * |
3095 | * FOLL_PIN indicates that a special kind of tracking (not just page->_refcount, | |
3096 | * but an additional pin counting system) will be invoked. This is intended for | |
3097 | * anything that gets a page reference and then touches page data (for example, | |
3098 | * Direct IO). This lets the filesystem know that some non-file-system entity is | |
3099 | * potentially changing the pages' data. In contrast to FOLL_GET (whose pages | |
3100 | * are released via put_page()), FOLL_PIN pages must be released, ultimately, by | |
f1f6a7dd | 3101 | * a call to unpin_user_page(). |
eddb1c22 JH |
3102 | * |
3103 | * FOLL_PIN is similar to FOLL_GET: both of these pin pages. They use different | |
3104 | * and separate refcounting mechanisms, however, and that means that each has | |
3105 | * its own acquire and release mechanisms: | |
3106 | * | |
3107 | * FOLL_GET: get_user_pages*() to acquire, and put_page() to release. | |
3108 | * | |
f1f6a7dd | 3109 | * FOLL_PIN: pin_user_pages*() to acquire, and unpin_user_pages to release. |
eddb1c22 JH |
3110 | * |
3111 | * FOLL_PIN and FOLL_GET are mutually exclusive for a given function call. | |
3112 | * (The underlying pages may experience both FOLL_GET-based and FOLL_PIN-based | |
3113 | * calls applied to them, and that's perfectly OK. This is a constraint on the | |
3114 | * callers, not on the pages.) | |
3115 | * | |
3116 | * FOLL_PIN should be set internally by the pin_user_pages*() APIs, never | |
3117 | * directly by the caller. That's in order to help avoid mismatches when | |
3118 | * releasing pages: get_user_pages*() pages must be released via put_page(), | |
f1f6a7dd | 3119 | * while pin_user_pages*() pages must be released via unpin_user_page(). |
eddb1c22 | 3120 | * |
72ef5e52 | 3121 | * Please see Documentation/core-api/pin_user_pages.rst for more information. |
932f4a63 | 3122 | */ |
1da177e4 | 3123 | |
2b740303 | 3124 | static inline int vm_fault_to_errno(vm_fault_t vm_fault, int foll_flags) |
9a291a7c JM |
3125 | { |
3126 | if (vm_fault & VM_FAULT_OOM) | |
3127 | return -ENOMEM; | |
3128 | if (vm_fault & (VM_FAULT_HWPOISON | VM_FAULT_HWPOISON_LARGE)) | |
3129 | return (foll_flags & FOLL_HWPOISON) ? -EHWPOISON : -EFAULT; | |
3130 | if (vm_fault & (VM_FAULT_SIGBUS | VM_FAULT_SIGSEGV)) | |
3131 | return -EFAULT; | |
3132 | return 0; | |
3133 | } | |
3134 | ||
a7f22660 DH |
3135 | /* |
3136 | * Indicates for which pages that are write-protected in the page table, | |
3137 | * whether GUP has to trigger unsharing via FAULT_FLAG_UNSHARE such that the | |
3138 | * GUP pin will remain consistent with the pages mapped into the page tables | |
3139 | * of the MM. | |
3140 | * | |
3141 | * Temporary unmapping of PageAnonExclusive() pages or clearing of | |
3142 | * PageAnonExclusive() has to protect against concurrent GUP: | |
3143 | * * Ordinary GUP: Using the PT lock | |
3144 | * * GUP-fast and fork(): mm->write_protect_seq | |
088b8aa5 DH |
3145 | * * GUP-fast and KSM or temporary unmapping (swap, migration): see |
