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 LT |
5 | #include <linux/errno.h> |
6 | ||
7 | #ifdef __KERNEL__ | |
8 | ||
309381fe | 9 | #include <linux/mmdebug.h> |
1da177e4 | 10 | #include <linux/gfp.h> |
187f1882 | 11 | #include <linux/bug.h> |
1da177e4 LT |
12 | #include <linux/list.h> |
13 | #include <linux/mmzone.h> | |
14 | #include <linux/rbtree.h> | |
83aeeada | 15 | #include <linux/atomic.h> |
9a11b49a | 16 | #include <linux/debug_locks.h> |
5b99cd0e | 17 | #include <linux/mm_types.h> |
9740ca4e | 18 | #include <linux/mmap_lock.h> |
08677214 | 19 | #include <linux/range.h> |
c6f6b596 | 20 | #include <linux/pfn.h> |
3565fce3 | 21 | #include <linux/percpu-refcount.h> |
e9da73d6 | 22 | #include <linux/bit_spinlock.h> |
b0d40c92 | 23 | #include <linux/shrinker.h> |
9c599024 | 24 | #include <linux/resource.h> |
e30825f1 | 25 | #include <linux/page_ext.h> |
8025e5dd | 26 | #include <linux/err.h> |
41901567 | 27 | #include <linux/page-flags.h> |
fe896d18 | 28 | #include <linux/page_ref.h> |
7b2d55d2 | 29 | #include <linux/memremap.h> |
3b3b1a29 | 30 | #include <linux/overflow.h> |
b5420237 | 31 | #include <linux/sizes.h> |
7969f226 | 32 | #include <linux/sched.h> |
65fddcfc | 33 | #include <linux/pgtable.h> |
34303244 | 34 | #include <linux/kasan.h> |
1da177e4 LT |
35 | |
36 | struct mempolicy; | |
37 | struct anon_vma; | |
bf181b9f | 38 | struct anon_vma_chain; |
4e950f6f | 39 | struct file_ra_state; |
e8edc6e0 | 40 | struct user_struct; |
4e950f6f | 41 | struct writeback_control; |
682aa8e1 | 42 | struct bdi_writeback; |
bce617ed | 43 | struct pt_regs; |
1da177e4 | 44 | |
5ef64cc8 LT |
45 | extern int sysctl_page_lock_unfairness; |
46 | ||
597b7305 MH |
47 | void init_mm_internals(void); |
48 | ||
a9ee6cf5 | 49 | #ifndef CONFIG_NUMA /* Don't use mapnrs, do it properly */ |
1da177e4 | 50 | extern unsigned long max_mapnr; |
fccc9987 JL |
51 | |
52 | static inline void set_max_mapnr(unsigned long limit) | |
53 | { | |
54 | max_mapnr = limit; | |
55 | } | |
56 | #else | |
57 | static inline void set_max_mapnr(unsigned long limit) { } | |
1da177e4 LT |
58 | #endif |
59 | ||
ca79b0c2 AK |
60 | extern atomic_long_t _totalram_pages; |
61 | static inline unsigned long totalram_pages(void) | |
62 | { | |
63 | return (unsigned long)atomic_long_read(&_totalram_pages); | |
64 | } | |
65 | ||
66 | static inline void totalram_pages_inc(void) | |
67 | { | |
68 | atomic_long_inc(&_totalram_pages); | |
69 | } | |
70 | ||
71 | static inline void totalram_pages_dec(void) | |
72 | { | |
73 | atomic_long_dec(&_totalram_pages); | |
74 | } | |
75 | ||
76 | static inline void totalram_pages_add(long count) | |
77 | { | |
78 | atomic_long_add(count, &_totalram_pages); | |
79 | } | |
80 | ||
1da177e4 | 81 | extern void * high_memory; |
1da177e4 LT |
82 | extern int page_cluster; |
83 | ||
84 | #ifdef CONFIG_SYSCTL | |
85 | extern int sysctl_legacy_va_layout; | |
86 | #else | |
87 | #define sysctl_legacy_va_layout 0 | |
88 | #endif | |
89 | ||
d07e2259 DC |
90 | #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS |
91 | extern const int mmap_rnd_bits_min; | |
92 | extern const int mmap_rnd_bits_max; | |
93 | extern int mmap_rnd_bits __read_mostly; | |
94 | #endif | |
95 | #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS | |
96 | extern const int mmap_rnd_compat_bits_min; | |
97 | extern const int mmap_rnd_compat_bits_max; | |
98 | extern int mmap_rnd_compat_bits __read_mostly; | |
99 | #endif | |
100 | ||
1da177e4 | 101 | #include <asm/page.h> |
1da177e4 | 102 | #include <asm/processor.h> |
1da177e4 | 103 | |
d9344522 AK |
104 | /* |
105 | * Architectures that support memory tagging (assigning tags to memory regions, | |
106 | * embedding these tags into addresses that point to these memory regions, and | |
107 | * checking that the memory and the pointer tags match on memory accesses) | |
108 | * redefine this macro to strip tags from pointers. | |
f0953a1b | 109 | * It's defined as noop for architectures that don't support memory tagging. |
d9344522 AK |
110 | */ |
111 | #ifndef untagged_addr | |
112 | #define untagged_addr(addr) (addr) | |
113 | #endif | |
114 | ||
79442ed1 TC |
115 | #ifndef __pa_symbol |
116 | #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0)) | |
117 | #endif | |
118 | ||
1dff8083 AB |
119 | #ifndef page_to_virt |
120 | #define page_to_virt(x) __va(PFN_PHYS(page_to_pfn(x))) | |
121 | #endif | |
122 | ||
568c5fe5 LA |
123 | #ifndef lm_alias |
124 | #define lm_alias(x) __va(__pa_symbol(x)) | |
125 | #endif | |
126 | ||
593befa6 DD |
127 | /* |
128 | * To prevent common memory management code establishing | |
129 | * a zero page mapping on a read fault. | |
130 | * This macro should be defined within <asm/pgtable.h>. | |
131 | * s390 does this to prevent multiplexing of hardware bits | |
132 | * related to the physical page in case of virtualization. | |
133 | */ | |
134 | #ifndef mm_forbids_zeropage | |
135 | #define mm_forbids_zeropage(X) (0) | |
136 | #endif | |
137 | ||
a4a3ede2 PT |
138 | /* |
139 | * On some architectures it is expensive to call memset() for small sizes. | |
5470dea4 AD |
140 | * If an architecture decides to implement their own version of |
141 | * mm_zero_struct_page they should wrap the defines below in a #ifndef and | |
142 | * define their own version of this macro in <asm/pgtable.h> | |
a4a3ede2 | 143 | */ |
5470dea4 AD |
144 | #if BITS_PER_LONG == 64 |
145 | /* This function must be updated when the size of struct page grows above 80 | |
146 | * or reduces below 56. The idea that compiler optimizes out switch() | |
147 | * statement, and only leaves move/store instructions. Also the compiler can | |
c4ffefd1 | 148 | * combine write statements if they are both assignments and can be reordered, |
5470dea4 AD |
149 | * this can result in several of the writes here being dropped. |
150 | */ | |
151 | #define mm_zero_struct_page(pp) __mm_zero_struct_page(pp) | |
152 | static inline void __mm_zero_struct_page(struct page *page) | |
153 | { | |
154 | unsigned long *_pp = (void *)page; | |
155 | ||
156 | /* Check that struct page is either 56, 64, 72, or 80 bytes */ | |
157 | BUILD_BUG_ON(sizeof(struct page) & 7); | |
158 | BUILD_BUG_ON(sizeof(struct page) < 56); | |
159 | BUILD_BUG_ON(sizeof(struct page) > 80); | |
160 | ||
161 | switch (sizeof(struct page)) { | |
162 | case 80: | |
df561f66 GS |
163 | _pp[9] = 0; |
164 | fallthrough; | |
5470dea4 | 165 | case 72: |
df561f66 GS |
166 | _pp[8] = 0; |
167 | fallthrough; | |
5470dea4 | 168 | case 64: |
df561f66 GS |
169 | _pp[7] = 0; |
170 | fallthrough; | |
5470dea4 AD |
171 | case 56: |
172 | _pp[6] = 0; | |
173 | _pp[5] = 0; | |
174 | _pp[4] = 0; | |
175 | _pp[3] = 0; | |
176 | _pp[2] = 0; | |
177 | _pp[1] = 0; | |
178 | _pp[0] = 0; | |
179 | } | |
180 | } | |
181 | #else | |
a4a3ede2 PT |
182 | #define mm_zero_struct_page(pp) ((void)memset((pp), 0, sizeof(struct page))) |
183 | #endif | |
184 | ||
ea606cf5 AR |
185 | /* |
186 | * Default maximum number of active map areas, this limits the number of vmas | |
187 | * per mm struct. Users can overwrite this number by sysctl but there is a | |
188 | * problem. | |
189 | * | |
190 | * When a program's coredump is generated as ELF format, a section is created | |
191 | * per a vma. In ELF, the number of sections is represented in unsigned short. | |
192 | * This means the number of sections should be smaller than 65535 at coredump. | |
193 | * Because the kernel adds some informative sections to a image of program at | |
194 | * generating coredump, we need some margin. The number of extra sections is | |
195 | * 1-3 now and depends on arch. We use "5" as safe margin, here. | |
196 | * | |
197 | * ELF extended numbering allows more than 65535 sections, so 16-bit bound is | |
198 | * not a hard limit any more. Although some userspace tools can be surprised by | |
199 | * that. | |
200 | */ | |
201 | #define MAPCOUNT_ELF_CORE_MARGIN (5) | |
202 | #define DEFAULT_MAX_MAP_COUNT (USHRT_MAX - MAPCOUNT_ELF_CORE_MARGIN) | |
203 | ||
204 | extern int sysctl_max_map_count; | |
205 | ||
c9b1d098 | 206 | extern unsigned long sysctl_user_reserve_kbytes; |
4eeab4f5 | 207 | extern unsigned long sysctl_admin_reserve_kbytes; |
c9b1d098 | 208 | |
49f0ce5f JM |
209 | extern int sysctl_overcommit_memory; |
210 | extern int sysctl_overcommit_ratio; | |
211 | extern unsigned long sysctl_overcommit_kbytes; | |
212 | ||
32927393 CH |
213 | int overcommit_ratio_handler(struct ctl_table *, int, void *, size_t *, |
214 | loff_t *); | |
215 | int overcommit_kbytes_handler(struct ctl_table *, int, void *, size_t *, | |
216 | loff_t *); | |
56f3547b FT |
217 | int overcommit_policy_handler(struct ctl_table *, int, void *, size_t *, |
218 | loff_t *); | |
6d87d0ec SJ |
219 | /* |
220 | * Any attempt to mark this function as static leads to build failure | |
221 | * when CONFIG_DEBUG_INFO_BTF is enabled because __add_to_page_cache_locked() | |
222 | * is referred to by BPF code. This must be visible for error injection. | |
223 | */ | |
224 | int __add_to_page_cache_locked(struct page *page, struct address_space *mapping, | |
225 | pgoff_t index, gfp_t gfp, void **shadowp); | |
49f0ce5f | 226 | |
1cfcee72 | 227 | #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP) |
1da177e4 | 228 | #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n)) |
1cfcee72 MWO |
229 | #else |
230 | #define nth_page(page,n) ((page) + (n)) | |
231 | #endif | |
1da177e4 | 232 | |
27ac792c AR |
233 | /* to align the pointer to the (next) page boundary */ |
234 | #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE) | |
235 | ||
0fa73b86 | 236 | /* test whether an address (unsigned long or pointer) is aligned to PAGE_SIZE */ |
1061b0d2 | 237 | #define PAGE_ALIGNED(addr) IS_ALIGNED((unsigned long)(addr), PAGE_SIZE) |
0fa73b86 | 238 | |
f86196ea NB |
239 | #define lru_to_page(head) (list_entry((head)->prev, struct page, lru)) |
240 | ||
5748fbc5 KW |
241 | void setup_initial_init_mm(void *start_code, void *end_code, |
242 | void *end_data, void *brk); | |
243 | ||
1da177e4 LT |
244 | /* |
245 | * Linux kernel virtual memory manager primitives. | |
246 | * The idea being to have a "virtual" mm in the same way | |
247 | * we have a virtual fs - giving a cleaner interface to the | |
248 | * mm details, and allowing different kinds of memory mappings | |
249 | * (from shared memory to executable loading to arbitrary | |
250 | * mmap() functions). | |
251 | */ | |
252 | ||
490fc053 | 253 | struct vm_area_struct *vm_area_alloc(struct mm_struct *); |
3928d4f5 LT |
254 | struct vm_area_struct *vm_area_dup(struct vm_area_struct *); |
255 | void vm_area_free(struct vm_area_struct *); | |
c43692e8 | 256 | |
1da177e4 | 257 | #ifndef CONFIG_MMU |
8feae131 DH |
258 | extern struct rb_root nommu_region_tree; |
259 | extern struct rw_semaphore nommu_region_sem; | |
1da177e4 LT |
260 | |
261 | extern unsigned int kobjsize(const void *objp); | |
262 | #endif | |
263 | ||
264 | /* | |
605d9288 | 265 | * vm_flags in vm_area_struct, see mm_types.h. |
bcf66917 | 266 | * When changing, update also include/trace/events/mmflags.h |
1da177e4 | 267 | */ |
cc2383ec KK |
268 | #define VM_NONE 0x00000000 |
269 | ||
1da177e4 LT |
270 | #define VM_READ 0x00000001 /* currently active flags */ |
271 | #define VM_WRITE 0x00000002 | |
272 | #define VM_EXEC 0x00000004 | |
273 | #define VM_SHARED 0x00000008 | |
274 | ||
7e2cff42 | 275 | /* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */ |
1da177e4 LT |
276 | #define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */ |
277 | #define VM_MAYWRITE 0x00000020 | |
278 | #define VM_MAYEXEC 0x00000040 | |
279 | #define VM_MAYSHARE 0x00000080 | |
280 | ||
281 | #define VM_GROWSDOWN 0x00000100 /* general info on the segment */ | |
16ba6f81 | 282 | #define VM_UFFD_MISSING 0x00000200 /* missing pages tracking */ |
6aab341e | 283 | #define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */ |
16ba6f81 | 284 | #define VM_UFFD_WP 0x00001000 /* wrprotect pages tracking */ |
1da177e4 | 285 | |
1da177e4 LT |
286 | #define VM_LOCKED 0x00002000 |
287 | #define VM_IO 0x00004000 /* Memory mapped I/O or similar */ | |
288 | ||
289 | /* Used by sys_madvise() */ | |
290 | #define VM_SEQ_READ 0x00008000 /* App will access data sequentially */ | |
291 | #define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */ | |
292 | ||
293 | #define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */ | |
294 | #define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */ | |
de60f5f1 | 295 | #define VM_LOCKONFAULT 0x00080000 /* Lock the pages covered when they are faulted in */ |
1da177e4 | 296 | #define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */ |
cdfd4325 | 297 | #define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */ |
1da177e4 | 298 | #define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */ |
b6fb293f | 299 | #define VM_SYNC 0x00800000 /* Synchronous page faults */ |
cc2383ec | 300 | #define VM_ARCH_1 0x01000000 /* Architecture-specific flag */ |
d2cd9ede | 301 | #define VM_WIPEONFORK 0x02000000 /* Wipe VMA contents in child. */ |
0103bd16 | 302 | #define VM_DONTDUMP 0x04000000 /* Do not include in the core dump */ |
d00806b1 | 303 | |
d9104d1c CG |
304 | #ifdef CONFIG_MEM_SOFT_DIRTY |
305 | # define VM_SOFTDIRTY 0x08000000 /* Not soft dirty clean area */ | |
306 | #else | |
307 | # define VM_SOFTDIRTY 0 | |
308 | #endif | |
309 | ||
b379d790 | 310 | #define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */ |
cc2383ec KK |
311 | #define VM_HUGEPAGE 0x20000000 /* MADV_HUGEPAGE marked this vma */ |
312 | #define VM_NOHUGEPAGE 0x40000000 /* MADV_NOHUGEPAGE marked this vma */ | |
f8af4da3 | 313 | #define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */ |
1da177e4 | 314 | |
63c17fb8 DH |
315 | #ifdef CONFIG_ARCH_USES_HIGH_VMA_FLAGS |
316 | #define VM_HIGH_ARCH_BIT_0 32 /* bit only usable on 64-bit architectures */ | |
317 | #define VM_HIGH_ARCH_BIT_1 33 /* bit only usable on 64-bit architectures */ | |
318 | #define VM_HIGH_ARCH_BIT_2 34 /* bit only usable on 64-bit architectures */ | |
319 | #define VM_HIGH_ARCH_BIT_3 35 /* bit only usable on 64-bit architectures */ | |
df3735c5 | 320 | #define VM_HIGH_ARCH_BIT_4 36 /* bit only usable on 64-bit architectures */ |
63c17fb8 DH |
321 | #define VM_HIGH_ARCH_0 BIT(VM_HIGH_ARCH_BIT_0) |
322 | #define VM_HIGH_ARCH_1 BIT(VM_HIGH_ARCH_BIT_1) | |
323 | #define VM_HIGH_ARCH_2 BIT(VM_HIGH_ARCH_BIT_2) | |
324 | #define VM_HIGH_ARCH_3 BIT(VM_HIGH_ARCH_BIT_3) | |
df3735c5 | 325 | #define VM_HIGH_ARCH_4 BIT(VM_HIGH_ARCH_BIT_4) |
63c17fb8 DH |
326 | #endif /* CONFIG_ARCH_USES_HIGH_VMA_FLAGS */ |
327 | ||
5212213a | 328 | #ifdef CONFIG_ARCH_HAS_PKEYS |
8f62c883 DH |
329 | # define VM_PKEY_SHIFT VM_HIGH_ARCH_BIT_0 |
330 | # define VM_PKEY_BIT0 VM_HIGH_ARCH_0 /* A protection key is a 4-bit value */ | |
2c9e0a6f | 331 | # define VM_PKEY_BIT1 VM_HIGH_ARCH_1 /* on x86 and 5-bit value on ppc64 */ |
8f62c883 DH |
332 | # define VM_PKEY_BIT2 VM_HIGH_ARCH_2 |
333 | # define VM_PKEY_BIT3 VM_HIGH_ARCH_3 | |
2c9e0a6f RP |
334 | #ifdef CONFIG_PPC |
335 | # define VM_PKEY_BIT4 VM_HIGH_ARCH_4 | |
336 | #else | |
337 | # define VM_PKEY_BIT4 0 | |
8f62c883 | 338 | #endif |
5212213a RP |
339 | #endif /* CONFIG_ARCH_HAS_PKEYS */ |
340 | ||
341 | #if defined(CONFIG_X86) | |
342 | # define VM_PAT VM_ARCH_1 /* PAT reserves whole VMA at once (x86) */ | |
12564485 SA |
343 | #elif defined(CONFIG_PPC) |
344 | # define VM_SAO VM_ARCH_1 /* Strong Access Ordering (powerpc) */ | |
cc2383ec KK |
345 | #elif defined(CONFIG_PARISC) |
346 | # define VM_GROWSUP VM_ARCH_1 | |
347 | #elif defined(CONFIG_IA64) | |
348 | # define VM_GROWSUP VM_ARCH_1 | |
74a04967 KA |
349 | #elif defined(CONFIG_SPARC64) |
350 | # define VM_SPARC_ADI VM_ARCH_1 /* Uses ADI tag for access control */ | |
351 | # define VM_ARCH_CLEAR VM_SPARC_ADI | |
8ef8f360 DM |
352 | #elif defined(CONFIG_ARM64) |
353 | # define VM_ARM64_BTI VM_ARCH_1 /* BTI guarded page, a.k.a. GP bit */ | |
354 | # define VM_ARCH_CLEAR VM_ARM64_BTI | |
cc2383ec KK |
355 | #elif !defined(CONFIG_MMU) |
356 | # define VM_MAPPED_COPY VM_ARCH_1 /* T if mapped copy of data (nommu mmap) */ | |
357 | #endif | |
358 | ||
9f341931 CM |
359 | #if defined(CONFIG_ARM64_MTE) |
360 | # define VM_MTE VM_HIGH_ARCH_0 /* Use Tagged memory for access control */ | |
361 | # define VM_MTE_ALLOWED VM_HIGH_ARCH_1 /* Tagged memory permitted */ | |
362 | #else | |
363 | # define VM_MTE VM_NONE | |
364 | # define VM_MTE_ALLOWED VM_NONE | |
365 | #endif | |
366 | ||
cc2383ec KK |
367 | #ifndef VM_GROWSUP |
368 | # define VM_GROWSUP VM_NONE | |
369 | #endif | |
370 | ||
7677f7fd AR |
371 | #ifdef CONFIG_HAVE_ARCH_USERFAULTFD_MINOR |
372 | # define VM_UFFD_MINOR_BIT 37 | |
373 | # define VM_UFFD_MINOR BIT(VM_UFFD_MINOR_BIT) /* UFFD minor faults */ | |
374 | #else /* !CONFIG_HAVE_ARCH_USERFAULTFD_MINOR */ | |
375 | # define VM_UFFD_MINOR VM_NONE | |
376 | #endif /* CONFIG_HAVE_ARCH_USERFAULTFD_MINOR */ | |
377 | ||
a8bef8ff MG |
378 | /* Bits set in the VMA until the stack is in its final location */ |
379 | #define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ) | |
380 | ||
c62da0c3 AK |
381 | #define TASK_EXEC ((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) |
382 | ||
383 | /* Common data flag combinations */ | |