3146 | * page_try_share_anon_rmap() | |
a7f22660 DH |
3147 | * |
3148 | * Must be called with the (sub)page that's actually referenced via the | |
3149 | * page table entry, which might not necessarily be the head page for a | |
3150 | * PTE-mapped THP. | |
84209e87 DH |
3151 | * |
3152 | * If the vma is NULL, we're coming from the GUP-fast path and might have | |
3153 | * to fallback to the slow path just to lookup the vma. | |
a7f22660 | 3154 | */ |
84209e87 DH |
3155 | static inline bool gup_must_unshare(struct vm_area_struct *vma, |
3156 | unsigned int flags, struct page *page) | |
a7f22660 DH |
3157 | { |
3158 | /* | |
3159 | * FOLL_WRITE is implicitly handled correctly as the page table entry | |
3160 | * has to be writable -- and if it references (part of) an anonymous | |
3161 | * folio, that part is required to be marked exclusive. | |
3162 | */ | |
3163 | if ((flags & (FOLL_WRITE | FOLL_PIN)) != FOLL_PIN) | |
3164 | return false; | |
3165 | /* | |
3166 | * Note: PageAnon(page) is stable until the page is actually getting | |
3167 | * freed. | |
3168 | */ | |
84209e87 DH |
3169 | if (!PageAnon(page)) { |
3170 | /* | |
3171 | * We only care about R/O long-term pining: R/O short-term | |
3172 | * pinning does not have the semantics to observe successive | |
3173 | * changes through the process page tables. | |
3174 | */ | |
3175 | if (!(flags & FOLL_LONGTERM)) | |
3176 | return false; | |
3177 | ||
3178 | /* We really need the vma ... */ | |
3179 | if (!vma) | |
3180 | return true; | |
3181 | ||
3182 | /* | |
3183 | * ... because we only care about writable private ("COW") | |
3184 | * mappings where we have to break COW early. | |
3185 | */ | |
3186 | return is_cow_mapping(vma->vm_flags); | |
3187 | } | |
088b8aa5 DH |
3188 | |
3189 | /* Paired with a memory barrier in page_try_share_anon_rmap(). */ | |
3190 | if (IS_ENABLED(CONFIG_HAVE_FAST_GUP)) | |
3191 | smp_rmb(); | |
3192 | ||
a7f22660 DH |
3193 | /* |
3194 | * Note that PageKsm() pages cannot be exclusive, and consequently, | |
3195 | * cannot get pinned. | |
3196 | */ | |
3197 | return !PageAnonExclusive(page); | |
3198 | } | |
3199 | ||
474098ed DH |
3200 | /* |
3201 | * Indicates whether GUP can follow a PROT_NONE mapped page, or whether | |
3202 | * a (NUMA hinting) fault is required. | |
3203 | */ | |
3204 | static inline bool gup_can_follow_protnone(unsigned int flags) | |
3205 | { | |
3206 | /* | |
3207 | * FOLL_FORCE has to be able to make progress even if the VMA is | |
3208 | * inaccessible. Further, FOLL_FORCE access usually does not represent | |
3209 | * application behaviour and we should avoid triggering NUMA hinting | |
3210 | * faults. | |
3211 | */ | |
3212 | return flags & FOLL_FORCE; | |
3213 | } | |
3214 | ||
8b1e0f81 | 3215 | typedef int (*pte_fn_t)(pte_t *pte, unsigned long addr, void *data); |
aee16b3c JF |
3216 | extern int apply_to_page_range(struct mm_struct *mm, unsigned long address, |
3217 | unsigned long size, pte_fn_t fn, void *data); | |
be1db475 DA |
3218 | extern int apply_to_existing_page_range(struct mm_struct *mm, |
3219 | unsigned long address, unsigned long size, | |
3220 | pte_fn_t fn, void *data); | |
aee16b3c | 3221 | |
5749fcc5 | 3222 | extern void __init init_mem_debugging_and_hardening(void); |
8823b1db | 3223 | #ifdef CONFIG_PAGE_POISONING |
8db26a3d VB |
3224 | extern void __kernel_poison_pages(struct page *page, int numpages); |
3225 | extern void __kernel_unpoison_pages(struct page *page, int numpages); | |
3226 | extern bool _page_poisoning_enabled_early; | |
3227 | DECLARE_STATIC_KEY_FALSE(_page_poisoning_enabled); | |
3228 | static inline bool page_poisoning_enabled(void) | |
3229 | { | |
3230 | return _page_poisoning_enabled_early; | |
3231 | } | |
3232 | /* | |
3233 | * For use in fast paths after init_mem_debugging() has run, or when a | |
3234 | * false negative result is not harmful when called too early. | |
3235 | */ | |
3236 | static inline bool page_poisoning_enabled_static(void) | |
3237 | { | |
3238 | return static_branch_unlikely(&_page_poisoning_enabled); | |
3239 | } | |
3240 | static inline void kernel_poison_pages(struct page *page, int numpages) | |
3241 | { | |
3242 | if (page_poisoning_enabled_static()) | |
3243 | __kernel_poison_pages(page, numpages); | |
3244 | } | |
3245 | static inline void kernel_unpoison_pages(struct page *page, int numpages) | |
3246 | { | |
3247 | if (page_poisoning_enabled_static()) | |
3248 | __kernel_unpoison_pages(page, numpages); | |
3249 | } | |
8823b1db LA |
3250 | #else |
3251 | static inline bool page_poisoning_enabled(void) { return false; } | |
8db26a3d | 3252 | static inline bool page_poisoning_enabled_static(void) { return false; } |
03b6c9a3 | 3253 | static inline void __kernel_poison_pages(struct page *page, int nunmpages) { } |
8db26a3d VB |
3254 | static inline void kernel_poison_pages(struct page *page, int numpages) { } |
3255 | static inline void kernel_unpoison_pages(struct page *page, int numpages) { } | |
8823b1db LA |
3256 | #endif |
3257 | ||
51cba1eb | 3258 | DECLARE_STATIC_KEY_MAYBE(CONFIG_INIT_ON_ALLOC_DEFAULT_ON, init_on_alloc); |
6471384a AP |
3259 | static inline bool want_init_on_alloc(gfp_t flags) |
3260 | { | |
51cba1eb KC |
3261 | if (static_branch_maybe(CONFIG_INIT_ON_ALLOC_DEFAULT_ON, |
3262 | &init_on_alloc)) | |
6471384a AP |
3263 | return true; |
3264 | return flags & __GFP_ZERO; | |
3265 | } | |
3266 | ||
51cba1eb | 3267 | DECLARE_STATIC_KEY_MAYBE(CONFIG_INIT_ON_FREE_DEFAULT_ON, init_on_free); |
6471384a AP |
3268 | static inline bool want_init_on_free(void) |
3269 | { | |
51cba1eb KC |
3270 | return static_branch_maybe(CONFIG_INIT_ON_FREE_DEFAULT_ON, |
3271 | &init_on_free); | |
6471384a AP |
3272 | } |
3273 | ||
8e57f8ac VB |
3274 | extern bool _debug_pagealloc_enabled_early; |
3275 | DECLARE_STATIC_KEY_FALSE(_debug_pagealloc_enabled); | |
031bc574 JK |
3276 | |
3277 | static inline bool debug_pagealloc_enabled(void) | |
8e57f8ac VB |
3278 | { |
3279 | return IS_ENABLED(CONFIG_DEBUG_PAGEALLOC) && | |