384 | #define VM_DATA_FLAGS_TSK_EXEC (VM_READ | VM_WRITE | TASK_EXEC | \ | |
385 | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) | |
386 | #define VM_DATA_FLAGS_NON_EXEC (VM_READ | VM_WRITE | VM_MAYREAD | \ | |
387 | VM_MAYWRITE | VM_MAYEXEC) | |
388 | #define VM_DATA_FLAGS_EXEC (VM_READ | VM_WRITE | VM_EXEC | \ | |
389 | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) | |
390 | ||
391 | #ifndef VM_DATA_DEFAULT_FLAGS /* arch can override this */ | |
392 | #define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_EXEC | |
393 | #endif | |
394 | ||
1da177e4 LT |
395 | #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */ |
396 | #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS | |
397 | #endif | |
398 | ||
399 | #ifdef CONFIG_STACK_GROWSUP | |
30bdbb78 | 400 | #define VM_STACK VM_GROWSUP |
1da177e4 | 401 | #else |
30bdbb78 | 402 | #define VM_STACK VM_GROWSDOWN |
1da177e4 LT |
403 | #endif |
404 | ||
30bdbb78 KK |
405 | #define VM_STACK_FLAGS (VM_STACK | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT) |
406 | ||
6cb4d9a2 AK |
407 | /* VMA basic access permission flags */ |
408 | #define VM_ACCESS_FLAGS (VM_READ | VM_WRITE | VM_EXEC) | |
409 | ||
410 | ||
b291f000 | 411 | /* |
78f11a25 | 412 | * Special vmas that are non-mergable, non-mlock()able. |
b291f000 | 413 | */ |
9050d7eb | 414 | #define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_PFNMAP | VM_MIXEDMAP) |
b291f000 | 415 | |
b4443772 AK |
416 | /* This mask prevents VMA from being scanned with khugepaged */ |
417 | #define VM_NO_KHUGEPAGED (VM_SPECIAL | VM_HUGETLB) | |
418 | ||
a0715cc2 AT |
419 | /* This mask defines which mm->def_flags a process can inherit its parent */ |
420 | #define VM_INIT_DEF_MASK VM_NOHUGEPAGE | |
421 | ||
de60f5f1 EM |
422 | /* This mask is used to clear all the VMA flags used by mlock */ |
423 | #define VM_LOCKED_CLEAR_MASK (~(VM_LOCKED | VM_LOCKONFAULT)) | |
424 | ||
2c2d57b5 KA |
425 | /* Arch-specific flags to clear when updating VM flags on protection change */ |
426 | #ifndef VM_ARCH_CLEAR | |
427 | # define VM_ARCH_CLEAR VM_NONE | |
428 | #endif | |
429 | #define VM_FLAGS_CLEAR (ARCH_VM_PKEY_FLAGS | VM_ARCH_CLEAR) | |
430 | ||
1da177e4 LT |
431 | /* |
432 | * mapping from the currently active vm_flags protection bits (the | |
433 | * low four bits) to a page protection mask.. | |
434 | */ | |
435 | extern pgprot_t protection_map[16]; | |
436 | ||
c270a7ee | 437 | /** |
da2f5eb3 | 438 | * enum fault_flag - Fault flag definitions. |
c270a7ee PX |
439 | * @FAULT_FLAG_WRITE: Fault was a write fault. |
440 | * @FAULT_FLAG_MKWRITE: Fault was mkwrite of existing PTE. | |
441 | * @FAULT_FLAG_ALLOW_RETRY: Allow to retry the fault if blocked. | |
c1e8d7c6 | 442 | * @FAULT_FLAG_RETRY_NOWAIT: Don't drop mmap_lock and wait when retrying. |
c270a7ee PX |
443 | * @FAULT_FLAG_KILLABLE: The fault task is in SIGKILL killable region. |
444 | * @FAULT_FLAG_TRIED: The fault has been tried once. | |
445 | * @FAULT_FLAG_USER: The fault originated in userspace. | |
446 | * @FAULT_FLAG_REMOTE: The fault is not for current task/mm. | |
447 | * @FAULT_FLAG_INSTRUCTION: The fault was during an instruction fetch. | |
448 | * @FAULT_FLAG_INTERRUPTIBLE: The fault can be interrupted by non-fatal signals. | |
4064b982 PX |
449 | * |
450 | * About @FAULT_FLAG_ALLOW_RETRY and @FAULT_FLAG_TRIED: we can specify | |
451 | * whether we would allow page faults to retry by specifying these two | |
452 | * fault flags correctly. Currently there can be three legal combinations: | |
453 | * | |
454 | * (a) ALLOW_RETRY and !TRIED: this means the page fault allows retry, and | |
455 | * this is the first try | |
456 | * | |
457 | * (b) ALLOW_RETRY and TRIED: this means the page fault allows retry, and | |
458 | * we've already tried at least once | |
459 | * | |
460 | * (c) !ALLOW_RETRY and !TRIED: this means the page fault does not allow retry | |
461 | * | |
462 | * The unlisted combination (!ALLOW_RETRY && TRIED) is illegal and should never | |
463 | * be used. Note that page faults can be allowed to retry for multiple times, | |
464 | * in which case we'll have an initial fault with flags (a) then later on | |
465 | * continuous faults with flags (b). We should always try to detect pending | |
466 | * signals before a retry to make sure the continuous page faults can still be | |
467 | * interrupted if necessary. | |
c270a7ee | 468 | */ |
da2f5eb3 MWO |
469 | enum fault_flag { |
470 | FAULT_FLAG_WRITE = 1 << 0, | |
471 | FAULT_FLAG_MKWRITE = 1 << 1, | |
472 | FAULT_FLAG_ALLOW_RETRY = 1 << 2, | |
473 | FAULT_FLAG_RETRY_NOWAIT = 1 << 3, | |
474 | FAULT_FLAG_KILLABLE = 1 << 4, | |
475 | FAULT_FLAG_TRIED = 1 << 5, | |
476 | FAULT_FLAG_USER = 1 << 6, | |
477 | FAULT_FLAG_REMOTE = 1 << 7, | |
478 | FAULT_FLAG_INSTRUCTION = 1 << 8, | |
479 | FAULT_FLAG_INTERRUPTIBLE = 1 << 9, | |
480 | }; | |
d0217ac0 | 481 | |
dde16072 PX |
482 | /* |
483 | * The default fault flags that should be used by most of the | |
484 | * arch-specific page fault handlers. | |
485 | */ | |
486 | #define FAULT_FLAG_DEFAULT (FAULT_FLAG_ALLOW_RETRY | \ | |
c270a7ee PX |
487 | FAULT_FLAG_KILLABLE | \ |
488 | FAULT_FLAG_INTERRUPTIBLE) | |
dde16072 | 489 | |
4064b982 PX |
490 | /** |
491 | * fault_flag_allow_retry_first - check ALLOW_RETRY the first time | |
78f4841e | 492 | * @flags: Fault flags. |
4064b982 PX |
493 | * |
494 | * This is mostly used for places where we want to try to avoid taking | |
c1e8d7c6 | 495 | * the mmap_lock for too long a time when waiting for another condition |
4064b982 | 496 | * to change, in which case we can try to be polite to release the |
c1e8d7c6 ML |
497 | * mmap_lock in the first round to avoid potential starvation of other |
498 | * processes that would also want the mmap_lock. | |
4064b982 PX |
499 | * |
500 | * Return: true if the page fault allows retry and this is the first | |
501 | * attempt of the fault handling; false otherwise. | |
502 | */ | |
da2f5eb3 | 503 | static inline bool fault_flag_allow_retry_first(enum fault_flag flags) |
4064b982 PX |
504 | { |
505 | return (flags & FAULT_FLAG_ALLOW_RETRY) && | |
506 | (!(flags & FAULT_FLAG_TRIED)); | |
507 | } | |
508 | ||
282a8e03 RZ |
509 | #define FAULT_FLAG_TRACE \ |
510 | { FAULT_FLAG_WRITE, "WRITE" }, \ | |
511 | { FAULT_FLAG_MKWRITE, "MKWRITE" }, \ | |
512 | { FAULT_FLAG_ALLOW_RETRY, "ALLOW_RETRY" }, \ | |
513 | { FAULT_FLAG_RETRY_NOWAIT, "RETRY_NOWAIT" }, \ | |
514 | { FAULT_FLAG_KILLABLE, "KILLABLE" }, \ | |
515 | { FAULT_FLAG_TRIED, "TRIED" }, \ | |
516 | { FAULT_FLAG_USER, "USER" }, \ | |
517 | { FAULT_FLAG_REMOTE, "REMOTE" }, \ | |
c270a7ee PX |
518 | { FAULT_FLAG_INSTRUCTION, "INSTRUCTION" }, \ |
519 | { FAULT_FLAG_INTERRUPTIBLE, "INTERRUPTIBLE" } | |
282a8e03 | 520 | |
54cb8821 | 521 | /* |
11192337 | 522 | * vm_fault is filled by the pagefault handler and passed to the vma's |
83c54070 NP |
523 | * ->fault function. The vma's ->fault is responsible for returning a bitmask |
524 | * of VM_FAULT_xxx flags that give details about how the fault was handled. | |
54cb8821 | 525 | * |
c20cd45e MH |
526 | * MM layer fills up gfp_mask for page allocations but fault handler might |
527 | * alter it if its implementation requires a different allocation context. | |
528 | * | |
9b4bdd2f | 529 | * pgoff should be used in favour of virtual_address, if possible. |
54cb8821 | 530 | */ |
d0217ac0 | 531 | struct vm_fault { |
5857c920 | 532 | const struct { |
742d3372 WD |
533 | struct vm_area_struct *vma; /* Target VMA */ |
534 | gfp_t gfp_mask; /* gfp mask to be used for allocations */ | |
535 | pgoff_t pgoff; /* Logical page offset based on vma */ | |
536 | unsigned long address; /* Faulting virtual address */ | |
537 | }; | |
da2f5eb3 | 538 | enum fault_flag flags; /* FAULT_FLAG_xxx flags |
742d3372 | 539 | * XXX: should really be 'const' */ |
82b0f8c3 | 540 | pmd_t *pmd; /* Pointer to pmd entry matching |
2994302b | 541 | * the 'address' */ |
a2d58167 DJ |
542 | pud_t *pud; /* Pointer to pud entry matching |
543 | * the 'address' | |
544 | */ | |
5db4f15c YS |
545 | union { |
546 | pte_t orig_pte; /* Value of PTE at the time of fault */ | |
547 | pmd_t orig_pmd; /* Value of PMD at the time of fault, | |
548 | * used by PMD fault only. | |
549 | */ | |
550 | }; | |
d0217ac0 | 551 | |
3917048d | 552 | struct page *cow_page; /* Page handler may use for COW fault */ |
d0217ac0 | 553 | struct page *page; /* ->fault handlers should return a |
83c54070 | 554 | * page here, unless VM_FAULT_NOPAGE |
d0217ac0 | 555 | * is set (which is also implied by |
83c54070 | 556 | * VM_FAULT_ERROR). |
d0217ac0 | 557 | */ |
82b0f8c3 | 558 | /* These three entries are valid only while holding ptl lock */ |
bae473a4 KS |
559 | pte_t *pte; /* Pointer to pte entry matching |
560 | * the 'address'. NULL if the page | |
561 | * table hasn't been allocated. | |
562 | */ | |
563 | spinlock_t *ptl; /* Page table lock. | |
564 | * Protects pte page table if 'pte' | |
565 | * is not NULL, otherwise pmd. | |
566 | */ | |
7267ec00 | 567 | pgtable_t prealloc_pte; /* Pre-allocated pte page table. |
f9ce0be7 KS |
568 | * vm_ops->map_pages() sets up a page |
569 | * table from atomic context. | |
7267ec00 KS |
570 | * do_fault_around() pre-allocates |
571 | * page table to avoid allocation from | |
572 | * atomic context. | |
573 | */ | |
54cb8821 | 574 | }; |
1da177e4 | 575 | |
c791ace1 DJ |
576 | /* page entry size for vm->huge_fault() */ |
577 | enum page_entry_size { | |
578 | PE_SIZE_PTE = 0, | |
579 | PE_SIZE_PMD, | |
580 | PE_SIZE_PUD, | |
581 | }; | |
582 | ||
1da177e4 LT |
583 | /* |
584 | * These are the virtual MM functions - opening of an area, closing and | |
585 | * unmapping it (needed to keep files on disk up-to-date etc), pointer | |
27d036e3 | 586 | * to the functions called when a no-page or a wp-page exception occurs. |
1da177e4 LT |
587 | */ |
588 | struct vm_operations_struct { | |
589 | void (*open)(struct vm_area_struct * area); | |
590 | void (*close)(struct vm_area_struct * area); | |
dd3b614f DS |
591 | /* Called any time before splitting to check if it's allowed */ |
592 | int (*may_split)(struct vm_area_struct *area, unsigned long addr); | |
14d07113 | 593 | int (*mremap)(struct vm_area_struct *area); |
95bb7c42 SC |
594 | /* |
595 | * Called by mprotect() to make driver-specific permission | |
596 | * checks before mprotect() is finalised. The VMA must not | |
597 | * be modified. Returns 0 if eprotect() can proceed. | |
598 | */ | |
599 | int (*mprotect)(struct vm_area_struct *vma, unsigned long start, | |
600 | unsigned long end, unsigned long newflags); | |
1c8f4220 SJ |
601 | vm_fault_t (*fault)(struct vm_fault *vmf); |
602 | vm_fault_t (*huge_fault)(struct vm_fault *vmf, | |
603 | enum page_entry_size pe_size); | |
f9ce0be7 | 604 | vm_fault_t (*map_pages)(struct vm_fault *vmf, |
bae473a4 | 605 | pgoff_t start_pgoff, pgoff_t end_pgoff); |
05ea8860 | 606 | unsigned long (*pagesize)(struct vm_area_struct * area); |
9637a5ef DH |
607 | |
608 | /* notification that a previously read-only page is about to become | |
609 | * writable, if an error is returned it will cause a SIGBUS */ | |
1c8f4220 | 610 | vm_fault_t (*page_mkwrite)(struct vm_fault *vmf); |
28b2ee20 | 611 | |
dd906184 | 612 | /* same as page_mkwrite when using VM_PFNMAP|VM_MIXEDMAP */ |
1c8f4220 | 613 | vm_fault_t (*pfn_mkwrite)(struct vm_fault *vmf); |
dd906184 | 614 | |
28b2ee20 | 615 | /* called by access_process_vm when get_user_pages() fails, typically |
96667f8a DV |
616 | * for use by special VMAs. See also generic_access_phys() for a generic |
617 | * implementation useful for any iomem mapping. | |
28b2ee20 RR |
618 | */ |
619 | int (*access)(struct vm_area_struct *vma, unsigned long addr, | |
620 | void *buf, int len, int write); | |
78d683e8 AL |
621 | |
622 | /* Called by the /proc/PID/maps code to ask the vma whether it | |
623 | * has a special name. Returning non-NULL will also cause this | |
624 | * vma to be dumped unconditionally. */ | |
625 | const char *(*name)(struct vm_area_struct *vma); | |
626 | ||
1da177e4 | 627 | #ifdef CONFIG_NUMA |
a6020ed7 LS |
628 | /* |
629 | * set_policy() op must add a reference to any non-NULL @new mempolicy | |
630 | * to hold the policy upon return. Caller should pass NULL @new to | |
631 | * remove a policy and fall back to surrounding context--i.e. do not | |
632 | * install a MPOL_DEFAULT policy, nor the task or system default | |
633 | * mempolicy. | |
634 | */ | |
1da177e4 | 635 | int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new); |
a6020ed7 LS |
636 | |
637 | /* | |
638 | * get_policy() op must add reference [mpol_get()] to any policy at | |
639 | * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure | |
640 | * in mm/mempolicy.c will do this automatically. | |
641 | * get_policy() must NOT add a ref if the policy at (vma,addr) is not | |
c1e8d7c6 | 642 | * marked as MPOL_SHARED. vma policies are protected by the mmap_lock. |
a6020ed7 LS |
643 | * If no [shared/vma] mempolicy exists at the addr, get_policy() op |
644 | * must return NULL--i.e., do not "fallback" to task or system default | |
645 | * policy. | |
646 | */ | |
1da177e4 LT |
647 | struct mempolicy *(*get_policy)(struct vm_area_struct *vma, |
648 | unsigned long addr); | |
649 | #endif | |
667a0a06 DV |
650 | /* |
651 | * Called by vm_normal_page() for special PTEs to find the | |
652 | * page for @addr. This is useful if the default behavior | |
653 | * (using pte_page()) would not find the correct page. | |
654 | */ | |
655 | struct page *(*find_special_page)(struct vm_area_struct *vma, | |
656 | unsigned long addr); | |
1da177e4 LT |
657 | }; |
658 | ||
027232da KS |
659 | static inline void vma_init(struct vm_area_struct *vma, struct mm_struct *mm) |
660 | { | |
bfd40eaf KS |
661 | static const struct vm_operations_struct dummy_vm_ops = {}; |
662 | ||
a670468f | 663 | memset(vma, 0, sizeof(*vma)); |
027232da | 664 | vma->vm_mm = mm; |
bfd40eaf | 665 | vma->vm_ops = &dummy_vm_ops; |
027232da KS |
666 | INIT_LIST_HEAD(&vma->anon_vma_chain); |
667 | } | |
668 | ||
bfd40eaf KS |
669 | static inline void vma_set_anonymous(struct vm_area_struct *vma) |
670 | { | |
671 | vma->vm_ops = NULL; | |
672 | } | |
673 | ||
43675e6f YS |
674 | static inline bool vma_is_anonymous(struct vm_area_struct *vma) |
675 | { | |
676 | return !vma->vm_ops; | |
677 | } | |
678 | ||
222100ee AK |
679 | static inline bool vma_is_temporary_stack(struct vm_area_struct *vma) |
680 | { | |
681 | int maybe_stack = vma->vm_flags & (VM_GROWSDOWN | VM_GROWSUP); | |
682 | ||
683 | if (!maybe_stack) | |
684 | return false; | |
685 | ||
686 | if ((vma->vm_flags & VM_STACK_INCOMPLETE_SETUP) == | |
687 | VM_STACK_INCOMPLETE_SETUP) | |
688 | return true; | |
689 | ||
690 | return false; | |
691 | } | |
692 | ||
7969f226 AK |
693 | static inline bool vma_is_foreign(struct vm_area_struct *vma) |
694 | { | |
695 | if (!current->mm) | |
696 | return true; | |
697 | ||
698 | if (current->mm != vma->vm_mm) | |
699 | return true; | |
700 | ||
701 | return false; | |
702 | } | |
3122e80e AK |
703 | |
704 | static inline bool vma_is_accessible(struct vm_area_struct *vma) | |
705 | { | |
6cb4d9a2 | 706 | return vma->vm_flags & VM_ACCESS_FLAGS; |
3122e80e AK |
707 | } |
708 | ||
43675e6f YS |
709 | #ifdef CONFIG_SHMEM |
710 | /* | |
711 | * The vma_is_shmem is not inline because it is used only by slow | |
712 | * paths in userfault. | |
713 | */ | |
714 | bool vma_is_shmem(struct vm_area_struct *vma); | |
715 | #else | |
716 | static inline bool vma_is_shmem(struct vm_area_struct *vma) { return false; } | |
717 | #endif | |
718 | ||
719 | int vma_is_stack_for_current(struct vm_area_struct *vma); | |
720 | ||
8b11ec1b LT |
721 | /* flush_tlb_range() takes a vma, not a mm, and can care about flags */ |
722 | #define TLB_FLUSH_VMA(mm,flags) { .vm_mm = (mm), .vm_flags = (flags) } | |
723 | ||
1da177e4 LT |
724 | struct mmu_gather; |
725 | struct inode; | |
726 | ||
71e3aac0 | 727 | #include <linux/huge_mm.h> |
1da177e4 LT |
728 | |
729 | /* | |
730 | * Methods to modify the page usage count. | |
731 | * | |
732 | * What counts for a page usage: | |
733 | * - cache mapping (page->mapping) | |
734 | * - private data (page->private) | |
735 | * - page mapped in a task's page tables, each mapping | |
736 | * is counted separately | |
737 | * | |
738 | * Also, many kernel routines increase the page count before a critical | |
739 | * routine so they can be sure the page doesn't go away from under them. | |
1da177e4 LT |
740 | */ |
741 | ||
742 | /* | |
da6052f7 | 743 | * Drop a ref, return true if the refcount fell to zero (the page has no users) |
1da177e4 | 744 | */ |
7c8ee9a8 NP |
745 | static inline int put_page_testzero(struct page *page) |
746 | { | |
fe896d18 JK |
747 | VM_BUG_ON_PAGE(page_ref_count(page) == 0, page); |
748 | return page_ref_dec_and_test(page); | |
7c8ee9a8 | 749 | } |
1da177e4 LT |
750 | |
751 | /* | |
7c8ee9a8 NP |
752 | * Try to grab a ref unless the page has a refcount of zero, return false if |
753 | * that is the case. | |
8e0861fa AK |
754 | * This can be called when MMU is off so it must not access |
755 | * any of the virtual mappings. | |
1da177e4 | 756 | */ |
7c8ee9a8 NP |
757 | static inline int get_page_unless_zero(struct page *page) |