3280 | _debug_pagealloc_enabled_early; | |
3281 | } | |
3282 | ||
3283 | /* | |
3284 | * For use in fast paths after init_debug_pagealloc() has run, or when a | |
3285 | * false negative result is not harmful when called too early. | |
3286 | */ | |
3287 | static inline bool debug_pagealloc_enabled_static(void) | |
031bc574 | 3288 | { |
96a2b03f VB |
3289 | if (!IS_ENABLED(CONFIG_DEBUG_PAGEALLOC)) |
3290 | return false; | |
3291 | ||
3292 | return static_branch_unlikely(&_debug_pagealloc_enabled); | |
031bc574 JK |
3293 | } |
3294 | ||
5d6ad668 | 3295 | #ifdef CONFIG_DEBUG_PAGEALLOC |
c87cbc1f | 3296 | /* |
5d6ad668 MR |
3297 | * To support DEBUG_PAGEALLOC architecture must ensure that |
3298 | * __kernel_map_pages() never fails | |
c87cbc1f | 3299 | */ |
d6332692 RE |
3300 | extern void __kernel_map_pages(struct page *page, int numpages, int enable); |
3301 | ||
77bc7fd6 MR |
3302 | static inline void debug_pagealloc_map_pages(struct page *page, int numpages) |
3303 | { | |
3304 | if (debug_pagealloc_enabled_static()) | |
3305 | __kernel_map_pages(page, numpages, 1); | |
3306 | } | |
3307 | ||
3308 | static inline void debug_pagealloc_unmap_pages(struct page *page, int numpages) | |
3309 | { | |
3310 | if (debug_pagealloc_enabled_static()) | |
3311 | __kernel_map_pages(page, numpages, 0); | |
3312 | } | |
5d6ad668 | 3313 | #else /* CONFIG_DEBUG_PAGEALLOC */ |
77bc7fd6 MR |
3314 | static inline void debug_pagealloc_map_pages(struct page *page, int numpages) {} |
3315 | static inline void debug_pagealloc_unmap_pages(struct page *page, int numpages) {} | |
5d6ad668 | 3316 | #endif /* CONFIG_DEBUG_PAGEALLOC */ |
1da177e4 | 3317 | |
a6c19dfe | 3318 | #ifdef __HAVE_ARCH_GATE_AREA |
31db58b3 | 3319 | extern struct vm_area_struct *get_gate_vma(struct mm_struct *mm); |
a6c19dfe AL |
3320 | extern int in_gate_area_no_mm(unsigned long addr); |
3321 | extern int in_gate_area(struct mm_struct *mm, unsigned long addr); | |
1da177e4 | 3322 | #else |
a6c19dfe AL |
3323 | static inline struct vm_area_struct *get_gate_vma(struct mm_struct *mm) |
3324 | { | |
3325 | return NULL; | |
3326 | } | |
3327 | static inline int in_gate_area_no_mm(unsigned long addr) { return 0; } | |
3328 | static inline int in_gate_area(struct mm_struct *mm, unsigned long addr) | |
3329 | { | |
3330 | return 0; | |
3331 | } | |
1da177e4 LT |
3332 | #endif /* __HAVE_ARCH_GATE_AREA */ |
3333 | ||
44a70ade MH |
3334 | extern bool process_shares_mm(struct task_struct *p, struct mm_struct *mm); |
3335 | ||
146732ce JT |
3336 | #ifdef CONFIG_SYSCTL |
3337 | extern int sysctl_drop_caches; | |
32927393 CH |
3338 | int drop_caches_sysctl_handler(struct ctl_table *, int, void *, size_t *, |
3339 | loff_t *); | |
146732ce JT |
3340 | #endif |
3341 | ||
cb731d6c | 3342 | void drop_slab(void); |
9d0243bc | 3343 | |
7a9166e3 LY |
3344 | #ifndef CONFIG_MMU |
3345 | #define randomize_va_space 0 | |
3346 | #else | |
a62eaf15 | 3347 | extern int randomize_va_space; |
7a9166e3 | 3348 | #endif |
a62eaf15 | 3349 | |