758 | { | |
fe896d18 | 759 | return page_ref_add_unless(page, 1, 0); |
7c8ee9a8 | 760 | } |
1da177e4 | 761 | |
53df8fdc | 762 | extern int page_is_ram(unsigned long pfn); |
124fe20d DW |
763 | |
764 | enum { | |
765 | REGION_INTERSECTS, | |
766 | REGION_DISJOINT, | |
767 | REGION_MIXED, | |
768 | }; | |
769 | ||
1c29f25b TK |
770 | int region_intersects(resource_size_t offset, size_t size, unsigned long flags, |
771 | unsigned long desc); | |
53df8fdc | 772 | |
48667e7a | 773 | /* Support for virtually mapped pages */ |
b3bdda02 CL |
774 | struct page *vmalloc_to_page(const void *addr); |
775 | unsigned long vmalloc_to_pfn(const void *addr); | |
48667e7a | 776 | |
0738c4bb PM |
777 | /* |
778 | * Determine if an address is within the vmalloc range | |
779 | * | |
780 | * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there | |
781 | * is no special casing required. | |
782 | */ | |
9bd3bb67 AK |
783 | |
784 | #ifndef is_ioremap_addr | |
785 | #define is_ioremap_addr(x) is_vmalloc_addr(x) | |
786 | #endif | |
787 | ||
81ac3ad9 | 788 | #ifdef CONFIG_MMU |
186525bd | 789 | extern bool is_vmalloc_addr(const void *x); |
81ac3ad9 KH |
790 | extern int is_vmalloc_or_module_addr(const void *x); |
791 | #else | |
186525bd IM |
792 | static inline bool is_vmalloc_addr(const void *x) |
793 | { | |
794 | return false; | |
795 | } | |
934831d0 | 796 | static inline int is_vmalloc_or_module_addr(const void *x) |
81ac3ad9 KH |
797 | { |
798 | return 0; | |
799 | } | |
800 | #endif | |
9e2779fa | 801 | |
bac3cf4d | 802 | static inline int head_compound_mapcount(struct page *head) |
6dc5ea16 JH |
803 | { |
804 | return atomic_read(compound_mapcount_ptr(head)) + 1; | |
805 | } | |
806 | ||
6988f31d KK |
807 | /* |
808 | * Mapcount of compound page as a whole, does not include mapped sub-pages. | |
809 | * | |
810 | * Must be called only for compound pages or any their tail sub-pages. | |
811 | */ | |
53f9263b KS |
812 | static inline int compound_mapcount(struct page *page) |
813 | { | |
5f527c2b | 814 | VM_BUG_ON_PAGE(!PageCompound(page), page); |
53f9263b | 815 | page = compound_head(page); |
bac3cf4d | 816 | return head_compound_mapcount(page); |
53f9263b KS |
817 | } |
818 | ||
70b50f94 AA |
819 | /* |
820 | * The atomic page->_mapcount, starts from -1: so that transitions | |
821 | * both from it and to it can be tracked, using atomic_inc_and_test | |
822 | * and atomic_add_negative(-1). | |
823 | */ | |
22b751c3 | 824 | static inline void page_mapcount_reset(struct page *page) |
70b50f94 AA |
825 | { |
826 | atomic_set(&(page)->_mapcount, -1); | |
827 | } | |
828 | ||
b20ce5e0 KS |
829 | int __page_mapcount(struct page *page); |
830 | ||
6988f31d KK |
831 | /* |
832 | * Mapcount of 0-order page; when compound sub-page, includes | |
833 | * compound_mapcount(). | |
834 | * | |
835 | * Result is undefined for pages which cannot be mapped into userspace. | |
836 | * For example SLAB or special types of pages. See function page_has_type(). | |
837 | * They use this place in struct page differently. | |
838 | */ | |
70b50f94 AA |
839 | static inline int page_mapcount(struct page *page) |
840 | { | |
b20ce5e0 KS |
841 | if (unlikely(PageCompound(page))) |
842 | return __page_mapcount(page); | |
843 | return atomic_read(&page->_mapcount) + 1; | |
844 | } | |
845 | ||
846 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
847 | int total_mapcount(struct page *page); | |
6d0a07ed | 848 | int page_trans_huge_mapcount(struct page *page, int *total_mapcount); |
b20ce5e0 KS |
849 | #else |
850 | static inline int total_mapcount(struct page *page) | |
851 | { | |
852 | return page_mapcount(page); | |
70b50f94 | 853 | } |
6d0a07ed AA |
854 | static inline int page_trans_huge_mapcount(struct page *page, |
855 | int *total_mapcount) | |
856 | { | |
857 | int mapcount = page_mapcount(page); | |
858 | if (total_mapcount) | |
859 | *total_mapcount = mapcount; | |
860 | return mapcount; | |
861 | } | |
b20ce5e0 | 862 | #endif |
70b50f94 | 863 | |
b49af68f CL |
864 | static inline struct page *virt_to_head_page(const void *x) |
865 | { | |
866 | struct page *page = virt_to_page(x); | |
ccaafd7f | 867 | |
1d798ca3 | 868 | return compound_head(page); |
b49af68f CL |
869 | } |
870 | ||
ddc58f27 KS |
871 | void __put_page(struct page *page); |
872 | ||
1d7ea732 | 873 | void put_pages_list(struct list_head *pages); |
1da177e4 | 874 | |
8dfcc9ba | 875 | void split_page(struct page *page, unsigned int order); |
79789db0 | 876 | void copy_huge_page(struct page *dst, struct page *src); |
8dfcc9ba | 877 | |
33f2ef89 AW |
878 | /* |
879 | * Compound pages have a destructor function. Provide a | |
880 | * prototype for that function and accessor functions. | |
f1e61557 | 881 | * These are _only_ valid on the head of a compound page. |
33f2ef89 | 882 | */ |
f1e61557 KS |
883 | typedef void compound_page_dtor(struct page *); |
884 | ||
885 | /* Keep the enum in sync with compound_page_dtors array in mm/page_alloc.c */ | |
886 | enum compound_dtor_id { | |
887 | NULL_COMPOUND_DTOR, | |
888 | COMPOUND_PAGE_DTOR, | |
889 | #ifdef CONFIG_HUGETLB_PAGE | |
890 | HUGETLB_PAGE_DTOR, | |
9a982250 KS |
891 | #endif |
892 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
893 | TRANSHUGE_PAGE_DTOR, | |
f1e61557 KS |
894 | #endif |
895 | NR_COMPOUND_DTORS, | |
896 | }; | |
ae70eddd | 897 | extern compound_page_dtor * const compound_page_dtors[NR_COMPOUND_DTORS]; |
33f2ef89 AW |
898 | |
899 | static inline void set_compound_page_dtor(struct page *page, | |
f1e61557 | 900 | enum compound_dtor_id compound_dtor) |
33f2ef89 | 901 | { |
f1e61557 KS |
902 | VM_BUG_ON_PAGE(compound_dtor >= NR_COMPOUND_DTORS, page); |
903 | page[1].compound_dtor = compound_dtor; | |
33f2ef89 AW |
904 | } |
905 | ||
ff45fc3c | 906 | static inline void destroy_compound_page(struct page *page) |
33f2ef89 | 907 | { |
f1e61557 | 908 | VM_BUG_ON_PAGE(page[1].compound_dtor >= NR_COMPOUND_DTORS, page); |
ff45fc3c | 909 | compound_page_dtors[page[1].compound_dtor](page); |
33f2ef89 AW |
910 | } |
911 | ||
d00181b9 | 912 | static inline unsigned int compound_order(struct page *page) |
d85f3385 | 913 | { |
6d777953 | 914 | if (!PageHead(page)) |
d85f3385 | 915 | return 0; |
e4b294c2 | 916 | return page[1].compound_order; |
d85f3385 CL |
917 | } |
918 | ||
47e29d32 JH |
919 | static inline bool hpage_pincount_available(struct page *page) |
920 | { | |
921 | /* | |
922 | * Can the page->hpage_pinned_refcount field be used? That field is in | |
923 | * the 3rd page of the compound page, so the smallest (2-page) compound | |
924 | * pages cannot support it. | |
925 | */ | |
926 | page = compound_head(page); | |
927 | return PageCompound(page) && compound_order(page) > 1; | |
928 | } | |
929 | ||
bac3cf4d | 930 | static inline int head_compound_pincount(struct page *head) |
6dc5ea16 JH |
931 | { |
932 | return atomic_read(compound_pincount_ptr(head)); | |
933 | } | |
934 | ||
47e29d32 JH |
935 | static inline int compound_pincount(struct page *page) |
936 | { | |
937 | VM_BUG_ON_PAGE(!hpage_pincount_available(page), page); | |
938 | page = compound_head(page); | |
bac3cf4d | 939 | return head_compound_pincount(page); |
47e29d32 JH |
940 | } |
941 | ||
f1e61557 | 942 | static inline void set_compound_order(struct page *page, unsigned int order) |
d85f3385 | 943 | { |
e4b294c2 | 944 | page[1].compound_order = order; |
1378a5ee | 945 | page[1].compound_nr = 1U << order; |
d85f3385 CL |
946 | } |
947 | ||
d8c6546b MWO |
948 | /* Returns the number of pages in this potentially compound page. */ |
949 | static inline unsigned long compound_nr(struct page *page) | |
950 | { | |
1378a5ee MWO |
951 | if (!PageHead(page)) |
952 | return 1; | |
953 | return page[1].compound_nr; | |
d8c6546b MWO |
954 | } |
955 | ||
a50b854e MWO |
956 | /* Returns the number of bytes in this potentially compound page. */ |
957 | static inline unsigned long page_size(struct page *page) | |
958 | { | |
959 | return PAGE_SIZE << compound_order(page); | |
960 | } | |
961 | ||
94ad9338 MWO |
962 | /* Returns the number of bits needed for the number of bytes in a page */ |
963 | static inline unsigned int page_shift(struct page *page) | |
964 | { | |
965 | return PAGE_SHIFT + compound_order(page); | |
966 | } | |
967 | ||
9a982250 KS |
968 | void free_compound_page(struct page *page); |
969 | ||
3dece370 | 970 | #ifdef CONFIG_MMU |
14fd403f AA |
971 | /* |
972 | * Do pte_mkwrite, but only if the vma says VM_WRITE. We do this when | |
973 | * servicing faults for write access. In the normal case, do always want | |
974 | * pte_mkwrite. But get_user_pages can cause write faults for mappings | |
975 | * that do not have writing enabled, when used by access_process_vm. | |
976 | */ | |
977 | static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma) | |
978 | { | |
979 | if (likely(vma->vm_flags & VM_WRITE)) | |
980 | pte = pte_mkwrite(pte); | |
981 | return pte; | |
982 | } | |
8c6e50b0 | 983 | |
f9ce0be7 | 984 | vm_fault_t do_set_pmd(struct vm_fault *vmf, struct page *page); |
9d3af4b4 | 985 | void do_set_pte(struct vm_fault *vmf, struct page *page, unsigned long addr); |
f9ce0be7 | 986 | |
2b740303 SJ |
987 | vm_fault_t finish_fault(struct vm_fault *vmf); |
988 | vm_fault_t finish_mkwrite_fault(struct vm_fault *vmf); | |
3dece370 | 989 | #endif |
14fd403f | 990 | |
1da177e4 LT |
991 | /* |
992 | * Multiple processes may "see" the same page. E.g. for untouched | |
993 | * mappings of /dev/null, all processes see the same page full of | |
994 | * zeroes, and text pages of executables and shared libraries have | |
995 | * only one copy in memory, at most, normally. | |
996 | * | |
997 | * For the non-reserved pages, page_count(page) denotes a reference count. | |
7e871b6c PBG |
998 | * page_count() == 0 means the page is free. page->lru is then used for |
999 | * freelist management in the buddy allocator. | |
da6052f7 | 1000 | * page_count() > 0 means the page has been allocated. |
1da177e4 | 1001 | * |
da6052f7 NP |
1002 | * Pages are allocated by the slab allocator in order to provide memory |
1003 | * to kmalloc and kmem_cache_alloc. In this case, the management of the | |
1004 | * page, and the fields in 'struct page' are the responsibility of mm/slab.c | |
1005 | * unless a particular usage is carefully commented. (the responsibility of | |
1006 | * freeing the kmalloc memory is the caller's, of course). | |
1da177e4 | 1007 | * |
da6052f7 NP |
1008 | * A page may be used by anyone else who does a __get_free_page(). |
1009 | * In this case, page_count still tracks the references, and should only | |
1010 | * be used through the normal accessor functions. The top bits of page->flags | |
1011 | * and page->virtual store page management information, but all other fields | |
1012 | * are unused and could be used privately, carefully. The management of this | |
1013 | * page is the responsibility of the one who allocated it, and those who have | |
1014 | * subsequently been given references to it. | |
1015 | * | |
1016 | * The other pages (we may call them "pagecache pages") are completely | |
1da177e4 LT |
1017 | * managed by the Linux memory manager: I/O, buffers, swapping etc. |
1018 | * The following discussion applies only to them. | |
1019 | * | |
da6052f7 NP |
1020 | * A pagecache page contains an opaque `private' member, which belongs to the |
1021 | * page's address_space. Usually, this is the address of a circular list of | |
1022 | * the page's disk buffers. PG_private must be set to tell the VM to call | |
1023 | * into the filesystem to release these pages. | |
1da177e4 | 1024 | * |
da6052f7 NP |
1025 | * A page may belong to an inode's memory mapping. In this case, page->mapping |
1026 | * is the pointer to the inode, and page->index is the file offset of the page, | |
ea1754a0 | 1027 | * in units of PAGE_SIZE. |
1da177e4 | 1028 | * |
da6052f7 NP |
1029 | * If pagecache pages are not associated with an inode, they are said to be |
1030 | * anonymous pages. These may become associated with the swapcache, and in that | |
1031 | * case PG_swapcache is set, and page->private is an offset into the swapcache. | |
1da177e4 | 1032 | * |
da6052f7 NP |
1033 | * In either case (swapcache or inode backed), the pagecache itself holds one |
1034 | * reference to the page. Setting PG_private should also increment the | |
1035 | * refcount. The each user mapping also has a reference to the page. | |
1da177e4 | 1036 | * |
da6052f7 | 1037 | * The pagecache pages are stored in a per-mapping radix tree, which is |
b93b0163 | 1038 | * rooted at mapping->i_pages, and indexed by offset. |
da6052f7 NP |
1039 | * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space |
1040 | * lists, we instead now tag pages as dirty/writeback in the radix tree. | |
1da177e4 | 1041 | * |
da6052f7 | 1042 | * All pagecache pages may be subject to I/O: |
1da177e4 LT |
1043 | * - inode pages may need to be read from disk, |
1044 | * - inode pages which have been modified and are MAP_SHARED may need | |
da6052f7 NP |
1045 | * to be written back to the inode on disk, |
1046 | * - anonymous pages (including MAP_PRIVATE file mappings) which have been | |
1047 | * modified may need to be swapped out to swap space and (later) to be read | |
1048 | * back into memory. | |
1da177e4 LT |
1049 | */ |
1050 | ||
1051 | /* | |
1052 | * The zone field is never updated after free_area_init_core() | |
1053 | * sets it, so none of the operations on it need to be atomic. | |
1da177e4 | 1054 | */ |
348f8b6c | 1055 | |
90572890 | 1056 | /* Page flags: | [SECTION] | [NODE] | ZONE | [LAST_CPUPID] | ... | FLAGS | */ |
07808b74 | 1057 | #define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH) |
d41dee36 AW |
1058 | #define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH) |
1059 | #define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH) | |
90572890 | 1060 | #define LAST_CPUPID_PGOFF (ZONES_PGOFF - LAST_CPUPID_WIDTH) |
2813b9c0 | 1061 | #define KASAN_TAG_PGOFF (LAST_CPUPID_PGOFF - KASAN_TAG_WIDTH) |
d41dee36 | 1062 | |
348f8b6c | 1063 | /* |
25985edc | 1064 | * Define the bit shifts to access each section. For non-existent |
348f8b6c DH |
1065 | * sections we define the shift as 0; that plus a 0 mask ensures |
1066 | * the compiler will optimise away reference to them. | |
1067 | */ | |
d41dee36 AW |
1068 | #define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0)) |
1069 | #define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0)) | |
1070 | #define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0)) | |
90572890 | 1071 | #define LAST_CPUPID_PGSHIFT (LAST_CPUPID_PGOFF * (LAST_CPUPID_WIDTH != 0)) |
2813b9c0 | 1072 | #define KASAN_TAG_PGSHIFT (KASAN_TAG_PGOFF * (KASAN_TAG_WIDTH != 0)) |
348f8b6c | 1073 | |
bce54bbf WD |
1074 | /* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allocator */ |
1075 | #ifdef NODE_NOT_IN_PAGE_FLAGS | |
89689ae7 | 1076 | #define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT) |
bd8029b6 AW |
1077 | #define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF)? \ |
1078 | SECTIONS_PGOFF : ZONES_PGOFF) | |
d41dee36 | 1079 | #else |
89689ae7 | 1080 | #define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT) |
bd8029b6 AW |
1081 | #define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF)? \ |
1082 | NODES_PGOFF : ZONES_PGOFF) | |
89689ae7 CL |
1083 | #endif |
1084 | ||
bd8029b6 | 1085 | #define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0)) |
348f8b6c | 1086 | |
d41dee36 AW |
1087 | #define ZONES_MASK ((1UL << ZONES_WIDTH) - 1) |
1088 | #define NODES_MASK ((1UL << NODES_WIDTH) - 1) | |
1089 | #define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1) | |
834a964a | 1090 | #define LAST_CPUPID_MASK ((1UL << LAST_CPUPID_SHIFT) - 1) |
2813b9c0 | 1091 | #define KASAN_TAG_MASK ((1UL << KASAN_TAG_WIDTH) - 1) |
89689ae7 | 1092 | #define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1) |
348f8b6c | 1093 | |
33dd4e0e | 1094 | static inline enum zone_type page_zonenum(const struct page *page) |
1da177e4 | 1095 | { |
c403f6a3 | 1096 | ASSERT_EXCLUSIVE_BITS(page->flags, ZONES_MASK << ZONES_PGSHIFT); |
348f8b6c | 1097 | return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK; |
1da177e4 | 1098 | } |
1da177e4 | 1099 | |
260ae3f7 DW |
1100 | #ifdef CONFIG_ZONE_DEVICE |
1101 | static inline bool is_zone_device_page(const struct page *page) | |
1102 | { | |
1103 | return page_zonenum(page) == ZONE_DEVICE; | |
1104 | } | |
966cf44f AD |
1105 | extern void memmap_init_zone_device(struct zone *, unsigned long, |
1106 | unsigned long, struct dev_pagemap *); | |
260ae3f7 DW |
1107 | #else |
1108 | static inline bool is_zone_device_page(const struct page *page) | |
1109 | { | |
1110 | return false; | |
1111 | } | |
7b2d55d2 | 1112 | #endif |
5042db43 | 1113 | |
8e3560d9 PT |
1114 | static inline bool is_zone_movable_page(const struct page *page) |
1115 | { | |
1116 | return page_zonenum(page) == ZONE_MOVABLE; | |
1117 | } | |
1118 | ||
e7638488 | 1119 | #ifdef CONFIG_DEV_PAGEMAP_OPS |
07d80269 | 1120 | void free_devmap_managed_page(struct page *page); |
e7638488 | 1121 | DECLARE_STATIC_KEY_FALSE(devmap_managed_key); |
07d80269 JH |
1122 | |
1123 | static inline bool page_is_devmap_managed(struct page *page) | |
e7638488 DW |