045e72ac | 3350 | const char * arch_vma_name(struct vm_area_struct *vma); |
89165b8b | 3351 | #ifdef CONFIG_MMU |
03252919 | 3352 | void print_vma_addr(char *prefix, unsigned long rip); |
89165b8b CH |
3353 | #else |
3354 | static inline void print_vma_addr(char *prefix, unsigned long rip) | |
3355 | { | |
3356 | } | |
3357 | #endif | |
e6e5494c | 3358 | |
35fd1eb1 | 3359 | void *sparse_buffer_alloc(unsigned long size); |
e9c0a3f0 | 3360 | struct page * __populate_section_memmap(unsigned long pfn, |
e3246d8f JM |
3361 | unsigned long nr_pages, int nid, struct vmem_altmap *altmap, |
3362 | struct dev_pagemap *pgmap); | |
7b09f5af FC |
3363 | void pmd_init(void *addr); |
3364 | void pud_init(void *addr); | |
29c71111 | 3365 | pgd_t *vmemmap_pgd_populate(unsigned long addr, int node); |
c2febafc KS |
3366 | p4d_t *vmemmap_p4d_populate(pgd_t *pgd, unsigned long addr, int node); |
3367 | pud_t *vmemmap_pud_populate(p4d_t *p4d, unsigned long addr, int node); | |
29c71111 | 3368 | pmd_t *vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node); |
1d9cfee7 | 3369 | pte_t *vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node, |
4917f55b | 3370 | struct vmem_altmap *altmap, struct page *reuse); |
8f6aac41 | 3371 | void *vmemmap_alloc_block(unsigned long size, int node); |
4b94ffdc | 3372 | struct vmem_altmap; |
56993b4e AK |
3373 | void *vmemmap_alloc_block_buf(unsigned long size, int node, |
3374 | struct vmem_altmap *altmap); | |
8f6aac41 | 3375 | void vmemmap_verify(pte_t *, int, unsigned long, unsigned long); |
0aad818b | 3376 | int vmemmap_populate_basepages(unsigned long start, unsigned long end, |
1d9cfee7 | 3377 | int node, struct vmem_altmap *altmap); |
7b73d978 CH |
3378 | int vmemmap_populate(unsigned long start, unsigned long end, int node, |
3379 | struct vmem_altmap *altmap); | |
c2b91e2e | 3380 | void vmemmap_populate_print_last(void); |
0197518c | 3381 | #ifdef CONFIG_MEMORY_HOTPLUG |
24b6d416 CH |
3382 | void vmemmap_free(unsigned long start, unsigned long end, |
3383 | struct vmem_altmap *altmap); | |
0197518c | 3384 | #endif |
46723bfa | 3385 | void register_page_bootmem_memmap(unsigned long section_nr, struct page *map, |
15670bfe | 3386 | unsigned long nr_pages); |
6a46079c | 3387 | |
82ba011b AK |
3388 | enum mf_flags { |
3389 | MF_COUNT_INCREASED = 1 << 0, | |
7329bbeb | 3390 | MF_ACTION_REQUIRED = 1 << 1, |
6751ed65 | 3391 | MF_MUST_KILL = 1 << 2, |
cf870c70 | 3392 | MF_SOFT_OFFLINE = 1 << 3, |
bf181c58 | 3393 | MF_UNPOISON = 1 << 4, |
67f22ba7 | 3394 | MF_SW_SIMULATED = 1 << 5, |
38f6d293 | 3395 | MF_NO_RETRY = 1 << 6, |
82ba011b | 3396 | }; |
c36e2024 SR |
3397 | int mf_dax_kill_procs(struct address_space *mapping, pgoff_t index, |
3398 | unsigned long count, int mf_flags); | |
83b57531 | 3399 | extern int memory_failure(unsigned long pfn, int flags); |
06202231 | 3400 | extern void memory_failure_queue_kick(int cpu); |
847ce401 | 3401 | extern int unpoison_memory(unsigned long pfn); |
6a46079c AK |
3402 | extern int sysctl_memory_failure_early_kill; |