1124 | { |
1125 | if (!static_branch_unlikely(&devmap_managed_key)) | |
1126 | return false; | |
1127 | if (!is_zone_device_page(page)) | |
1128 | return false; | |
1129 | switch (page->pgmap->type) { | |
1130 | case MEMORY_DEVICE_PRIVATE: | |
e7638488 | 1131 | case MEMORY_DEVICE_FS_DAX: |
e7638488 DW |
1132 | return true; |
1133 | default: | |
1134 | break; | |
1135 | } | |
1136 | return false; | |
1137 | } | |
1138 | ||
07d80269 JH |
1139 | void put_devmap_managed_page(struct page *page); |
1140 | ||
e7638488 | 1141 | #else /* CONFIG_DEV_PAGEMAP_OPS */ |
07d80269 | 1142 | static inline bool page_is_devmap_managed(struct page *page) |
e7638488 DW |
1143 | { |
1144 | return false; | |
1145 | } | |
07d80269 JH |
1146 | |
1147 | static inline void put_devmap_managed_page(struct page *page) | |
1148 | { | |
1149 | } | |
7588adf8 | 1150 | #endif /* CONFIG_DEV_PAGEMAP_OPS */ |
e7638488 | 1151 | |
6b368cd4 JG |
1152 | static inline bool is_device_private_page(const struct page *page) |
1153 | { | |
7588adf8 RM |
1154 | return IS_ENABLED(CONFIG_DEV_PAGEMAP_OPS) && |
1155 | IS_ENABLED(CONFIG_DEVICE_PRIVATE) && | |
1156 | is_zone_device_page(page) && | |
1157 | page->pgmap->type == MEMORY_DEVICE_PRIVATE; | |
6b368cd4 | 1158 | } |
e7638488 | 1159 | |
52916982 LG |
1160 | static inline bool is_pci_p2pdma_page(const struct page *page) |
1161 | { | |
7588adf8 RM |
1162 | return IS_ENABLED(CONFIG_DEV_PAGEMAP_OPS) && |
1163 | IS_ENABLED(CONFIG_PCI_P2PDMA) && | |
1164 | is_zone_device_page(page) && | |
1165 | page->pgmap->type == MEMORY_DEVICE_PCI_P2PDMA; | |
52916982 | 1166 | } |
7b2d55d2 | 1167 | |
f958d7b5 LT |
1168 | /* 127: arbitrary random number, small enough to assemble well */ |
1169 | #define page_ref_zero_or_close_to_overflow(page) \ | |
1170 | ((unsigned int) page_ref_count(page) + 127u <= 127u) | |
1171 | ||
3565fce3 DW |
1172 | static inline void get_page(struct page *page) |
1173 | { | |
1174 | page = compound_head(page); | |
1175 | /* | |
1176 | * Getting a normal page or the head of a compound page | |
0139aa7b | 1177 | * requires to already have an elevated page->_refcount. |
3565fce3 | 1178 | */ |
f958d7b5 | 1179 | VM_BUG_ON_PAGE(page_ref_zero_or_close_to_overflow(page), page); |
fe896d18 | 1180 | page_ref_inc(page); |
3565fce3 DW |
1181 | } |
1182 | ||
3faa52c0 | 1183 | bool __must_check try_grab_page(struct page *page, unsigned int flags); |
54d516b1 JH |
1184 | struct page *try_grab_compound_head(struct page *page, int refs, |
1185 | unsigned int flags); | |
0fa5bc40 | 1186 | |
cd1adf1b LT |
1187 | |
1188 | static inline __must_check bool try_get_page(struct page *page) | |
1189 | { | |
1190 | page = compound_head(page); | |
1191 | if (WARN_ON_ONCE(page_ref_count(page) <= 0)) | |
1192 | return false; | |
1193 | page_ref_inc(page); | |
1194 | return true; | |
1195 | } | |
3565fce3 DW |
1196 | |
1197 | static inline void put_page(struct page *page) | |
1198 | { | |
1199 | page = compound_head(page); | |
1200 | ||
7b2d55d2 | 1201 | /* |
e7638488 DW |
1202 | * For devmap managed pages we need to catch refcount transition from |
1203 | * 2 to 1, when refcount reach one it means the page is free and we | |
1204 | * need to inform the device driver through callback. See | |
7b2d55d2 JG |
1205 | * include/linux/memremap.h and HMM for details. |
1206 | */ | |
07d80269 JH |
1207 | if (page_is_devmap_managed(page)) { |
1208 | put_devmap_managed_page(page); | |
7b2d55d2 | 1209 | return; |
07d80269 | 1210 | } |
7b2d55d2 | 1211 | |
3565fce3 DW |
1212 | if (put_page_testzero(page)) |
1213 | __put_page(page); | |
3565fce3 DW |
1214 | } |
1215 | ||
3faa52c0 JH |
1216 | /* |
1217 | * GUP_PIN_COUNTING_BIAS, and the associated functions that use it, overload | |
1218 | * the page's refcount so that two separate items are tracked: the original page | |
1219 | * reference count, and also a new count of how many pin_user_pages() calls were | |
1220 | * made against the page. ("gup-pinned" is another term for the latter). | |
1221 | * | |
1222 | * With this scheme, pin_user_pages() becomes special: such pages are marked as | |
1223 | * distinct from normal pages. As such, the unpin_user_page() call (and its | |
1224 | * variants) must be used in order to release gup-pinned pages. | |
1225 | * | |
1226 | * Choice of value: | |
1227 | * | |
1228 | * By making GUP_PIN_COUNTING_BIAS a power of two, debugging of page reference | |
1229 | * counts with respect to pin_user_pages() and unpin_user_page() becomes | |
1230 | * simpler, due to the fact that adding an even power of two to the page | |
1231 | * refcount has the effect of using only the upper N bits, for the code that | |
1232 | * counts up using the bias value. This means that the lower bits are left for | |
1233 | * the exclusive use of the original code that increments and decrements by one | |
1234 | * (or at least, by much smaller values than the bias value). | |
fc1d8e7c | 1235 | * |
3faa52c0 JH |
1236 | * Of course, once the lower bits overflow into the upper bits (and this is |
1237 | * OK, because subtraction recovers the original values), then visual inspection | |
1238 | * no longer suffices to directly view the separate counts. However, for normal | |
1239 | * applications that don't have huge page reference counts, this won't be an | |
1240 | * issue. | |
fc1d8e7c | 1241 | * |
3faa52c0 JH |
1242 | * Locking: the lockless algorithm described in page_cache_get_speculative() |
1243 | * and page_cache_gup_pin_speculative() provides safe operation for | |
1244 | * get_user_pages and page_mkclean and other calls that race to set up page | |
1245 | * table entries. | |
fc1d8e7c | 1246 | */ |
3faa52c0 | 1247 | #define GUP_PIN_COUNTING_BIAS (1U << 10) |
fc1d8e7c | 1248 | |
3faa52c0 | 1249 | void unpin_user_page(struct page *page); |
f1f6a7dd JH |
1250 | void unpin_user_pages_dirty_lock(struct page **pages, unsigned long npages, |
1251 | bool make_dirty); | |
458a4f78 JM |
1252 | void unpin_user_page_range_dirty_lock(struct page *page, unsigned long npages, |
1253 | bool make_dirty); | |
f1f6a7dd | 1254 | void unpin_user_pages(struct page **pages, unsigned long npages); |
fc1d8e7c | 1255 | |
3faa52c0 | 1256 | /** |
136dfc99 MWO |
1257 | * page_maybe_dma_pinned - Report if a page is pinned for DMA. |
1258 | * @page: The page. | |
3faa52c0 JH |
1259 | * |
1260 | * This function checks if a page has been pinned via a call to | |
136dfc99 | 1261 | * a function in the pin_user_pages() family. |
3faa52c0 JH |
1262 | * |
1263 | * For non-huge pages, the return value is partially fuzzy: false is not fuzzy, | |
1264 | * because it means "definitely not pinned for DMA", but true means "probably | |
1265 | * pinned for DMA, but possibly a false positive due to having at least | |
1266 | * GUP_PIN_COUNTING_BIAS worth of normal page references". | |
1267 | * | |
1268 | * False positives are OK, because: a) it's unlikely for a page to get that many | |
1269 | * refcounts, and b) all the callers of this routine are expected to be able to | |
1270 | * deal gracefully with a false positive. | |
1271 | * | |
47e29d32 JH |
1272 | * For huge pages, the result will be exactly correct. That's because we have |
1273 | * more tracking data available: the 3rd struct page in the compound page is | |
1274 | * used to track the pincount (instead using of the GUP_PIN_COUNTING_BIAS | |
1275 | * scheme). | |
1276 | * | |
72ef5e52 | 1277 | * For more information, please see Documentation/core-api/pin_user_pages.rst. |
3faa52c0 | 1278 | * |
136dfc99 MWO |
1279 | * Return: True, if it is likely that the page has been "dma-pinned". |
1280 | * False, if the page is definitely not dma-pinned. | |
3faa52c0 JH |
1281 | */ |
1282 | static inline bool page_maybe_dma_pinned(struct page *page) | |
1283 | { | |
47e29d32 JH |
1284 | if (hpage_pincount_available(page)) |
1285 | return compound_pincount(page) > 0; | |
1286 | ||
3faa52c0 JH |
1287 | /* |
1288 | * page_ref_count() is signed. If that refcount overflows, then | |
1289 | * page_ref_count() returns a negative value, and callers will avoid | |
1290 | * further incrementing the refcount. | |
1291 | * | |
1292 | * Here, for that overflow case, use the signed bit to count a little | |
1293 | * bit higher via unsigned math, and thus still get an accurate result. | |
1294 | */ | |
1295 | return ((unsigned int)page_ref_count(compound_head(page))) >= | |
1296 | GUP_PIN_COUNTING_BIAS; | |
1297 | } | |
1298 | ||
97a7e473 PX |
1299 | static inline bool is_cow_mapping(vm_flags_t flags) |
1300 | { | |
1301 | return (flags & (VM_SHARED | VM_MAYWRITE)) == VM_MAYWRITE; | |
1302 | } | |
1303 | ||
1304 | /* | |
1305 | * This should most likely only be called during fork() to see whether we | |
1306 | * should break the cow immediately for a page on the src mm. | |
1307 | */ | |
1308 | static inline bool page_needs_cow_for_dma(struct vm_area_struct *vma, | |
1309 | struct page *page) | |
1310 | { | |
1311 | if (!is_cow_mapping(vma->vm_flags)) | |
1312 | return false; | |
1313 | ||
a458b76a | 1314 | if (!test_bit(MMF_HAS_PINNED, &vma->vm_mm->flags)) |
97a7e473 PX |
1315 | return false; |
1316 | ||
1317 | return page_maybe_dma_pinned(page); | |
1318 | } | |
1319 | ||
9127ab4f CS |
1320 | #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP) |
1321 | #define SECTION_IN_PAGE_FLAGS | |
1322 | #endif | |
1323 | ||
89689ae7 | 1324 | /* |
7a8010cd VB |
1325 | * The identification function is mainly used by the buddy allocator for |
1326 | * determining if two pages could be buddies. We are not really identifying | |
1327 | * the zone since we could be using the section number id if we do not have | |
1328 | * node id available in page flags. | |
1329 | * We only guarantee that it will return the same value for two combinable | |
1330 | * pages in a zone. | |
89689ae7 | 1331 | */ |
cb2b95e1 AW |
1332 | static inline int page_zone_id(struct page *page) |
1333 | { | |
89689ae7 | 1334 | return (page->flags >> ZONEID_PGSHIFT) & ZONEID_MASK; |
348f8b6c DH |
1335 | } |
1336 | ||
89689ae7 | 1337 | #ifdef NODE_NOT_IN_PAGE_FLAGS |
33dd4e0e | 1338 | extern int page_to_nid(const struct page *page); |
89689ae7 | 1339 | #else |
33dd4e0e | 1340 | static inline int page_to_nid(const struct page *page) |
d41dee36 | 1341 | { |
f165b378 PT |
1342 | struct page *p = (struct page *)page; |
1343 | ||
1344 | return (PF_POISONED_CHECK(p)->flags >> NODES_PGSHIFT) & NODES_MASK; | |
d41dee36 | 1345 | } |
89689ae7 CL |
1346 | #endif |
1347 | ||
57e0a030 | 1348 | #ifdef CONFIG_NUMA_BALANCING |
90572890 | 1349 | static inline int cpu_pid_to_cpupid(int cpu, int pid) |
57e0a030 | 1350 | { |
90572890 | 1351 | return ((cpu & LAST__CPU_MASK) << LAST__PID_SHIFT) | (pid & LAST__PID_MASK); |
57e0a030 MG |
1352 | } |
1353 | ||
90572890 | 1354 | static inline int cpupid_to_pid(int cpupid) |
57e0a030 | 1355 | { |
90572890 | 1356 | return cpupid & LAST__PID_MASK; |
57e0a030 | 1357 | } |
b795854b | 1358 | |
90572890 | 1359 | static inline int cpupid_to_cpu(int cpupid) |
b795854b | 1360 | { |
90572890 | 1361 | return (cpupid >> LAST__PID_SHIFT) & LAST__CPU_MASK; |
b795854b MG |
1362 | } |
1363 | ||
90572890 | 1364 | static inline int cpupid_to_nid(int cpupid) |
b795854b | 1365 | { |
90572890 | 1366 | return cpu_to_node(cpupid_to_cpu(cpupid)); |
b795854b MG |
1367 | } |
1368 | ||
90572890 | 1369 | static inline bool cpupid_pid_unset(int cpupid) |
57e0a030 | 1370 | { |
90572890 | 1371 | return cpupid_to_pid(cpupid) == (-1 & LAST__PID_MASK); |
b795854b MG |
1372 | } |
1373 | ||
90572890 | 1374 | static inline bool cpupid_cpu_unset(int cpupid) |
b795854b | 1375 | { |
90572890 | 1376 | return cpupid_to_cpu(cpupid) == (-1 & LAST__CPU_MASK); |
b795854b MG |
1377 | } |
1378 | ||
8c8a743c PZ |
1379 | static inline bool __cpupid_match_pid(pid_t task_pid, int cpupid) |
1380 | { | |
1381 | return (task_pid & LAST__PID_MASK) == cpupid_to_pid(cpupid); | |
1382 | } | |
1383 | ||
1384 | #define cpupid_match_pid(task, cpupid) __cpupid_match_pid(task->pid, cpupid) | |
90572890 PZ |
1385 | #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS |
1386 | static inline int page_cpupid_xchg_last(struct page *page, int cpupid) | |
b795854b | 1387 | { |
1ae71d03 | 1388 | return xchg(&page->_last_cpupid, cpupid & LAST_CPUPID_MASK); |
b795854b | 1389 | } |
90572890 PZ |
1390 | |
1391 | static inline int page_cpupid_last(struct page *page) | |
1392 | { | |
1393 | return page->_last_cpupid; | |
1394 | } | |
1395 | static inline void page_cpupid_reset_last(struct page *page) | |
b795854b | 1396 | { |
1ae71d03 | 1397 | page->_last_cpupid = -1 & LAST_CPUPID_MASK; |
57e0a030 MG |
1398 | } |
1399 | #else | |
90572890 | 1400 | static inline int page_cpupid_last(struct page *page) |
75980e97 | 1401 | { |
90572890 | 1402 | return (page->flags >> LAST_CPUPID_PGSHIFT) & LAST_CPUPID_MASK; |
75980e97 PZ |
1403 | } |
1404 | ||
90572890 | 1405 | extern int page_cpupid_xchg_last(struct page *page, int cpupid); |
75980e97 | 1406 | |
90572890 | 1407 | static inline void page_cpupid_reset_last(struct page *page) |
75980e97 | 1408 | { |
09940a4f | 1409 | page->flags |= LAST_CPUPID_MASK << LAST_CPUPID_PGSHIFT; |
75980e97 | 1410 | } |
90572890 PZ |
1411 | #endif /* LAST_CPUPID_NOT_IN_PAGE_FLAGS */ |
1412 | #else /* !CONFIG_NUMA_BALANCING */ | |
1413 | static inline int page_cpupid_xchg_last(struct page *page, int cpupid) | |
57e0a030 | 1414 | { |
90572890 | 1415 | return page_to_nid(page); /* XXX */ |
57e0a030 MG |
1416 | } |
1417 | ||
90572890 | 1418 | static inline int page_cpupid_last(struct page *page) |
57e0a030 | 1419 | { |
90572890 | 1420 | return page_to_nid(page); /* XXX */ |
57e0a030 MG |
1421 | } |
1422 | ||
90572890 | 1423 | static inline int cpupid_to_nid(int cpupid) |
b795854b MG |
1424 | { |
1425 | return -1; | |
1426 | } | |
1427 | ||
90572890 | 1428 | static inline int cpupid_to_pid(int cpupid) |
b795854b MG |
1429 | { |
1430 | return -1; | |
1431 | } | |
1432 | ||
90572890 | 1433 | static inline int cpupid_to_cpu(int cpupid) |
b795854b MG |
1434 | { |
1435 | return -1; | |
1436 | } | |
1437 | ||
90572890 PZ |
1438 | static inline int cpu_pid_to_cpupid(int nid, int pid) |
1439 | { | |
1440 | return -1; | |
1441 | } | |
1442 | ||
1443 | static inline bool cpupid_pid_unset(int cpupid) | |
b795854b | 1444 | { |
2b787449 | 1445 | return true; |
b795854b MG |
1446 | } |
1447 | ||
90572890 | 1448 | static inline void page_cpupid_reset_last(struct page *page) |
57e0a030 MG |
1449 | { |
1450 | } | |
8c8a743c PZ |
1451 | |
1452 | static inline bool cpupid_match_pid(struct task_struct *task, int cpupid) | |
1453 | { | |
1454 | return false; | |
1455 | } | |
90572890 | 1456 | #endif /* CONFIG_NUMA_BALANCING */ |
57e0a030 | 1457 | |
2e903b91 | 1458 | #if defined(CONFIG_KASAN_SW_TAGS) || defined(CONFIG_KASAN_HW_TAGS) |
34303244 | 1459 | |
cf10bd4c AK |
1460 | /* |
1461 | * KASAN per-page tags are stored xor'ed with 0xff. This allows to avoid | |
1462 | * setting tags for all pages to native kernel tag value 0xff, as the default | |
1463 | * value 0x00 maps to 0xff. | |
1464 | */ | |
1465 | ||
2813b9c0 AK |
1466 | static inline u8 page_kasan_tag(const struct page *page) |
1467 | { | |
cf10bd4c AK |
1468 | u8 tag = 0xff; |
1469 | ||
1470 | if (kasan_enabled()) { | |
1471 | tag = (page->flags >> KASAN_TAG_PGSHIFT) & KASAN_TAG_MASK; | |
1472 | tag ^= 0xff; | |
1473 | } | |
1474 | ||
1475 | return tag; | |
2813b9c0 AK |
1476 | } |
1477 | ||
1478 | static inline void page_kasan_tag_set(struct page *page, u8 tag) | |
1479 | { | |
34303244 | 1480 | if (kasan_enabled()) { |
cf10bd4c | 1481 | tag ^= 0xff; |
34303244 AK |
1482 | page->flags &= ~(KASAN_TAG_MASK << KASAN_TAG_PGSHIFT); |
1483 | page->flags |= (tag & KASAN_TAG_MASK) << KASAN_TAG_PGSHIFT; | |
1484 | } | |
2813b9c0 AK |
1485 | } |
1486 | ||
1487 | static inline void page_kasan_tag_reset(struct page *page) | |
1488 | { | |
34303244 AK |
1489 | if (kasan_enabled()) |
1490 | page_kasan_tag_set(page, 0xff); | |
2813b9c0 | 1491 | } |
34303244 AK |
1492 | |
1493 | #else /* CONFIG_KASAN_SW_TAGS || CONFIG_KASAN_HW_TAGS */ | |
1494 | ||
2813b9c0 AK |
1495 | static inline u8 page_kasan_tag(const struct page *page) |
1496 | { | |
1497 | return 0xff; | |
1498 | } | |
1499 | ||
1500 | static inline void page_kasan_tag_set(struct page *page, u8 tag) { } | |
1501 | static inline void page_kasan_tag_reset(struct page *page) { } | |
34303244 AK |
1502 | |
1503 | #endif /* CONFIG_KASAN_SW_TAGS || CONFIG_KASAN_HW_TAGS */ | |
2813b9c0 | 1504 | |
33dd4e0e | 1505 | static inline struct zone *page_zone(const struct page *page) |
89689ae7 CL |
1506 | { |
1507 | return &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)]; | |
1508 | } | |
1509 | ||
75ef7184 MG |
1510 | static inline pg_data_t *page_pgdat(const struct page *page) |
1511 | { | |
1512 | return NODE_DATA(page_to_nid(page)); | |
1513 | } | |
1514 | ||
9127ab4f | 1515 | #ifdef SECTION_IN_PAGE_FLAGS |
bf4e8902 DK |
1516 | static inline void set_page_section(struct page *page, unsigned long section) |
1517 | { | |
1518 | page->flags &= ~(SECTIONS_MASK << SECTIONS_PGSHIFT); | |
1519 | page->flags |= (section & SECTIONS_MASK) << SECTIONS_PGSHIFT; | |
1520 | } | |
1521 | ||
aa462abe | 1522 | static inline unsigned long page_to_section(const struct page *page) |
d41dee36 AW |
1523 | { |
1524 | return (page->flags >> SECTIONS_PGSHIFT) & SECTIONS_MASK; | |
1525 | } | |
308c05e3 | 1526 | #endif |
d41dee36 | 1527 | |
8e3560d9 PT |
1528 | /* MIGRATE_CMA and ZONE_MOVABLE do not allow pin pages */ |
1529 | #ifdef CONFIG_MIGRATION | |
1530 | static inline bool is_pinnable_page(struct page *page) | |
1531 | { | |
9afaf30f PT |
1532 | return !(is_zone_movable_page(page) || is_migrate_cma_page(page)) || |
1533 | is_zero_pfn(page_to_pfn(page)); | |
8e3560d9 PT |
1534 | } |
1535 | #else | |
1536 | static inline bool is_pinnable_page(struct page *page) | |
1537 | { | |
1538 | return true; | |
1539 | } | |
1540 | #endif | |
1541 | ||
2f1b6248 | 1542 | static inline void set_page_zone(struct page *page, enum zone_type zone) |
348f8b6c DH |
1543 | { |
1544 | page->flags &= ~(ZONES_MASK << ZONES_PGSHIFT); | |
1545 | page->flags |= (zone & ZONES_MASK) << ZONES_PGSHIFT; | |
1546 | } | |
2f1b6248 | 1547 | |
348f8b6c DH |
1548 | static inline void set_page_node(struct page *page, unsigned long node) |
1549 | { | |
1550 | page->flags &= ~(NODES_MASK << NODES_PGSHIFT); | |
1551 | page->flags |= (node & NODES_MASK) << NODES_PGSHIFT; | |
1da177e4 | 1552 | } |
89689ae7 | 1553 | |
2f1b6248 | 1554 | static inline void set_page_links(struct page *page, enum zone_type zone, |
d41dee36 | 1555 | unsigned long node, unsigned long pfn) |
1da177e4 | 1556 | { |
348f8b6c DH |
1557 | set_page_zone(page, zone); |
1558 | set_page_node(page, node); | |
9127ab4f | 1559 | #ifdef SECTION_IN_PAGE_FLAGS |
d41dee36 | 1560 | set_page_section(page, pfn_to_section_nr(pfn)); |
bf4e8902 | 1561 | #endif |
1da177e4 LT |
1562 | } |
1563 | ||
f6ac2354 CL |
1564 | /* |
1565 | * Some inline functions in vmstat.h depend on page_zone() | |
1566 | */ | |
1567 | #include <linux/vmstat.h> | |
1568 | ||
33dd4e0e | 1569 | static __always_inline void *lowmem_page_address(const struct page *page) |
1da177e4 | 1570 | { |
1dff8083 | 1571 | return page_to_virt(page); |
1da177e4 LT |
1572 | } |
1573 | ||
1574 | #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL) | |
1575 | #define HASHED_PAGE_VIRTUAL | |
1576 | #endif | |
1577 | ||
1578 | #if defined(WANT_PAGE_VIRTUAL) | |
f92f455f GU |
1579 | static inline void *page_address(const struct page *page) |
1580 | { | |
1581 | return page->virtual; | |
1582 | } | |
1583 | static inline void set_page_address(struct page *page, void *address) | |
1584 | { | |
1585 | page->virtual = address; | |
1586 | } | |
1da177e4 LT |
1587 | #define page_address_init() do { } while(0) |
1588 | #endif | |
1589 | ||
1590 | #if defined(HASHED_PAGE_VIRTUAL) | |
f9918794 | 1591 | void *page_address(const struct page *page); |
1da177e4 LT |
1592 | void set_page_address(struct page *page, void *virtual); |
1593 | void page_address_init(void); | |
1594 | #endif | |
1595 | ||
1596 | #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL) | |
1597 | #define page_address(page) lowmem_page_address(page) | |
1598 | #define set_page_address(page, address) do { } while(0) | |
1599 | #define page_address_init() do { } while(0) | |
1600 | #endif | |
1601 | ||
e39155ea KS |
1602 | extern void *page_rmapping(struct page *page); |
1603 | extern struct anon_vma *page_anon_vma(struct page *page); | |
9800339b | 1604 | extern struct address_space *page_mapping(struct page *page); |
1da177e4 | 1605 | |
f981c595 MG |
1606 | extern struct address_space *__page_file_mapping(struct page *); |
1607 | ||
1608 | static inline | |
1609 | struct address_space *page_file_mapping(struct page *page) | |
1610 | { | |
1611 | if (unlikely(PageSwapCache(page))) | |
1612 | return __page_file_mapping(page); | |
1613 | ||
1614 | return page->mapping; | |
1615 | } | |
1616 | ||
f6ab1f7f HY |
1617 | extern pgoff_t __page_file_index(struct page *page); |
1618 | ||
1da177e4 LT |
1619 | /* |
1620 | * Return the pagecache index of the passed page. Regular pagecache pages | |
f6ab1f7f | 1621 | * use ->index whereas swapcache pages use swp_offset(->private) |
1da177e4 LT |
1622 | */ |
1623 | static inline pgoff_t page_index(struct page *page) | |
1624 | { | |
1625 | if (unlikely(PageSwapCache(page))) | |
f6ab1f7f | 1626 | return __page_file_index(page); |
1da177e4 LT |
1627 | return page->index; |
1628 | } | |
1629 | ||
1aa8aea5 | 1630 | bool page_mapped(struct page *page); |
bda807d4 | 1631 | struct address_space *page_mapping(struct page *page); |
1da177e4 | 1632 | |
2f064f34 MH |
1633 | /* |
1634 | * Return true only if the page has been allocated with | |
1635 | * ALLOC_NO_WATERMARKS and the low watermark was not | |
1636 | * met implying that the system is under some pressure. | |
1637 | */ | |
1d7bab6a | 1638 | static inline bool page_is_pfmemalloc(const struct page *page) |
2f064f34 MH |
1639 | { |
1640 | /* | |
c07aea3e MC |
1641 | * lru.next has bit 1 set if the page is allocated from the |
1642 | * pfmemalloc reserves. Callers may simply overwrite it if | |
1643 | * they do not need to preserve that information. | |
2f064f34 | 1644 | */ |
c07aea3e | 1645 | return (uintptr_t)page->lru.next & BIT(1); |
2f064f34 MH |
1646 | } |
1647 | ||
1648 | /* | |
1649 | * Only to be called by the page allocator on a freshly allocated | |
1650 | * page. | |
1651 | */ | |
1652 | static inline void set_page_pfmemalloc(struct page *page) | |
1653 | { | |
c07aea3e | 1654 | page->lru.next = (void *)BIT(1); |
2f064f34 MH |
1655 | } |
1656 | ||
1657 | static inline void clear_page_pfmemalloc(struct page *page) | |
1658 | { | |
c07aea3e | 1659 | page->lru.next = NULL; |
2f064f34 MH |
1660 | } |
1661 | ||
1c0fe6e3 NP |
1662 | /* |
1663 | * Can be called by the pagefault handler when it gets a VM_FAULT_OOM. | |
1664 | */ | |
1665 | extern void pagefault_out_of_memory(void); | |
1666 | ||
1da177e4 | 1667 | #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK) |
ee6c400f | 1668 | #define offset_in_thp(page, p) ((unsigned long)(p) & (thp_size(page) - 1)) |
1da177e4 | 1669 | |
ddd588b5 | 1670 | /* |
7bf02ea2 | 1671 | * Flags passed to show_mem() and show_free_areas() to suppress output in |
ddd588b5 DR |
1672 | * various contexts. |
1673 | */ | |
4b59e6c4 | 1674 | #define SHOW_MEM_FILTER_NODES (0x0001u) /* disallowed nodes */ |
ddd588b5 | 1675 | |
9af744d7 | 1676 | extern void show_free_areas(unsigned int flags, nodemask_t *nodemask); |
1da177e4 | 1677 | |
710ec38b | 1678 | #ifdef CONFIG_MMU |
7f43add4 | 1679 | extern bool can_do_mlock(void); |
710ec38b AB |
1680 | #else |
1681 | static inline bool can_do_mlock(void) { return false; } | |
1682 | #endif | |
d7c9e99a AG |
1683 | extern int user_shm_lock(size_t, struct ucounts *); |
1684 | extern void user_shm_unlock(size_t, struct ucounts *); | |
1da177e4 LT |
1685 | |
1686 | /* | |
1687 | * Parameter block passed down to zap_pte_range in exceptional cases. | |
1688 | */ | |
1689 | struct zap_details { | |
91b61ef3 | 1690 | struct address_space *zap_mapping; /* Check page->mapping if set */ |
22061a1f | 1691 | struct page *single_page; /* Locked page to be unmapped */ |
1da177e4 LT |
1692 | }; |
1693 | ||
91b61ef3 PX |
1694 | /* |
1695 | * We set details->zap_mappings when we want to unmap shared but keep private | |
1696 | * pages. Return true if skip zapping this page, false otherwise. | |
1697 | */ | |
1698 | static inline bool | |
1699 | zap_skip_check_mapping(struct zap_details *details, struct page *page) | |
1700 | { | |
1701 | if (!details || !page) | |
1702 | return false; | |
1703 | ||
1704 | return details->zap_mapping && | |
1705 | (details->zap_mapping != page_rmapping(page)); | |
1706 | } | |
1707 | ||
25b2995a CH |
1708 | struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr, |
1709 | pte_t pte); | |
28093f9f GS |
1710 | struct page *vm_normal_page_pmd(struct vm_area_struct *vma, unsigned long addr, |
1711 | pmd_t pmd); | |
7e675137 | 1712 | |
27d036e3 LR |
1713 | void zap_vma_ptes(struct vm_area_struct *vma, unsigned long address, |
1714 | unsigned long size); | |
14f5ff5d | 1715 | void zap_page_range(struct vm_area_struct *vma, unsigned long address, |
27d036e3 | 1716 | unsigned long size); |
4f74d2c8 LT |
1717 | void unmap_vmas(struct mmu_gather *tlb, struct vm_area_struct *start_vma, |
1718 | unsigned long start, unsigned long end); | |
e6473092 | 1719 | |
ac46d4f3 JG |
1720 | struct mmu_notifier_range; |
1721 | ||
42b77728 | 1722 | void free_pgd_range(struct mmu_gather *tlb, unsigned long addr, |
3bf5ee95 | 1723 | unsigned long end, unsigned long floor, unsigned long ceiling); |
c78f4636 PX |
1724 | int |
1725 | copy_page_range(struct vm_area_struct *dst_vma, struct vm_area_struct *src_vma); | |
9fd6dad1 PB |
1726 | int follow_invalidate_pte(struct mm_struct *mm, unsigned long address, |
1727 | struct mmu_notifier_range *range, pte_t **ptepp, | |
1728 | pmd_t **pmdpp, spinlock_t **ptlp); | |
ff5c19ed | 1729 | int follow_pte(struct mm_struct *mm, unsigned long address, |
9fd6dad1 | 1730 | pte_t **ptepp, spinlock_t **ptlp); |
3b6748e2 JW |
1731 | int follow_pfn(struct vm_area_struct *vma, unsigned long address, |
1732 | unsigned long *pfn); | |
d87fe660 | 1733 | int follow_phys(struct vm_area_struct *vma, unsigned long address, |
1734 | unsigned int flags, unsigned long *prot, resource_size_t *phys); | |
28b2ee20 RR |
1735 | int generic_access_phys(struct vm_area_struct *vma, unsigned long addr, |
1736 | void *buf, int len, int write); | |
1da177e4 | 1737 | |
7caef267 | 1738 | extern void truncate_pagecache(struct inode *inode, loff_t new); |
2c27c65e | 1739 | extern void truncate_setsize(struct inode *inode, loff_t newsize); |
90a80202 | 1740 | void pagecache_isize_extended(struct inode *inode, loff_t from, loff_t to); |
623e3db9 | 1741 | void truncate_pagecache_range(struct inode *inode, loff_t offset, loff_t end); |
750b4987 | 1742 | int truncate_inode_page(struct address_space *mapping, struct page *page); |
25718736 | 1743 | int generic_error_remove_page(struct address_space *mapping, struct page *page); |
83f78668 WF |
1744 | int invalidate_inode_page(struct page *page); |
1745 | ||
7ee1dd3f | 1746 | #ifdef CONFIG_MMU |
2b740303 | 1747 | extern vm_fault_t handle_mm_fault(struct vm_area_struct *vma, |
bce617ed PX |
1748 | unsigned long address, unsigned int flags, |
1749 | struct pt_regs *regs); | |
64019a2e | 1750 | extern int fixup_user_fault(struct mm_struct *mm, |
4a9e1cda DD |
1751 | unsigned long address, unsigned int fault_flags, |
1752 | bool *unlocked); | |
22061a1f | 1753 | void unmap_mapping_page(struct page *page); |
977fbdcd MW |
1754 | void unmap_mapping_pages(struct address_space *mapping, |
1755 | pgoff_t start, pgoff_t nr, bool even_cows); | |
1756 | void unmap_mapping_range(struct address_space *mapping, | |
1757 | loff_t const holebegin, loff_t const holelen, int even_cows); | |
7ee1dd3f | 1758 | #else |
2b740303 | 1759 | static inline vm_fault_t handle_mm_fault(struct vm_area_struct *vma, |
bce617ed PX |
1760 | unsigned long address, unsigned int flags, |
1761 | struct pt_regs *regs) | |
7ee1dd3f DH |
1762 | { |
1763 | /* should never happen if there's no MMU */ | |
1764 | BUG(); | |
1765 | return VM_FAULT_SIGBUS; | |
1766 | } | |
64019a2e | 1767 | static inline int fixup_user_fault(struct mm_struct *mm, unsigned long address, |
4a9e1cda | 1768 | unsigned int fault_flags, bool *unlocked) |
5c723ba5 PZ |
1769 | { |
1770 | /* should never happen if there's no MMU */ | |
1771 | BUG(); | |
1772 | return -EFAULT; | |
1773 | } | |
22061a1f | 1774 | static inline void unmap_mapping_page(struct page *page) { } |
977fbdcd MW |
1775 | static inline void unmap_mapping_pages(struct address_space *mapping, |
1776 | pgoff_t start, pgoff_t nr, bool even_cows) { } | |
1777 | static inline void unmap_mapping_range(struct address_space *mapping, | |
1778 | loff_t const holebegin, loff_t const holelen, int even_cows) { } | |
7ee1dd3f | 1779 | #endif |
f33ea7f4 | 1780 | |
977fbdcd MW |
1781 | static inline void unmap_shared_mapping_range(struct address_space *mapping, |
1782 | loff_t const holebegin, loff_t const holelen) | |
1783 | { | |
1784 | unmap_mapping_range(mapping, holebegin, holelen, 0); | |
1785 | } | |
1786 | ||
1787 | extern int access_process_vm(struct task_struct *tsk, unsigned long addr, | |
1788 | void *buf, int len, unsigned int gup_flags); | |
5ddd36b9 | 1789 | extern int access_remote_vm(struct mm_struct *mm, unsigned long addr, |
6347e8d5 | 1790 | void *buf, int len, unsigned int gup_flags); |
d3f5ffca JH |
1791 | extern int __access_remote_vm(struct mm_struct *mm, unsigned long addr, |
1792 | void *buf, int len, unsigned int gup_flags); | |
1da177e4 | 1793 | |
64019a2e | 1794 | long get_user_pages_remote(struct mm_struct *mm, |
1e987790 | 1795 | unsigned long start, unsigned long nr_pages, |
9beae1ea | 1796 | unsigned int gup_flags, struct page **pages, |
5b56d49f | 1797 | struct vm_area_struct **vmas, int *locked); |
64019a2e | 1798 | long pin_user_pages_remote(struct mm_struct *mm, |
eddb1c22 JH |
1799 | unsigned long start, unsigned long nr_pages, |
1800 | unsigned int gup_flags, struct page **pages, | |
1801 | struct vm_area_struct **vmas, int *locked); | |
c12d2da5 | 1802 | long get_user_pages(unsigned long start, unsigned long nr_pages, |
768ae309 | 1803 | unsigned int gup_flags, struct page **pages, |
cde70140 | 1804 | struct vm_area_struct **vmas); |
eddb1c22 JH |
1805 | long pin_user_pages(unsigned long start, unsigned long nr_pages, |
1806 | unsigned int gup_flags, struct page **pages, | |
1807 | struct vm_area_struct **vmas); | |
c12d2da5 | 1808 | long get_user_pages_locked(unsigned long start, unsigned long nr_pages, |
3b913179 | 1809 | unsigned int gup_flags, struct page **pages, int *locked); |
420c2091 JH |
1810 | long pin_user_pages_locked(unsigned long start, unsigned long nr_pages, |
1811 | unsigned int gup_flags, struct page **pages, int *locked); | |
c12d2da5 | 1812 | long get_user_pages_unlocked(unsigned long start, unsigned long nr_pages, |
c164154f | 1813 | struct page **pages, unsigned int gup_flags); |
91429023 JH |
1814 | long pin_user_pages_unlocked(unsigned long start, unsigned long nr_pages, |
1815 | struct page **pages, unsigned int gup_flags); | |
9a4e9f3b | 1816 | |
73b0140b IW |
1817 | int get_user_pages_fast(unsigned long start, int nr_pages, |
1818 | unsigned int gup_flags, struct page **pages); | |
eddb1c22 JH |
1819 | int pin_user_pages_fast(unsigned long start, int nr_pages, |
1820 | unsigned int gup_flags, struct page **pages); | |
8025e5dd | 1821 | |
79eb597c DJ |
1822 | int account_locked_vm(struct mm_struct *mm, unsigned long pages, bool inc); |
1823 | int __account_locked_vm(struct mm_struct *mm, unsigned long pages, bool inc, | |
1824 | struct task_struct *task, bool bypass_rlim); | |
1825 | ||
18022c5d MG |
1826 | struct kvec; |
1827 | int get_kernel_pages(const struct kvec *iov, int nr_pages, int write, | |
1828 | struct page **pages); | |
f3e8fccd | 1829 | struct page *get_dump_page(unsigned long addr); |
1da177e4 | 1830 | |
cf9a2ae8 | 1831 | extern int try_to_release_page(struct page * page, gfp_t gfp_mask); |
d47992f8 LC |
1832 | extern void do_invalidatepage(struct page *page, unsigned int offset, |
1833 | unsigned int length); | |
cf9a2ae8 | 1834 | |
1da177e4 LT |
1835 | int redirty_page_for_writepage(struct writeback_control *wbc, |
1836 | struct page *page); | |
c4843a75 | 1837 | void account_page_cleaned(struct page *page, struct address_space *mapping, |
62cccb8c | 1838 | struct bdi_writeback *wb); |
b3c97528 | 1839 | int set_page_dirty(struct page *page); |
1da177e4 | 1840 | int set_page_dirty_lock(struct page *page); |
736304f3 JK |
1841 | void __cancel_dirty_page(struct page *page); |
1842 | static inline void cancel_dirty_page(struct page *page) | |
1843 | { | |
1844 | /* Avoid atomic ops, locking, etc. when not actually needed. */ | |
1845 | if (PageDirty(page)) | |
1846 | __cancel_dirty_page(page); | |
1847 | } | |
1da177e4 | 1848 | int clear_page_dirty_for_io(struct page *page); |
b9ea2515 | 1849 | |
a9090253 | 1850 | int get_cmdline(struct task_struct *task, char *buffer, int buflen); |
1da177e4 | 1851 | |
b6a2fea3 OW |
1852 | extern unsigned long move_page_tables(struct vm_area_struct *vma, |
1853 | unsigned long old_addr, struct vm_area_struct *new_vma, | |
38a76013 ML |
1854 | unsigned long new_addr, unsigned long len, |
1855 | bool need_rmap_locks); | |
58705444 PX |
1856 | |
1857 | /* | |
1858 | * Flags used by change_protection(). For now we make it a bitmap so | |
1859 | * that we can pass in multiple flags just like parameters. However | |
1860 | * for now all the callers are only use one of the flags at the same | |
1861 | * time. | |
1862 | */ | |
1863 | /* Whether we should allow dirty bit accounting */ | |
1864 | #define MM_CP_DIRTY_ACCT (1UL << 0) | |
1865 | /* Whether this protection change is for NUMA hints */ | |
1866 | #define MM_CP_PROT_NUMA (1UL << 1) | |
292924b2 PX |
1867 | /* Whether this change is for write protecting */ |
1868 | #define MM_CP_UFFD_WP (1UL << 2) /* do wp */ | |
1869 | #define MM_CP_UFFD_WP_RESOLVE (1UL << 3) /* Resolve wp */ | |
1870 | #define MM_CP_UFFD_WP_ALL (MM_CP_UFFD_WP | \ | |
1871 | MM_CP_UFFD_WP_RESOLVE) | |
58705444 | 1872 | |
7da4d641 PZ |
1873 | extern unsigned long change_protection(struct vm_area_struct *vma, unsigned long start, |
1874 | unsigned long end, pgprot_t newprot, | |
58705444 | 1875 | unsigned long cp_flags); |
b6a2fea3 OW |