3403 | extern int sysctl_memory_failure_recovery; | |
d0505e9f | 3404 | extern void shake_page(struct page *p); |
5844a486 | 3405 | extern atomic_long_t num_poisoned_pages __read_mostly; |
feec24a6 | 3406 | extern int soft_offline_page(unsigned long pfn, int flags); |
405ce051 | 3407 | #ifdef CONFIG_MEMORY_FAILURE |
d302c239 | 3408 | extern void memory_failure_queue(unsigned long pfn, int flags); |
e591ef7d NH |
3409 | extern int __get_huge_page_for_hwpoison(unsigned long pfn, int flags, |
3410 | bool *migratable_cleared); | |
5033091d NH |
3411 | void num_poisoned_pages_inc(unsigned long pfn); |
3412 | void num_poisoned_pages_sub(unsigned long pfn, long i); | |
405ce051 | 3413 | #else |
d302c239 TL |
3414 | static inline void memory_failure_queue(unsigned long pfn, int flags) |
3415 | { | |
3416 | } | |
3417 | ||
e591ef7d NH |
3418 | static inline int __get_huge_page_for_hwpoison(unsigned long pfn, int flags, |
3419 | bool *migratable_cleared) | |
405ce051 NH |
3420 | { |
3421 | return 0; | |
3422 | } | |
d027122d | 3423 | |
a46c9304 | 3424 | static inline void num_poisoned_pages_inc(unsigned long pfn) |
d027122d NH |
3425 | { |
3426 | } | |
5033091d NH |
3427 | |
3428 | static inline void num_poisoned_pages_sub(unsigned long pfn, long i) | |
3429 | { | |
3430 | } | |
3431 | #endif | |
3432 | ||
3433 | #if defined(CONFIG_MEMORY_FAILURE) && defined(CONFIG_MEMORY_HOTPLUG) | |
3434 | extern void memblk_nr_poison_inc(unsigned long pfn); | |
3435 | extern void memblk_nr_poison_sub(unsigned long pfn, long i); | |
3436 | #else | |
3437 | static inline void memblk_nr_poison_inc(unsigned long pfn) | |
3438 | { | |
3439 | } | |
3440 | ||
3441 | static inline void memblk_nr_poison_sub(unsigned long pfn, long i) | |
3442 | { | |
3443 | } | |
405ce051 | 3444 | #endif |
6a46079c | 3445 | |
03b122da TL |
3446 | #ifndef arch_memory_failure |
3447 | static inline int arch_memory_failure(unsigned long pfn, int flags) | |
3448 | { | |
3449 | return -ENXIO; | |
3450 | } | |
3451 | #endif | |
3452 | ||
3453 | #ifndef arch_is_platform_page | |
3454 | static inline bool arch_is_platform_page(u64 paddr) | |
3455 | { | |
3456 | return false; | |
3457 | } | |
3458 | #endif | |
cc637b17 XX |
3459 | |
3460 | /* | |
3461 | * Error handlers for various types of pages. | |
3462 | */ | |
cc3e2af4 | 3463 | enum mf_result { |
cc637b17 XX |
3464 | MF_IGNORED, /* Error: cannot be handled */ |
3465 | MF_FAILED, /* Error: handling failed */ | |
3466 | MF_DELAYED, /* Will be handled later */ | |
3467 | MF_RECOVERED, /* Successfully recovered */ | |
3468 | }; | |
3469 | ||
3470 | enum mf_action_page_type { | |
3471 | MF_MSG_KERNEL, | |
3472 | MF_MSG_KERNEL_HIGH_ORDER, | |
3473 | MF_MSG_SLAB, | |
3474 | MF_MSG_DIFFERENT_COMPOUND, | |
cc637b17 XX |
3475 | MF_MSG_HUGE, |
3476 | MF_MSG_FREE_HUGE, | |
3477 | MF_MSG_UNMAP_FAILED, | |
3478 | MF_MSG_DIRTY_SWAPCACHE, | |
3479 | MF_MSG_CLEAN_SWAPCACHE, | |
3480 | MF_MSG_DIRTY_MLOCKED_LRU, | |
3481 | MF_MSG_CLEAN_MLOCKED_LRU, | |