1876 | extern int mprotect_fixup(struct vm_area_struct *vma, |
1877 | struct vm_area_struct **pprev, unsigned long start, | |
1878 | unsigned long end, unsigned long newflags); | |
1da177e4 | 1879 | |
465a454f PZ |
1880 | /* |
1881 | * doesn't attempt to fault and will return short. | |
1882 | */ | |
dadbb612 SJ |
1883 | int get_user_pages_fast_only(unsigned long start, int nr_pages, |
1884 | unsigned int gup_flags, struct page **pages); | |
104acc32 JH |
1885 | int pin_user_pages_fast_only(unsigned long start, int nr_pages, |
1886 | unsigned int gup_flags, struct page **pages); | |
dadbb612 SJ |
1887 | |
1888 | static inline bool get_user_page_fast_only(unsigned long addr, | |
1889 | unsigned int gup_flags, struct page **pagep) | |
1890 | { | |
1891 | return get_user_pages_fast_only(addr, 1, gup_flags, pagep) == 1; | |
1892 | } | |
d559db08 KH |
1893 | /* |
1894 | * per-process(per-mm_struct) statistics. | |
1895 | */ | |
d559db08 KH |
1896 | static inline unsigned long get_mm_counter(struct mm_struct *mm, int member) |
1897 | { | |
69c97823 KK |
1898 | long val = atomic_long_read(&mm->rss_stat.count[member]); |
1899 | ||
1900 | #ifdef SPLIT_RSS_COUNTING | |
1901 | /* | |
1902 | * counter is updated in asynchronous manner and may go to minus. | |
1903 | * But it's never be expected number for users. | |
1904 | */ | |
1905 | if (val < 0) | |
1906 | val = 0; | |
172703b0 | 1907 | #endif |
69c97823 KK |
1908 | return (unsigned long)val; |
1909 | } | |
d559db08 | 1910 | |
e4dcad20 | 1911 | void mm_trace_rss_stat(struct mm_struct *mm, int member, long count); |
b3d1411b | 1912 | |
d559db08 KH |
1913 | static inline void add_mm_counter(struct mm_struct *mm, int member, long value) |
1914 | { | |
b3d1411b JFG |
1915 | long count = atomic_long_add_return(value, &mm->rss_stat.count[member]); |
1916 | ||
e4dcad20 | 1917 | mm_trace_rss_stat(mm, member, count); |
d559db08 KH |
1918 | } |
1919 | ||
1920 | static inline void inc_mm_counter(struct mm_struct *mm, int member) | |
1921 | { | |
b3d1411b JFG |
1922 | long count = atomic_long_inc_return(&mm->rss_stat.count[member]); |
1923 | ||
e4dcad20 | 1924 | mm_trace_rss_stat(mm, member, count); |
d559db08 KH |
1925 | } |
1926 | ||
1927 | static inline void dec_mm_counter(struct mm_struct *mm, int member) | |
1928 | { | |
b3d1411b JFG |
1929 | long count = atomic_long_dec_return(&mm->rss_stat.count[member]); |
1930 | ||
e4dcad20 | 1931 | mm_trace_rss_stat(mm, member, count); |
d559db08 KH |
1932 | } |
1933 | ||
eca56ff9 JM |
1934 | /* Optimized variant when page is already known not to be PageAnon */ |
1935 | static inline int mm_counter_file(struct page *page) | |
1936 | { | |
1937 | if (PageSwapBacked(page)) | |
1938 | return MM_SHMEMPAGES; | |
1939 | return MM_FILEPAGES; | |
1940 | } | |
1941 | ||
1942 | static inline int mm_counter(struct page *page) | |
1943 | { | |
1944 | if (PageAnon(page)) | |
1945 | return MM_ANONPAGES; | |
1946 | return mm_counter_file(page); | |
1947 | } | |
1948 | ||
d559db08 KH |
1949 | static inline unsigned long get_mm_rss(struct mm_struct *mm) |
1950 | { | |
1951 | return get_mm_counter(mm, MM_FILEPAGES) + | |
eca56ff9 JM |
1952 | get_mm_counter(mm, MM_ANONPAGES) + |
1953 | get_mm_counter(mm, MM_SHMEMPAGES); | |
d559db08 KH |
1954 | } |
1955 | ||
1956 | static inline unsigned long get_mm_hiwater_rss(struct mm_struct *mm) | |
1957 | { | |
1958 | return max(mm->hiwater_rss, get_mm_rss(mm)); | |
1959 | } | |
1960 | ||
1961 | static inline unsigned long get_mm_hiwater_vm(struct mm_struct *mm) | |
1962 | { | |
1963 | return max(mm->hiwater_vm, mm->total_vm); | |
1964 | } | |
1965 | ||
1966 | static inline void update_hiwater_rss(struct mm_struct *mm) | |
1967 | { | |
1968 | unsigned long _rss = get_mm_rss(mm); | |
1969 | ||
1970 | if ((mm)->hiwater_rss < _rss) | |
1971 | (mm)->hiwater_rss = _rss; | |
1972 | } | |
1973 | ||
1974 | static inline void update_hiwater_vm(struct mm_struct *mm) | |
1975 | { | |
1976 | if (mm->hiwater_vm < mm->total_vm) | |
1977 | mm->hiwater_vm = mm->total_vm; | |
1978 | } | |
1979 | ||
695f0559 PC |
1980 | static inline void reset_mm_hiwater_rss(struct mm_struct *mm) |
1981 | { | |
1982 | mm->hiwater_rss = get_mm_rss(mm); | |
1983 | } | |
1984 | ||
d559db08 KH |
1985 | static inline void setmax_mm_hiwater_rss(unsigned long *maxrss, |
1986 | struct mm_struct *mm) | |
1987 | { | |
1988 | unsigned long hiwater_rss = get_mm_hiwater_rss(mm); | |
1989 | ||
1990 | if (*maxrss < hiwater_rss) | |
1991 | *maxrss = hiwater_rss; | |
1992 | } | |
1993 | ||
53bddb4e | 1994 | #if defined(SPLIT_RSS_COUNTING) |
05af2e10 | 1995 | void sync_mm_rss(struct mm_struct *mm); |
53bddb4e | 1996 | #else |
05af2e10 | 1997 | static inline void sync_mm_rss(struct mm_struct *mm) |
53bddb4e KH |
1998 | { |
1999 | } | |
2000 | #endif | |
465a454f | 2001 | |
78e7c5af AK |
2002 | #ifndef CONFIG_ARCH_HAS_PTE_SPECIAL |
2003 | static inline int pte_special(pte_t pte) | |
2004 | { | |
2005 | return 0; | |
2006 | } | |
2007 | ||
2008 | static inline pte_t pte_mkspecial(pte_t pte) | |
2009 | { | |
2010 | return pte; | |
2011 | } | |
2012 | #endif | |
2013 | ||
17596731 | 2014 | #ifndef CONFIG_ARCH_HAS_PTE_DEVMAP |
3565fce3 DW |
2015 | static inline int pte_devmap(pte_t pte) |
2016 | { | |
2017 | return 0; | |
2018 | } | |
2019 | #endif | |
2020 | ||
6d2329f8 | 2021 | int vma_wants_writenotify(struct vm_area_struct *vma, pgprot_t vm_page_prot); |
d08b3851 | 2022 | |
25ca1d6c NK |
2023 | extern pte_t *__get_locked_pte(struct mm_struct *mm, unsigned long addr, |
2024 | spinlock_t **ptl); | |
2025 | static inline pte_t *get_locked_pte(struct mm_struct *mm, unsigned long addr, | |
2026 | spinlock_t **ptl) | |
2027 | { | |
2028 | pte_t *ptep; | |
2029 | __cond_lock(*ptl, ptep = __get_locked_pte(mm, addr, ptl)); | |
2030 | return ptep; | |
2031 | } | |
c9cfcddf | 2032 | |
c2febafc KS |
2033 | #ifdef __PAGETABLE_P4D_FOLDED |
2034 | static inline int __p4d_alloc(struct mm_struct *mm, pgd_t *pgd, | |
2035 | unsigned long address) | |
2036 | { | |
2037 | return 0; | |
2038 | } | |
2039 | #else | |
2040 | int __p4d_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address); | |
2041 | #endif | |
2042 | ||
b4e98d9a | 2043 | #if defined(__PAGETABLE_PUD_FOLDED) || !defined(CONFIG_MMU) |
c2febafc | 2044 | static inline int __pud_alloc(struct mm_struct *mm, p4d_t *p4d, |
5f22df00 NP |
2045 | unsigned long address) |
2046 | { | |
2047 | return 0; | |
2048 | } | |
b4e98d9a KS |
2049 | static inline void mm_inc_nr_puds(struct mm_struct *mm) {} |
2050 | static inline void mm_dec_nr_puds(struct mm_struct *mm) {} | |
2051 | ||
5f22df00 | 2052 | #else |
c2febafc | 2053 | int __pud_alloc(struct mm_struct *mm, p4d_t *p4d, unsigned long address); |
b4e98d9a | 2054 | |
b4e98d9a KS |
2055 | static inline void mm_inc_nr_puds(struct mm_struct *mm) |
2056 | { | |
6d212db1 MS |
2057 | if (mm_pud_folded(mm)) |
2058 | return; | |
af5b0f6a | 2059 | atomic_long_add(PTRS_PER_PUD * sizeof(pud_t), &mm->pgtables_bytes); |
b4e98d9a KS |
2060 | } |
2061 | ||
2062 | static inline void mm_dec_nr_puds(struct mm_struct *mm) | |
2063 | { | |
6d212db1 MS |
2064 | if (mm_pud_folded(mm)) |
2065 | return; | |
af5b0f6a | 2066 | atomic_long_sub(PTRS_PER_PUD * sizeof(pud_t), &mm->pgtables_bytes); |
b4e98d9a | 2067 | } |
5f22df00 NP |
2068 | #endif |
2069 | ||
2d2f5119 | 2070 | #if defined(__PAGETABLE_PMD_FOLDED) || !defined(CONFIG_MMU) |
5f22df00 NP |
2071 | static inline int __pmd_alloc(struct mm_struct *mm, pud_t *pud, |
2072 | unsigned long address) | |
2073 | { | |
2074 | return 0; | |
2075 | } | |
dc6c9a35 | 2076 | |
dc6c9a35 KS |
2077 | static inline void mm_inc_nr_pmds(struct mm_struct *mm) {} |
2078 | static inline void mm_dec_nr_pmds(struct mm_struct *mm) {} | |
2079 | ||
5f22df00 | 2080 | #else |
1bb3630e | 2081 | int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address); |
dc6c9a35 | 2082 | |
dc6c9a35 KS |
2083 | static inline void mm_inc_nr_pmds(struct mm_struct *mm) |
2084 | { | |
6d212db1 MS |
2085 | if (mm_pmd_folded(mm)) |
2086 | return; | |
af5b0f6a | 2087 | atomic_long_add(PTRS_PER_PMD * sizeof(pmd_t), &mm->pgtables_bytes); |
dc6c9a35 KS |
2088 | } |
2089 | ||
2090 | static inline void mm_dec_nr_pmds(struct mm_struct *mm) | |
2091 | { | |
6d212db1 MS |
2092 | if (mm_pmd_folded(mm)) |
2093 | return; | |
af5b0f6a | 2094 | atomic_long_sub(PTRS_PER_PMD * sizeof(pmd_t), &mm->pgtables_bytes); |
dc6c9a35 | 2095 | } |
5f22df00 NP |
2096 | #endif |
2097 | ||
c4812909 | 2098 | #ifdef CONFIG_MMU |
af5b0f6a | 2099 | static inline void mm_pgtables_bytes_init(struct mm_struct *mm) |
c4812909 | 2100 | { |
af5b0f6a | 2101 | atomic_long_set(&mm->pgtables_bytes, 0); |
c4812909 KS |
2102 | } |
2103 | ||
af5b0f6a | 2104 | static inline unsigned long mm_pgtables_bytes(const struct mm_struct *mm) |
c4812909 | 2105 | { |
af5b0f6a | 2106 | return atomic_long_read(&mm->pgtables_bytes); |
c4812909 KS |
2107 | } |
2108 | ||
2109 | static inline void mm_inc_nr_ptes(struct mm_struct *mm) | |
2110 | { | |
af5b0f6a | 2111 | atomic_long_add(PTRS_PER_PTE * sizeof(pte_t), &mm->pgtables_bytes); |
c4812909 KS |
2112 | } |
2113 | ||
2114 | static inline void mm_dec_nr_ptes(struct mm_struct *mm) | |
2115 | { | |
af5b0f6a | 2116 | atomic_long_sub(PTRS_PER_PTE * sizeof(pte_t), &mm->pgtables_bytes); |
c4812909 KS |
2117 | } |
2118 | #else | |
c4812909 | 2119 | |
af5b0f6a KS |
2120 | static inline void mm_pgtables_bytes_init(struct mm_struct *mm) {} |
2121 | static inline unsigned long mm_pgtables_bytes(const struct mm_struct *mm) | |
c4812909 KS |
2122 | { |
2123 | return 0; | |
2124 | } | |
2125 | ||
2126 | static inline void mm_inc_nr_ptes(struct mm_struct *mm) {} | |
2127 | static inline void mm_dec_nr_ptes(struct mm_struct *mm) {} | |
2128 | #endif | |
2129 | ||
4cf58924 JFG |
2130 | int __pte_alloc(struct mm_struct *mm, pmd_t *pmd); |
2131 | int __pte_alloc_kernel(pmd_t *pmd); | |
1bb3630e | 2132 | |
f949286c MR |
2133 | #if defined(CONFIG_MMU) |
2134 | ||
c2febafc KS |
2135 | static inline p4d_t *p4d_alloc(struct mm_struct *mm, pgd_t *pgd, |
2136 | unsigned long address) | |
2137 | { | |
2138 | return (unlikely(pgd_none(*pgd)) && __p4d_alloc(mm, pgd, address)) ? | |
2139 | NULL : p4d_offset(pgd, address); | |
2140 | } | |
2141 | ||
2142 | static inline pud_t *pud_alloc(struct mm_struct *mm, p4d_t *p4d, | |
2143 | unsigned long address) | |
1da177e4 | 2144 | { |
c2febafc KS |
2145 | return (unlikely(p4d_none(*p4d)) && __pud_alloc(mm, p4d, address)) ? |
2146 | NULL : pud_offset(p4d, address); | |
1da177e4 | 2147 | } |
d8626138 | 2148 | |
1da177e4 LT |
2149 | static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address) |
2150 | { | |
1bb3630e HD |
2151 | return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address))? |
2152 | NULL: pmd_offset(pud, address); | |
1da177e4 | 2153 | } |
f949286c | 2154 | #endif /* CONFIG_MMU */ |
1bb3630e | 2155 | |
57c1ffce | 2156 | #if USE_SPLIT_PTE_PTLOCKS |
597d795a | 2157 | #if ALLOC_SPLIT_PTLOCKS |
b35f1819 | 2158 | void __init ptlock_cache_init(void); |
539edb58 PZ |
2159 | extern bool ptlock_alloc(struct page *page); |
2160 | extern void ptlock_free(struct page *page); | |
2161 | ||
2162 | static inline spinlock_t *ptlock_ptr(struct page *page) | |
2163 | { | |
2164 | return page->ptl; | |
2165 | } | |
597d795a | 2166 | #else /* ALLOC_SPLIT_PTLOCKS */ |
b35f1819 KS |
2167 | static inline void ptlock_cache_init(void) |
2168 | { | |
2169 | } | |
2170 | ||
49076ec2 KS |
2171 | static inline bool ptlock_alloc(struct page *page) |
2172 | { | |
49076ec2 KS |
2173 | return true; |
2174 | } | |
539edb58 | 2175 | |
49076ec2 KS |
2176 | static inline void ptlock_free(struct page *page) |
2177 | { | |
49076ec2 KS |
2178 | } |
2179 | ||
2180 | static inline spinlock_t *ptlock_ptr(struct page *page) | |
2181 | { | |
539edb58 | 2182 | return &page->ptl; |
49076ec2 | 2183 | } |
597d795a | 2184 | #endif /* ALLOC_SPLIT_PTLOCKS */ |
49076ec2 KS |
2185 | |
2186 | static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd) | |
2187 | { | |
2188 | return ptlock_ptr(pmd_page(*pmd)); | |
2189 | } | |
2190 | ||
2191 | static inline bool ptlock_init(struct page *page) | |
2192 | { | |
2193 | /* | |
2194 | * prep_new_page() initialize page->private (and therefore page->ptl) | |
2195 | * with 0. Make sure nobody took it in use in between. | |
2196 | * | |
2197 | * It can happen if arch try to use slab for page table allocation: | |
1d798ca3 | 2198 | * slab code uses page->slab_cache, which share storage with page->ptl. |
49076ec2 | 2199 | */ |
309381fe | 2200 | VM_BUG_ON_PAGE(*(unsigned long *)&page->ptl, page); |
49076ec2 KS |
2201 | if (!ptlock_alloc(page)) |
2202 | return false; | |
2203 | spin_lock_init(ptlock_ptr(page)); | |
2204 | return true; | |
2205 | } | |
2206 | ||
57c1ffce | 2207 | #else /* !USE_SPLIT_PTE_PTLOCKS */ |
4c21e2f2 HD |
2208 | /* |
2209 | * We use mm->page_table_lock to guard all pagetable pages of the mm. | |
2210 | */ | |
49076ec2 KS |
2211 | static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd) |
2212 | { | |
2213 | return &mm->page_table_lock; | |
2214 | } | |
b35f1819 | 2215 | static inline void ptlock_cache_init(void) {} |
49076ec2 | 2216 | static inline bool ptlock_init(struct page *page) { return true; } |
9e247bab | 2217 | static inline void ptlock_free(struct page *page) {} |
57c1ffce | 2218 | #endif /* USE_SPLIT_PTE_PTLOCKS */ |
4c21e2f2 | 2219 | |
b35f1819 KS |
2220 | static inline void pgtable_init(void) |
2221 | { | |
2222 | ptlock_cache_init(); | |
2223 | pgtable_cache_init(); | |
2224 | } | |
2225 | ||
b4ed71f5 | 2226 | static inline bool pgtable_pte_page_ctor(struct page *page) |
2f569afd | 2227 | { |
706874e9 VD |
2228 | if (!ptlock_init(page)) |
2229 | return false; | |
1d40a5ea | 2230 | __SetPageTable(page); |
f0c0c115 | 2231 | inc_lruvec_page_state(page, NR_PAGETABLE); |
706874e9 | 2232 | return true; |
2f569afd MS |
2233 | } |
2234 | ||
b4ed71f5 | 2235 | static inline void pgtable_pte_page_dtor(struct page *page) |
2f569afd | 2236 | { |
9e247bab | 2237 | ptlock_free(page); |
1d40a5ea | 2238 | __ClearPageTable(page); |
f0c0c115 | 2239 | dec_lruvec_page_state(page, NR_PAGETABLE); |
2f569afd MS |
2240 | } |
2241 | ||
c74df32c HD |
2242 | #define pte_offset_map_lock(mm, pmd, address, ptlp) \ |
2243 | ({ \ | |
4c21e2f2 | 2244 | spinlock_t *__ptl = pte_lockptr(mm, pmd); \ |
c74df32c HD |
2245 | pte_t *__pte = pte_offset_map(pmd, address); \ |
2246 | *(ptlp) = __ptl; \ | |
2247 | spin_lock(__ptl); \ | |
2248 | __pte; \ | |
2249 | }) | |
2250 | ||
2251 | #define pte_unmap_unlock(pte, ptl) do { \ | |
2252 | spin_unlock(ptl); \ | |
2253 | pte_unmap(pte); \ | |
2254 | } while (0) | |
2255 | ||
4cf58924 | 2256 | #define pte_alloc(mm, pmd) (unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, pmd)) |
3ed3a4f0 KS |
2257 | |
2258 | #define pte_alloc_map(mm, pmd, address) \ | |
4cf58924 | 2259 | (pte_alloc(mm, pmd) ? NULL : pte_offset_map(pmd, address)) |
1bb3630e | 2260 | |
c74df32c | 2261 | #define pte_alloc_map_lock(mm, pmd, address, ptlp) \ |
4cf58924 | 2262 | (pte_alloc(mm, pmd) ? \ |
3ed3a4f0 | 2263 | NULL : pte_offset_map_lock(mm, pmd, address, ptlp)) |
c74df32c | 2264 | |
1bb3630e | 2265 | #define pte_alloc_kernel(pmd, address) \ |
4cf58924 | 2266 | ((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd))? \ |
1bb3630e | 2267 | NULL: pte_offset_kernel(pmd, address)) |
1da177e4 | 2268 | |
e009bb30 KS |
2269 | #if USE_SPLIT_PMD_PTLOCKS |
2270 | ||
634391ac MS |
2271 | static struct page *pmd_to_page(pmd_t *pmd) |
2272 | { | |
2273 | unsigned long mask = ~(PTRS_PER_PMD * sizeof(pmd_t) - 1); | |
2274 | return virt_to_page((void *)((unsigned long) pmd & mask)); | |
2275 | } | |
2276 | ||
e009bb30 KS |
2277 | static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd) |
2278 | { | |
634391ac | 2279 | return ptlock_ptr(pmd_to_page(pmd)); |
e009bb30 KS |
2280 | } |
2281 | ||
b2b29d6d | 2282 | static inline bool pmd_ptlock_init(struct page *page) |
e009bb30 | 2283 | { |
e009bb30 KS |
2284 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
2285 | page->pmd_huge_pte = NULL; | |
2286 | #endif | |
49076ec2 | 2287 | return ptlock_init(page); |
e009bb30 KS |
2288 | } |
2289 | ||
b2b29d6d | 2290 | static inline void pmd_ptlock_free(struct page *page) |
e009bb30 KS |
2291 | { |
2292 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
309381fe | 2293 | VM_BUG_ON_PAGE(page->pmd_huge_pte, page); |
e009bb30 | 2294 | #endif |
49076ec2 | 2295 | ptlock_free(page); |
e009bb30 KS |
2296 | } |
2297 | ||
634391ac | 2298 | #define pmd_huge_pte(mm, pmd) (pmd_to_page(pmd)->pmd_huge_pte) |
e009bb30 KS |
2299 | |
2300 | #else | |
2301 | ||
9a86cb7b KS |
2302 | static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd) |
2303 | { | |
2304 | return &mm->page_table_lock; | |
2305 | } | |
2306 | ||
b2b29d6d MW |
2307 | static inline bool pmd_ptlock_init(struct page *page) { return true; } |
2308 | static inline void pmd_ptlock_free(struct page *page) {} | |
e009bb30 | 2309 | |
c389a250 | 2310 | #define pmd_huge_pte(mm, pmd) ((mm)->pmd_huge_pte) |
9a86cb7b | 2311 | |
e009bb30 KS |
2312 | #endif |
2313 | ||
9a86cb7b KS |
2314 | static inline spinlock_t *pmd_lock(struct mm_struct *mm, pmd_t *pmd) |
2315 | { | |
2316 | spinlock_t *ptl = pmd_lockptr(mm, pmd); | |
2317 | spin_lock(ptl); | |
2318 | return ptl; | |
2319 | } | |
2320 | ||
b2b29d6d MW |
2321 | static inline bool pgtable_pmd_page_ctor(struct page *page) |
2322 | { | |
2323 | if (!pmd_ptlock_init(page)) | |
2324 | return false; | |
2325 | __SetPageTable(page); | |
f0c0c115 | 2326 | inc_lruvec_page_state(page, NR_PAGETABLE); |
b2b29d6d MW |
2327 | return true; |
2328 | } | |
2329 | ||
2330 | static inline void pgtable_pmd_page_dtor(struct page *page) | |
2331 | { | |
2332 | pmd_ptlock_free(page); | |
2333 | __ClearPageTable(page); | |
f0c0c115 | 2334 | dec_lruvec_page_state(page, NR_PAGETABLE); |
b2b29d6d MW |
2335 | } |
2336 | ||
a00cc7d9 MW |
2337 | /* |
2338 | * No scalability reason to split PUD locks yet, but follow the same pattern | |
2339 | * as the PMD locks to make it easier if we decide to. The VM should not be | |
2340 | * considered ready to switch to split PUD locks yet; there may be places | |
2341 | * which need to be converted from page_table_lock. | |
2342 | */ | |
2343 | static inline spinlock_t *pud_lockptr(struct mm_struct *mm, pud_t *pud) | |
2344 | { | |
2345 | return &mm->page_table_lock; | |
2346 | } | |
2347 | ||
2348 | static inline spinlock_t *pud_lock(struct mm_struct *mm, pud_t *pud) | |
2349 | { | |
2350 | spinlock_t *ptl = pud_lockptr(mm, pud); | |
2351 | ||
2352 | spin_lock(ptl); | |
2353 | return ptl; | |
2354 | } | |
62906027 | 2355 | |
a00cc7d9 | 2356 | extern void __init pagecache_init(void); |
bc9331a1 | 2357 | extern void __init free_area_init_memoryless_node(int nid); |
49a7f04a DH |
2358 | extern void free_initmem(void); |
2359 | ||
69afade7 JL |
2360 | /* |
2361 | * Free reserved pages within range [PAGE_ALIGN(start), end & PAGE_MASK) | |
2362 | * into the buddy system. The freed pages will be poisoned with pattern | |
dbe67df4 | 2363 | * "poison" if it's within range [0, UCHAR_MAX]. |
69afade7 JL |
2364 | * Return pages freed into the buddy system. |
2365 | */ | |
11199692 | 2366 | extern unsigned long free_reserved_area(void *start, void *end, |
e5cb113f | 2367 | int poison, const char *s); |
c3d5f5f0 | 2368 | |
c3d5f5f0 | 2369 | extern void adjust_managed_page_count(struct page *page, long count); |
1f9d03c5 | 2370 | extern void mem_init_print_info(void); |
69afade7 | 2371 | |
4b50bcc7 | 2372 | extern void reserve_bootmem_region(phys_addr_t start, phys_addr_t end); |
92923ca3 | 2373 | |
69afade7 | 2374 | /* Free the reserved page into the buddy system, so it gets managed. */ |
a0cd7a7c | 2375 | static inline void free_reserved_page(struct page *page) |
69afade7 JL |
2376 | { |
2377 | ClearPageReserved(page); | |
2378 | init_page_count(page); | |
2379 | __free_page(page); | |
69afade7 JL |
2380 | adjust_managed_page_count(page, 1); |
2381 | } | |
a0cd7a7c | 2382 | #define free_highmem_page(page) free_reserved_page(page) |
69afade7 JL |
2383 | |
2384 | static inline void mark_page_reserved(struct page *page) | |
2385 | { | |
2386 | SetPageReserved(page); | |
2387 | adjust_managed_page_count(page, -1); | |
2388 | } | |
2389 | ||
2390 | /* | |
2391 | * Default method to free all the __init memory into the buddy system. | |
dbe67df4 JL |
2392 | * The freed pages will be poisoned with pattern "poison" if it's within |
2393 | * range [0, UCHAR_MAX]. | |
2394 | * Return pages freed into the buddy system. | |
69afade7 JL |
2395 | */ |
2396 | static inline unsigned long free_initmem_default(int poison) | |
2397 | { | |
2398 | extern char __init_begin[], __init_end[]; | |
2399 | ||
11199692 | 2400 | return free_reserved_area(&__init_begin, &__init_end, |
c5a54c70 | 2401 | poison, "unused kernel image (initmem)"); |
69afade7 JL |
2402 | } |
2403 | ||
7ee3d4e8 JL |
2404 | static inline unsigned long get_num_physpages(void) |
2405 | { | |
2406 | int nid; | |
2407 | unsigned long phys_pages = 0; | |
2408 | ||
2409 | for_each_online_node(nid) | |
2410 | phys_pages += node_present_pages(nid); | |
2411 | ||
2412 | return phys_pages; | |
2413 | } | |
2414 | ||
c713216d | 2415 | /* |
3f08a302 | 2416 | * Using memblock node mappings, an architecture may initialise its |
bc9331a1 MR |
2417 | * zones, allocate the backing mem_map and account for memory holes in an |
2418 | * architecture independent manner. | |
c713216d MG |
2419 | * |
2420 | * An architecture is expected to register range of page frames backed by | |
0ee332c1 | 2421 | * physical memory with memblock_add[_node]() before calling |
9691a071 | 2422 | * free_area_init() passing in the PFN each zone ends at. At a basic |
c713216d MG |
2423 | * usage, an architecture is expected to do something like |
2424 | * | |
2425 | * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn, | |
2426 | * max_highmem_pfn}; | |
2427 | * for_each_valid_physical_page_range() | |
0ee332c1 | 2428 | * memblock_add_node(base, size, nid) |
9691a071 | 2429 | * free_area_init(max_zone_pfns); |
c713216d | 2430 | */ |
9691a071 | 2431 | void free_area_init(unsigned long *max_zone_pfn); |
1e01979c | 2432 | unsigned long node_map_pfn_alignment(void); |
32996250 YL |
2433 | unsigned long __absent_pages_in_range(int nid, unsigned long start_pfn, |
2434 | unsigned long end_pfn); | |
c713216d MG |
2435 | extern unsigned long absent_pages_in_range(unsigned long start_pfn, |
2436 | unsigned long end_pfn); | |
2437 | extern void get_pfn_range_for_nid(unsigned int nid, | |
2438 | unsigned long *start_pfn, unsigned long *end_pfn); | |
2439 | extern unsigned long find_min_pfn_with_active_regions(void); | |
f2dbcfa7 | 2440 | |
a9ee6cf5 | 2441 | #ifndef CONFIG_NUMA |
6f24fbd3 | 2442 | static inline int early_pfn_to_nid(unsigned long pfn) |
f2dbcfa7 KH |
2443 | { |
2444 | return 0; | |
2445 | } | |
2446 | #else | |
2447 | /* please see mm/page_alloc.c */ | |
2448 | extern int __meminit early_pfn_to_nid(unsigned long pfn); | |
f2dbcfa7 KH |
2449 | #endif |
2450 | ||
0e0b864e | 2451 | extern void set_dma_reserve(unsigned long new_dma_reserve); |
ab28cb6e | 2452 | extern void memmap_init_range(unsigned long, int, unsigned long, |
dc2da7b4 BH |
2453 | unsigned long, unsigned long, enum meminit_context, |
2454 | struct vmem_altmap *, int migratetype); | |
bc75d33f | 2455 | extern void setup_per_zone_wmarks(void); |
bd3400ea | 2456 | extern void calculate_min_free_kbytes(void); |
1b79acc9 | 2457 | extern int __meminit init_per_zone_wmark_min(void); |
1da177e4 | 2458 | extern void mem_init(void); |
8feae131 | 2459 | extern void __init mmap_init(void); |
9af744d7 | 2460 | extern void show_mem(unsigned int flags, nodemask_t *nodemask); |
d02bd27b | 2461 | extern long si_mem_available(void); |
1da177e4 LT |
2462 | extern void si_meminfo(struct sysinfo * val); |
2463 | extern void si_meminfo_node(struct sysinfo *val, int nid); | |
f6f34b43 SD |
2464 | #ifdef __HAVE_ARCH_RESERVED_KERNEL_PAGES |
2465 | extern unsigned long arch_reserved_kernel_pages(void); | |
2466 | #endif | |
1da177e4 | 2467 | |
a8e99259 MH |
2468 | extern __printf(3, 4) |
2469 | void warn_alloc(gfp_t gfp_mask, nodemask_t *nodemask, const char *fmt, ...); | |
a238ab5b | 2470 | |
e7c8d5c9 | 2471 | extern void setup_per_cpu_pageset(void); |
e7c8d5c9 | 2472 | |
75f7ad8e PS |
2473 | /* page_alloc.c */ |
2474 | extern int min_free_kbytes; | |
1c30844d | 2475 | extern int watermark_boost_factor; |
795ae7a0 | 2476 | extern int watermark_scale_factor; |
51930df5 | 2477 | extern bool arch_has_descending_max_zone_pfns(void); |
75f7ad8e | 2478 | |
8feae131 | 2479 | /* nommu.c */ |
33e5d769 | 2480 | extern atomic_long_t mmap_pages_allocated; |
7e660872 | 2481 | extern int nommu_shrink_inode_mappings(struct inode *, size_t, size_t); |
8feae131 | 2482 | |
6b2dbba8 | 2483 | /* interval_tree.c */ |
6b2dbba8 | 2484 | void vma_interval_tree_insert(struct vm_area_struct *node, |
f808c13f | 2485 | struct rb_root_cached *root); |
9826a516 ML |
2486 | void vma_interval_tree_insert_after(struct vm_area_struct *node, |
2487 | struct vm_area_struct *prev, | |
f808c13f | 2488 | struct rb_root_cached *root); |
6b2dbba8 | 2489 | void vma_interval_tree_remove(struct vm_area_struct *node, |
f808c13f DB |
2490 | struct rb_root_cached *root); |
2491 | struct vm_area_struct *vma_interval_tree_iter_first(struct rb_root_cached *root, | |
6b2dbba8 ML |
2492 | unsigned long start, unsigned long last); |
2493 | struct vm_area_struct *vma_interval_tree_iter_next(struct vm_area_struct *node, | |
2494 | unsigned long start, unsigned long last); | |
2495 | ||
2496 | #define vma_interval_tree_foreach(vma, root, start, last) \ | |
2497 | for (vma = vma_interval_tree_iter_first(root, start, last); \ | |
2498 | vma; vma = vma_interval_tree_iter_next(vma, start, last)) | |
1da177e4 | 2499 | |
bf181b9f | 2500 | void anon_vma_interval_tree_insert(struct anon_vma_chain *node, |
f808c13f | 2501 | struct rb_root_cached *root); |
bf181b9f | 2502 | void anon_vma_interval_tree_remove(struct anon_vma_chain *node, |
f808c13f DB |
2503 | struct rb_root_cached *root); |
2504 | struct anon_vma_chain * | |
2505 | anon_vma_interval_tree_iter_first(struct rb_root_cached *root, | |
2506 | unsigned long start, unsigned long last); | |
bf181b9f ML |
2507 | struct anon_vma_chain *anon_vma_interval_tree_iter_next( |
2508 | struct anon_vma_chain *node, unsigned long start, unsigned long last); | |
ed8ea815 ML |
2509 | #ifdef CONFIG_DEBUG_VM_RB |
2510 | void anon_vma_interval_tree_verify(struct anon_vma_chain *node); | |
2511 | #endif | |
bf181b9f ML |
2512 | |
2513 | #define anon_vma_interval_tree_foreach(avc, root, start, last) \ | |
2514 | for (avc = anon_vma_interval_tree_iter_first(root, start, last); \ | |
2515 | avc; avc = anon_vma_interval_tree_iter_next(avc, start, last)) | |
2516 | ||
1da177e4 | 2517 | /* mmap.c */ |
34b4e4aa | 2518 | extern int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin); |
e86f15ee AA |
2519 | extern int __vma_adjust(struct vm_area_struct *vma, unsigned long start, |
2520 | unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert, | |
2521 | struct vm_area_struct *expand); | |
2522 | static inline int vma_adjust(struct vm_area_struct *vma, unsigned long start, | |
2523 | unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert) | |
2524 | { | |
2525 | return __vma_adjust(vma, start, end, pgoff, insert, NULL); | |
2526 | } | |
1da177e4 LT |
2527 | extern struct vm_area_struct *vma_merge(struct mm_struct *, |
2528 | struct vm_area_struct *prev, unsigned long addr, unsigned long end, | |
2529 | unsigned long vm_flags, struct anon_vma *, struct file *, pgoff_t, | |
19a809af | 2530 | struct mempolicy *, struct vm_userfaultfd_ctx); |
1da177e4 | 2531 | extern struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *); |
def5efe0 DR |
2532 | extern int __split_vma(struct mm_struct *, struct vm_area_struct *, |
2533 | unsigned long addr, int new_below); | |
2534 | extern int split_vma(struct mm_struct *, struct vm_area_struct *, | |
2535 | unsigned long addr, int new_below); | |
1da177e4 LT |
2536 | extern int insert_vm_struct(struct mm_struct *, struct vm_area_struct *); |
2537 | extern void __vma_link_rb(struct mm_struct *, struct vm_area_struct *, | |
2538 | struct rb_node **, struct rb_node *); | |
a8fb5618 | 2539 | extern void unlink_file_vma(struct vm_area_struct *); |
1da177e4 | 2540 | extern struct vm_area_struct *copy_vma(struct vm_area_struct **, |
38a76013 ML |
2541 | unsigned long addr, unsigned long len, pgoff_t pgoff, |
2542 | bool *need_rmap_locks); | |
1da177e4 | 2543 | extern void exit_mmap(struct mm_struct *); |
925d1c40 | 2544 | |
9c599024 CG |
2545 | static inline int check_data_rlimit(unsigned long rlim, |
2546 | unsigned long new, | |
2547 | unsigned long start, | |
2548 | unsigned long end_data, | |
2549 | unsigned long start_data) | |
2550 | { | |
2551 | if (rlim < RLIM_INFINITY) { | |
2552 | if (((new - start) + (end_data - start_data)) > rlim) | |
2553 | return -ENOSPC; | |
2554 | } | |
2555 | ||
2556 | return 0; | |
2557 | } | |
2558 | ||
7906d00c AA |
2559 | extern int mm_take_all_locks(struct mm_struct *mm); |
2560 | extern void mm_drop_all_locks(struct mm_struct *mm); | |
2561 | ||
fe69d560 | 2562 | extern int set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file); |
35d7bdc8 | 2563 | extern int replace_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file); |
38646013 | 2564 | extern struct file *get_mm_exe_file(struct mm_struct *mm); |
cd81a917 | 2565 | extern struct file *get_task_exe_file(struct task_struct *task); |
925d1c40 | 2566 | |
84638335 KK |
2567 | extern bool may_expand_vm(struct mm_struct *, vm_flags_t, unsigned long npages); |
2568 | extern void vm_stat_account(struct mm_struct *, vm_flags_t, long npages); | |
2569 | ||
2eefd878 DS |
2570 | extern bool vma_is_special_mapping(const struct vm_area_struct *vma, |
2571 | const struct vm_special_mapping *sm); | |
3935ed6a SS |
2572 | extern struct vm_area_struct *_install_special_mapping(struct mm_struct *mm, |
2573 | unsigned long addr, unsigned long len, | |
a62c34bd AL |
2574 | unsigned long flags, |
2575 | const struct vm_special_mapping *spec); | |
2576 | /* This is an obsolete alternative to _install_special_mapping. */ | |
fa5dc22f RM |
2577 | extern int install_special_mapping(struct mm_struct *mm, |
2578 | unsigned long addr, unsigned long len, | |
2579 | unsigned long flags, struct page **pages); | |
1da177e4 | 2580 | |
649775be AG |
2581 | unsigned long randomize_stack_top(unsigned long stack_top); |
2582 | ||
1da177e4 LT |
2583 | extern unsigned long get_unmapped_area(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); |
2584 | ||
0165ab44 | 2585 | extern unsigned long mmap_region(struct file *file, unsigned long addr, |
897ab3e0 MR |
2586 | unsigned long len, vm_flags_t vm_flags, unsigned long pgoff, |
2587 | struct list_head *uf); | |
1fcfd8db | 2588 | extern unsigned long do_mmap(struct file *file, unsigned long addr, |
bebeb3d6 | 2589 | unsigned long len, unsigned long prot, unsigned long flags, |
45e55300 | 2590 | unsigned long pgoff, unsigned long *populate, struct list_head *uf); |
85a06835 YS |
2591 | extern int __do_munmap(struct mm_struct *, unsigned long, size_t, |
2592 | struct list_head *uf, bool downgrade); | |
897ab3e0 MR |
2593 | extern int do_munmap(struct mm_struct *, unsigned long, size_t, |
2594 | struct list_head *uf); | |
0726b01e | 2595 | extern int do_madvise(struct mm_struct *mm, unsigned long start, size_t len_in, int behavior); |
1da177e4 | 2596 | |
bebeb3d6 ML |
2597 | #ifdef CONFIG_MMU |
2598 | extern int __mm_populate(unsigned long addr, unsigned long len, | |
2599 | int ignore_errors); | |
2600 | static inline void mm_populate(unsigned long addr, unsigned long len) | |
2601 | { | |
2602 | /* Ignore errors */ | |
2603 | (void) __mm_populate(addr, len, 1); | |
2604 | } | |
2605 | #else | |
2606 | static inline void mm_populate(unsigned long addr, unsigned long len) {} | |
2607 | #endif | |
2608 | ||
e4eb1ff6 | 2609 | /* These take the mm semaphore themselves */ |
5d22fc25 | 2610 | extern int __must_check vm_brk(unsigned long, unsigned long); |
16e72e9b | 2611 | extern int __must_check vm_brk_flags(unsigned long, unsigned long, unsigned long); |
bfce281c | 2612 | extern int vm_munmap(unsigned long, size_t); |
9fbeb5ab | 2613 | extern unsigned long __must_check vm_mmap(struct file *, unsigned long, |
6be5ceb0 LT |
2614 | unsigned long, unsigned long, |
2615 | unsigned long, unsigned long); | |
1da177e4 | 2616 | |
db4fbfb9 ML |
2617 | struct vm_unmapped_area_info { |
2618 | #define VM_UNMAPPED_AREA_TOPDOWN 1 | |
2619 | unsigned long flags; | |
2620 | unsigned long length; | |
2621 | unsigned long low_limit; | |
2622 | unsigned long high_limit; | |
2623 | unsigned long align_mask; | |
2624 | unsigned long align_offset; | |
2625 | }; | |
2626 | ||
baceaf1c | 2627 | extern unsigned long vm_unmapped_area(struct vm_unmapped_area_info *info); |
db4fbfb9 | 2628 | |
85821aab | 2629 | /* truncate.c */ |
1da177e4 | 2630 | extern void truncate_inode_pages(struct address_space *, loff_t); |
d7339071 HR |
2631 | extern void truncate_inode_pages_range(struct address_space *, |
2632 | loff_t lstart, loff_t lend); | |
91b0abe3 | 2633 | extern void truncate_inode_pages_final(struct address_space *); |
1da177e4 LT |
2634 | |
2635 | /* generic vm_area_ops exported for stackable file systems */ | |
2bcd6454 | 2636 | extern vm_fault_t filemap_fault(struct vm_fault *vmf); |
f9ce0be7 | 2637 | extern vm_fault_t filemap_map_pages(struct vm_fault *vmf, |
bae473a4 | 2638 | pgoff_t start_pgoff, pgoff_t end_pgoff); |
2bcd6454 | 2639 | extern vm_fault_t filemap_page_mkwrite(struct vm_fault *vmf); |
1da177e4 LT |
2640 | |
2641 | /* mm/page-writeback.c */ | |
2b69c828 | 2642 | int __must_check write_one_page(struct page *page); |
1cf6e7d8 | 2643 | void task_dirty_inc(struct task_struct *tsk); |
1da177e4 | 2644 | |
1be7107f | 2645 | extern unsigned long stack_guard_gap; |
d05f3169 | 2646 | /* Generic expand stack which grows the stack according to GROWS{UP,DOWN} */ |
46dea3d0 | 2647 | extern int expand_stack(struct vm_area_struct *vma, unsigned long address); |
d05f3169 | 2648 | |
11192337 | 2649 | /* CONFIG_STACK_GROWSUP still needs to grow downwards at some places */ |
d05f3169 MH |
2650 | extern int expand_downwards(struct vm_area_struct *vma, |
2651 | unsigned long address); | |
8ca3eb08 | 2652 | #if VM_GROWSUP |
46dea3d0 | 2653 | extern int expand_upwards(struct vm_area_struct *vma, unsigned long address); |
8ca3eb08 | 2654 | #else |