3482 | MF_MSG_DIRTY_UNEVICTABLE_LRU, | |
3483 | MF_MSG_CLEAN_UNEVICTABLE_LRU, | |
3484 | MF_MSG_DIRTY_LRU, | |
3485 | MF_MSG_CLEAN_LRU, | |
3486 | MF_MSG_TRUNCATED_LRU, | |
3487 | MF_MSG_BUDDY, | |
6100e34b | 3488 | MF_MSG_DAX, |
5d1fd5dc | 3489 | MF_MSG_UNSPLIT_THP, |
cc637b17 XX |
3490 | MF_MSG_UNKNOWN, |
3491 | }; | |
3492 | ||
47ad8475 AA |
3493 | #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS) |
3494 | extern void clear_huge_page(struct page *page, | |
c79b57e4 | 3495 | unsigned long addr_hint, |
47ad8475 AA |
3496 | unsigned int pages_per_huge_page); |
3497 | extern void copy_user_huge_page(struct page *dst, struct page *src, | |
c9f4cd71 HY |
3498 | unsigned long addr_hint, |
3499 | struct vm_area_struct *vma, | |
47ad8475 | 3500 | unsigned int pages_per_huge_page); |
fa4d75c1 MK |
3501 | extern long copy_huge_page_from_user(struct page *dst_page, |
3502 | const void __user *usr_src, | |
810a56b9 MK |
3503 | unsigned int pages_per_huge_page, |
3504 | bool allow_pagefault); | |
2484ca9b THV |
3505 | |
3506 | /** | |
3507 | * vma_is_special_huge - Are transhuge page-table entries considered special? | |
3508 | * @vma: Pointer to the struct vm_area_struct to consider | |
3509 | * | |
3510 | * Whether transhuge page-table entries are considered "special" following | |
3511 | * the definition in vm_normal_page(). | |
3512 | * | |
3513 | * Return: true if transhuge page-table entries should be considered special, | |
3514 | * false otherwise. | |
3515 | */ | |
3516 | static inline bool vma_is_special_huge(const struct vm_area_struct *vma) | |
3517 | { | |
3518 | return vma_is_dax(vma) || (vma->vm_file && | |
3519 | (vma->vm_flags & (VM_PFNMAP | VM_MIXEDMAP))); | |
3520 | } | |
3521 | ||
47ad8475 AA |
3522 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */ |
3523 | ||
c0a32fc5 SG |
3524 | #ifdef CONFIG_DEBUG_PAGEALLOC |
3525 | extern unsigned int _debug_guardpage_minorder; | |
96a2b03f | 3526 | DECLARE_STATIC_KEY_FALSE(_debug_guardpage_enabled); |
c0a32fc5 SG |
3527 | |
3528 | static inline unsigned int debug_guardpage_minorder(void) | |
3529 | { | |
3530 | return _debug_guardpage_minorder; | |
3531 | } | |
3532 | ||
e30825f1 JK |
3533 | static inline bool debug_guardpage_enabled(void) |
3534 | { | |
96a2b03f | 3535 | return static_branch_unlikely(&_debug_guardpage_enabled); |
e30825f1 JK |
3536 | } |
3537 | ||
c0a32fc5 SG |
3538 | static inline bool page_is_guard(struct page *page) |
3539 | { | |
e30825f1 JK |
3540 | if (!debug_guardpage_enabled()) |
3541 | return false; | |
3542 | ||
3972f6bb | 3543 | return PageGuard(page); |
c0a32fc5 SG |
3544 | } |
3545 | #else | |
3546 | static inline unsigned int debug_guardpage_minorder(void) { return 0; } | |
e30825f1 | 3547 | static inline bool debug_guardpage_enabled(void) { return false; } |
c0a32fc5 SG |
3548 | static inline bool page_is_guard(struct page *page) { return false; } |
3549 | #endif /* CONFIG_DEBUG_PAGEALLOC */ | |
3550 | ||
f9872caf CS |
3551 | #if MAX_NUMNODES > 1 |
3552 | void __init setup_nr_node_ids(void); | |
3553 | #else | |
3554 | static inline void setup_nr_node_ids(void) {} | |
3555 | #endif | |
3556 | ||
010c164a SL |
3557 | extern int memcmp_pages(struct page *page1, struct page *page2); |
3558 | ||
3559 | static inline int pages_identical(struct page *page1, struct page *page2) | |
3560 | { | |
3561 | return !memcmp_pages(page1, page2); | |
3562 | } | |
3563 | ||
c5acad84 TH |
3564 | #ifdef CONFIG_MAPPING_DIRTY_HELPERS |
3565 | unsigned long clean_record_shared_mapping_range(struct address_space *mapping, | |
3566 | pgoff_t first_index, pgoff_t nr, | |
3567 | pgoff_t bitmap_pgoff, | |
3568 | unsigned long *bitmap, | |
3569 | pgoff_t *start, | |
3570 | pgoff_t *end); | |
3571 | ||
3572 | unsigned long wp_shared_mapping_range(struct address_space *mapping, | |
3573 | pgoff_t first_index, pgoff_t nr); | |
3574 | #endif | |
3575 | ||
2374c09b CH |
3576 | extern int sysctl_nr_trim_pages; |
3577 | ||
5bb1bb35 | 3578 | #ifdef CONFIG_PRINTK |
8e7f37f2 | 3579 | void mem_dump_obj(void *object); |
5bb1bb35 PM |
3580 | #else |
3581 | static inline void mem_dump_obj(void *object) {} | |
3582 | #endif | |
8e7f37f2 | 3583 | |
22247efd PX |
3584 | /** |
3585 | * seal_check_future_write - Check for F_SEAL_FUTURE_WRITE flag and handle it | |
3586 | * @seals: the seals to check | |
3587 | * @vma: the vma to operate on | |
3588 | * | |
3589 | * Check whether F_SEAL_FUTURE_WRITE is set; if so, do proper check/handling on | |
3590 | * the vma flags. Return 0 if check pass, or <0 for errors. | |
3591 | */ | |
3592 | static inline int seal_check_future_write(int seals, struct vm_area_struct *vma) | |
3593 | { | |
3594 | if (seals & F_SEAL_FUTURE_WRITE) { | |
3595 | /* | |
3596 | * New PROT_WRITE and MAP_SHARED mmaps are not allowed when | |
3597 | * "future write" seal active. | |
3598 | */ | |
3599 | if ((vma->vm_flags & VM_SHARED) && (vma->vm_flags & VM_WRITE)) | |
3600 | return -EPERM; | |
3601 | ||
3602 | /* | |
3603 | * Since an F_SEAL_FUTURE_WRITE sealed memfd can be mapped as | |
3604 | * MAP_SHARED and read-only, take care to not allow mprotect to | |
3605 | * revert protections on such mappings. Do this only for shared | |
3606 | * mappings. For private mappings, don't need to mask | |
3607 | * VM_MAYWRITE as we still want them to be COW-writable. | |
3608 | */ | |
3609 | if (vma->vm_flags & VM_SHARED) | |
3610 | vma->vm_flags &= ~(VM_MAYWRITE); | |
3611 | } | |
3612 | ||
3613 | return 0; | |
3614 | } | |
3615 | ||
9a10064f CC |
3616 | #ifdef CONFIG_ANON_VMA_NAME |
3617 | int madvise_set_anon_name(struct mm_struct *mm, unsigned long start, | |
5c26f6ac SB |
3618 | unsigned long len_in, |
3619 | struct anon_vma_name *anon_name); | |
9a10064f CC |
3620 | #else |
3621 | static inline int | |
3622 | madvise_set_anon_name(struct mm_struct *mm, unsigned long start, | |
5c26f6ac | 3623 | unsigned long len_in, struct anon_vma_name *anon_name) { |
9a10064f CC |
3624 | return 0; |
3625 | } | |
3626 | #endif | |
3627 | ||
1da177e4 | 3628 | #endif /* _LINUX_MM_H */ |