fee7e49d | 2655 | #define expand_upwards(vma, address) (0) |
9ab88515 | 2656 | #endif |
1da177e4 LT |
2657 | |
2658 | /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */ | |
2659 | extern struct vm_area_struct * find_vma(struct mm_struct * mm, unsigned long addr); | |
2660 | extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned long addr, | |
2661 | struct vm_area_struct **pprev); | |
2662 | ||
ce6d42f2 LH |
2663 | /** |
2664 | * find_vma_intersection() - Look up the first VMA which intersects the interval | |
2665 | * @mm: The process address space. | |
2666 | * @start_addr: The inclusive start user address. | |
2667 | * @end_addr: The exclusive end user address. | |
2668 | * | |
2669 | * Returns: The first VMA within the provided range, %NULL otherwise. Assumes | |
2670 | * start_addr < end_addr. | |
2671 | */ | |
2672 | static inline | |
2673 | struct vm_area_struct *find_vma_intersection(struct mm_struct *mm, | |
2674 | unsigned long start_addr, | |
2675 | unsigned long end_addr) | |
1da177e4 | 2676 | { |
ce6d42f2 | 2677 | struct vm_area_struct *vma = find_vma(mm, start_addr); |
1da177e4 LT |
2678 | |
2679 | if (vma && end_addr <= vma->vm_start) | |
2680 | vma = NULL; | |
2681 | return vma; | |
2682 | } | |
2683 | ||
ce6d42f2 LH |
2684 | /** |
2685 | * vma_lookup() - Find a VMA at a specific address | |
2686 | * @mm: The process address space. | |
2687 | * @addr: The user address. | |
2688 | * | |
2689 | * Return: The vm_area_struct at the given address, %NULL otherwise. | |
2690 | */ | |
2691 | static inline | |
2692 | struct vm_area_struct *vma_lookup(struct mm_struct *mm, unsigned long addr) | |
2693 | { | |
2694 | struct vm_area_struct *vma = find_vma(mm, addr); | |
2695 | ||
2696 | if (vma && addr < vma->vm_start) | |
2697 | vma = NULL; | |
2698 | ||
2699 | return vma; | |
2700 | } | |
2701 | ||
1be7107f HD |
2702 | static inline unsigned long vm_start_gap(struct vm_area_struct *vma) |
2703 | { | |
2704 | unsigned long vm_start = vma->vm_start; | |
2705 | ||
2706 | if (vma->vm_flags & VM_GROWSDOWN) { | |
2707 | vm_start -= stack_guard_gap; | |
2708 | if (vm_start > vma->vm_start) | |
2709 | vm_start = 0; | |
2710 | } | |
2711 | return vm_start; | |
2712 | } | |
2713 | ||
2714 | static inline unsigned long vm_end_gap(struct vm_area_struct *vma) | |
2715 | { | |
2716 | unsigned long vm_end = vma->vm_end; | |
2717 | ||
2718 | if (vma->vm_flags & VM_GROWSUP) { | |
2719 | vm_end += stack_guard_gap; | |
2720 | if (vm_end < vma->vm_end) | |
2721 | vm_end = -PAGE_SIZE; | |
2722 | } | |
2723 | return vm_end; | |
2724 | } | |
2725 | ||
1da177e4 LT |
2726 | static inline unsigned long vma_pages(struct vm_area_struct *vma) |
2727 | { | |
2728 | return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; | |
2729 | } | |
2730 | ||
640708a2 PE |
2731 | /* Look up the first VMA which exactly match the interval vm_start ... vm_end */ |
2732 | static inline struct vm_area_struct *find_exact_vma(struct mm_struct *mm, | |
2733 | unsigned long vm_start, unsigned long vm_end) | |
2734 | { | |
2735 | struct vm_area_struct *vma = find_vma(mm, vm_start); | |
2736 | ||
2737 | if (vma && (vma->vm_start != vm_start || vma->vm_end != vm_end)) | |
2738 | vma = NULL; | |
2739 | ||
2740 | return vma; | |
2741 | } | |
2742 | ||
017b1660 MK |
2743 | static inline bool range_in_vma(struct vm_area_struct *vma, |
2744 | unsigned long start, unsigned long end) | |
2745 | { | |
2746 | return (vma && vma->vm_start <= start && end <= vma->vm_end); | |
2747 | } | |
2748 | ||
bad849b3 | 2749 | #ifdef CONFIG_MMU |
804af2cf | 2750 | pgprot_t vm_get_page_prot(unsigned long vm_flags); |
64e45507 | 2751 | void vma_set_page_prot(struct vm_area_struct *vma); |
bad849b3 DH |
2752 | #else |
2753 | static inline pgprot_t vm_get_page_prot(unsigned long vm_flags) | |
2754 | { | |
2755 | return __pgprot(0); | |
2756 | } | |
64e45507 PF |
2757 | static inline void vma_set_page_prot(struct vm_area_struct *vma) |
2758 | { | |
2759 | vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); | |
2760 | } | |
bad849b3 DH |
2761 | #endif |
2762 | ||
295992fb CK |
2763 | void vma_set_file(struct vm_area_struct *vma, struct file *file); |
2764 | ||
5877231f | 2765 | #ifdef CONFIG_NUMA_BALANCING |
4b10e7d5 | 2766 | unsigned long change_prot_numa(struct vm_area_struct *vma, |
b24f53a0 LS |
2767 | unsigned long start, unsigned long end); |
2768 | #endif | |
2769 | ||
deceb6cd | 2770 | struct vm_area_struct *find_extend_vma(struct mm_struct *, unsigned long addr); |
deceb6cd HD |
2771 | int remap_pfn_range(struct vm_area_struct *, unsigned long addr, |
2772 | unsigned long pfn, unsigned long size, pgprot_t); | |
74ffa5a3 CH |
2773 | int remap_pfn_range_notrack(struct vm_area_struct *vma, unsigned long addr, |
2774 | unsigned long pfn, unsigned long size, pgprot_t prot); | |
a145dd41 | 2775 | int vm_insert_page(struct vm_area_struct *, unsigned long addr, struct page *); |
8cd3984d AR |
2776 | int vm_insert_pages(struct vm_area_struct *vma, unsigned long addr, |
2777 | struct page **pages, unsigned long *num); | |
a667d745 SJ |
2778 | int vm_map_pages(struct vm_area_struct *vma, struct page **pages, |
2779 | unsigned long num); | |
2780 | int vm_map_pages_zero(struct vm_area_struct *vma, struct page **pages, | |
2781 | unsigned long num); | |
ae2b01f3 | 2782 | vm_fault_t vmf_insert_pfn(struct vm_area_struct *vma, unsigned long addr, |
e0dc0d8f | 2783 | unsigned long pfn); |
f5e6d1d5 MW |
2784 | vm_fault_t vmf_insert_pfn_prot(struct vm_area_struct *vma, unsigned long addr, |
2785 | unsigned long pfn, pgprot_t pgprot); | |
5d747637 | 2786 | vm_fault_t vmf_insert_mixed(struct vm_area_struct *vma, unsigned long addr, |
01c8f1c4 | 2787 | pfn_t pfn); |
574c5b3d TH |
2788 | vm_fault_t vmf_insert_mixed_prot(struct vm_area_struct *vma, unsigned long addr, |
2789 | pfn_t pfn, pgprot_t pgprot); | |
ab77dab4 SJ |
2790 | vm_fault_t vmf_insert_mixed_mkwrite(struct vm_area_struct *vma, |
2791 | unsigned long addr, pfn_t pfn); | |
b4cbb197 LT |
2792 | int vm_iomap_memory(struct vm_area_struct *vma, phys_addr_t start, unsigned long len); |
2793 | ||
1c8f4220 SJ |
2794 | static inline vm_fault_t vmf_insert_page(struct vm_area_struct *vma, |
2795 | unsigned long addr, struct page *page) | |
2796 | { | |
2797 | int err = vm_insert_page(vma, addr, page); | |
2798 | ||
2799 | if (err == -ENOMEM) | |
2800 | return VM_FAULT_OOM; | |
2801 | if (err < 0 && err != -EBUSY) | |
2802 | return VM_FAULT_SIGBUS; | |
2803 | ||
2804 | return VM_FAULT_NOPAGE; | |
2805 | } | |
2806 | ||
f8f6ae5d JG |
2807 | #ifndef io_remap_pfn_range |
2808 | static inline int io_remap_pfn_range(struct vm_area_struct *vma, | |
2809 | unsigned long addr, unsigned long pfn, | |
2810 | unsigned long size, pgprot_t prot) | |
2811 | { | |
2812 | return remap_pfn_range(vma, addr, pfn, size, pgprot_decrypted(prot)); | |
2813 | } | |
2814 | #endif | |
2815 | ||
d97baf94 SJ |
2816 | static inline vm_fault_t vmf_error(int err) |
2817 | { | |
2818 | if (err == -ENOMEM) | |
2819 | return VM_FAULT_OOM; | |
2820 | return VM_FAULT_SIGBUS; | |
2821 | } | |
2822 | ||
df06b37f KB |
2823 | struct page *follow_page(struct vm_area_struct *vma, unsigned long address, |
2824 | unsigned int foll_flags); | |
240aadee | 2825 | |
deceb6cd HD |
2826 | #define FOLL_WRITE 0x01 /* check pte is writable */ |
2827 | #define FOLL_TOUCH 0x02 /* mark page accessed */ | |
2828 | #define FOLL_GET 0x04 /* do get_page on page */ | |
8e4b9a60 | 2829 | #define FOLL_DUMP 0x08 /* give error on hole if it would be zero */ |
58fa879e | 2830 | #define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */ |
318b275f GN |
2831 | #define FOLL_NOWAIT 0x20 /* if a disk transfer is needed, start the IO |
2832 | * and return without waiting upon it */ | |
84d33df2 | 2833 | #define FOLL_POPULATE 0x40 /* fault in page */ |
69ebb83e | 2834 | #define FOLL_HWPOISON 0x100 /* check page is hwpoisoned */ |
0b9d7052 | 2835 | #define FOLL_NUMA 0x200 /* force NUMA hinting page fault */ |
5117b3b8 | 2836 | #define FOLL_MIGRATION 0x400 /* wait for page to replace migration entry */ |
234b239b | 2837 | #define FOLL_TRIED 0x800 /* a retry, previous pass started an IO */ |
de60f5f1 | 2838 | #define FOLL_MLOCK 0x1000 /* lock present pages */ |
1e987790 | 2839 | #define FOLL_REMOTE 0x2000 /* we are working on non-current tsk/mm */ |
19be0eaf | 2840 | #define FOLL_COW 0x4000 /* internal GUP flag */ |
7f7ccc2c | 2841 | #define FOLL_ANON 0x8000 /* don't do file mappings */ |
932f4a63 | 2842 | #define FOLL_LONGTERM 0x10000 /* mapping lifetime is indefinite: see below */ |
bfe7b00d | 2843 | #define FOLL_SPLIT_PMD 0x20000 /* split huge pmd before returning */ |
f1f6a7dd | 2844 | #define FOLL_PIN 0x40000 /* pages must be released via unpin_user_page */ |
376a34ef | 2845 | #define FOLL_FAST_ONLY 0x80000 /* gup_fast: prevent fall-back to slow gup */ |
932f4a63 IW |
2846 | |
2847 | /* | |
eddb1c22 JH |
2848 | * FOLL_PIN and FOLL_LONGTERM may be used in various combinations with each |
2849 | * other. Here is what they mean, and how to use them: | |
932f4a63 IW |
2850 | * |
2851 | * FOLL_LONGTERM indicates that the page will be held for an indefinite time | |
eddb1c22 JH |
2852 | * period _often_ under userspace control. This is in contrast to |
2853 | * iov_iter_get_pages(), whose usages are transient. | |
932f4a63 IW |
2854 | * |
2855 | * FIXME: For pages which are part of a filesystem, mappings are subject to the | |
2856 | * lifetime enforced by the filesystem and we need guarantees that longterm | |
2857 | * users like RDMA and V4L2 only establish mappings which coordinate usage with | |
2858 | * the filesystem. Ideas for this coordination include revoking the longterm | |
2859 | * pin, delaying writeback, bounce buffer page writeback, etc. As FS DAX was | |
2860 | * added after the problem with filesystems was found FS DAX VMAs are | |
2861 | * specifically failed. Filesystem pages are still subject to bugs and use of | |
2862 | * FOLL_LONGTERM should be avoided on those pages. | |
2863 | * | |
2864 | * FIXME: Also NOTE that FOLL_LONGTERM is not supported in every GUP call. | |
2865 | * Currently only get_user_pages() and get_user_pages_fast() support this flag | |
2866 | * and calls to get_user_pages_[un]locked are specifically not allowed. This | |
2867 | * is due to an incompatibility with the FS DAX check and | |
eddb1c22 | 2868 | * FAULT_FLAG_ALLOW_RETRY. |
932f4a63 | 2869 | * |
eddb1c22 JH |
2870 | * In the CMA case: long term pins in a CMA region would unnecessarily fragment |
2871 | * that region. And so, CMA attempts to migrate the page before pinning, when | |
932f4a63 | 2872 | * FOLL_LONGTERM is specified. |
eddb1c22 JH |
2873 | * |
2874 | * FOLL_PIN indicates that a special kind of tracking (not just page->_refcount, | |
2875 | * but an additional pin counting system) will be invoked. This is intended for | |
2876 | * anything that gets a page reference and then touches page data (for example, | |
2877 | * Direct IO). This lets the filesystem know that some non-file-system entity is | |
2878 | * potentially changing the pages' data. In contrast to FOLL_GET (whose pages | |
2879 | * are released via put_page()), FOLL_PIN pages must be released, ultimately, by | |
f1f6a7dd | 2880 | * a call to unpin_user_page(). |
eddb1c22 JH |
2881 | * |
2882 | * FOLL_PIN is similar to FOLL_GET: both of these pin pages. They use different | |
2883 | * and separate refcounting mechanisms, however, and that means that each has | |
2884 | * its own acquire and release mechanisms: | |
2885 | * | |
2886 | * FOLL_GET: get_user_pages*() to acquire, and put_page() to release. | |
2887 | * | |
f1f6a7dd | 2888 | * FOLL_PIN: pin_user_pages*() to acquire, and unpin_user_pages to release. |
eddb1c22 JH |
2889 | * |
2890 | * FOLL_PIN and FOLL_GET are mutually exclusive for a given function call. | |
2891 | * (The underlying pages may experience both FOLL_GET-based and FOLL_PIN-based | |
2892 | * calls applied to them, and that's perfectly OK. This is a constraint on the | |
2893 | * callers, not on the pages.) | |
2894 | * | |
2895 | * FOLL_PIN should be set internally by the pin_user_pages*() APIs, never | |
2896 | * directly by the caller. That's in order to help avoid mismatches when | |
2897 | * releasing pages: get_user_pages*() pages must be released via put_page(), | |
f1f6a7dd | 2898 | * while pin_user_pages*() pages must be released via unpin_user_page(). |
eddb1c22 | 2899 | * |
72ef5e52 | 2900 | * Please see Documentation/core-api/pin_user_pages.rst for more information. |
932f4a63 | 2901 | */ |
1da177e4 | 2902 | |
2b740303 | 2903 | static inline int vm_fault_to_errno(vm_fault_t vm_fault, int foll_flags) |
9a291a7c JM |
2904 | { |
2905 | if (vm_fault & VM_FAULT_OOM) | |
2906 | return -ENOMEM; | |
2907 | if (vm_fault & (VM_FAULT_HWPOISON | VM_FAULT_HWPOISON_LARGE)) | |
2908 | return (foll_flags & FOLL_HWPOISON) ? -EHWPOISON : -EFAULT; | |
2909 | if (vm_fault & (VM_FAULT_SIGBUS | VM_FAULT_SIGSEGV)) | |
2910 | return -EFAULT; | |
2911 | return 0; | |
2912 | } | |
2913 | ||
8b1e0f81 | 2914 | typedef int (*pte_fn_t)(pte_t *pte, unsigned long addr, void *data); |
aee16b3c JF |
2915 | extern int apply_to_page_range(struct mm_struct *mm, unsigned long address, |
2916 | unsigned long size, pte_fn_t fn, void *data); | |
be1db475 DA |
2917 | extern int apply_to_existing_page_range(struct mm_struct *mm, |
2918 | unsigned long address, unsigned long size, | |
2919 | pte_fn_t fn, void *data); | |
aee16b3c | 2920 | |
04013513 | 2921 | extern void init_mem_debugging_and_hardening(void); |
8823b1db | 2922 | #ifdef CONFIG_PAGE_POISONING |
8db26a3d VB |
2923 | extern void __kernel_poison_pages(struct page *page, int numpages); |
2924 | extern void __kernel_unpoison_pages(struct page *page, int numpages); | |
2925 | extern bool _page_poisoning_enabled_early; | |
2926 | DECLARE_STATIC_KEY_FALSE(_page_poisoning_enabled); | |
2927 | static inline bool page_poisoning_enabled(void) | |
2928 | { | |
2929 | return _page_poisoning_enabled_early; | |
2930 | } | |
2931 | /* | |
2932 | * For use in fast paths after init_mem_debugging() has run, or when a | |
2933 | * false negative result is not harmful when called too early. | |
2934 | */ | |
2935 | static inline bool page_poisoning_enabled_static(void) | |
2936 | { | |
2937 | return static_branch_unlikely(&_page_poisoning_enabled); | |
2938 | } | |
2939 | static inline void kernel_poison_pages(struct page *page, int numpages) | |
2940 | { | |
2941 | if (page_poisoning_enabled_static()) | |
2942 | __kernel_poison_pages(page, numpages); | |
2943 | } | |
2944 | static inline void kernel_unpoison_pages(struct page *page, int numpages) | |
2945 | { | |
2946 | if (page_poisoning_enabled_static()) | |
2947 | __kernel_unpoison_pages(page, numpages); | |
2948 | } | |
8823b1db LA |
2949 | #else |
2950 | static inline bool page_poisoning_enabled(void) { return false; } | |
8db26a3d | 2951 | static inline bool page_poisoning_enabled_static(void) { return false; } |
03b6c9a3 | 2952 | static inline void __kernel_poison_pages(struct page *page, int nunmpages) { } |
8db26a3d VB |
2953 | static inline void kernel_poison_pages(struct page *page, int numpages) { } |
2954 | static inline void kernel_unpoison_pages(struct page *page, int numpages) { } | |
8823b1db LA |
2955 | #endif |
2956 | ||
51cba1eb | 2957 | DECLARE_STATIC_KEY_MAYBE(CONFIG_INIT_ON_ALLOC_DEFAULT_ON, init_on_alloc); |
6471384a AP |
2958 | static inline bool want_init_on_alloc(gfp_t flags) |
2959 | { | |
51cba1eb KC |
2960 | if (static_branch_maybe(CONFIG_INIT_ON_ALLOC_DEFAULT_ON, |
2961 | &init_on_alloc)) | |
6471384a AP |
2962 | return true; |
2963 | return flags & __GFP_ZERO; | |
2964 | } | |
2965 | ||
51cba1eb | 2966 | DECLARE_STATIC_KEY_MAYBE(CONFIG_INIT_ON_FREE_DEFAULT_ON, init_on_free); |
6471384a AP |
2967 | static inline bool want_init_on_free(void) |
2968 | { | |
51cba1eb KC |
2969 | return static_branch_maybe(CONFIG_INIT_ON_FREE_DEFAULT_ON, |
2970 | &init_on_free); | |
6471384a AP |
2971 | } |
2972 | ||
8e57f8ac VB |
2973 | extern bool _debug_pagealloc_enabled_early; |
2974 | DECLARE_STATIC_KEY_FALSE(_debug_pagealloc_enabled); | |
031bc574 JK |
2975 | |
2976 | static inline bool debug_pagealloc_enabled(void) | |
8e57f8ac VB |
2977 | { |
2978 | return IS_ENABLED(CONFIG_DEBUG_PAGEALLOC) && | |
2979 | _debug_pagealloc_enabled_early; | |
2980 | } | |
2981 | ||
2982 | /* | |
2983 | * For use in fast paths after init_debug_pagealloc() has run, or when a | |
2984 | * false negative result is not harmful when called too early. | |
2985 | */ | |
2986 | static inline bool debug_pagealloc_enabled_static(void) | |
031bc574 | 2987 | { |
96a2b03f VB |
2988 | if (!IS_ENABLED(CONFIG_DEBUG_PAGEALLOC)) |
2989 | return false; | |
2990 | ||
2991 | return static_branch_unlikely(&_debug_pagealloc_enabled); | |
031bc574 JK |
2992 | } |
2993 | ||
5d6ad668 | 2994 | #ifdef CONFIG_DEBUG_PAGEALLOC |
c87cbc1f | 2995 | /* |
5d6ad668 MR |
2996 | * To support DEBUG_PAGEALLOC architecture must ensure that |
2997 | * __kernel_map_pages() never fails | |
c87cbc1f | 2998 | */ |
d6332692 RE |
2999 | extern void __kernel_map_pages(struct page *page, int numpages, int enable); |
3000 | ||
77bc7fd6 MR |
3001 | static inline void debug_pagealloc_map_pages(struct page *page, int numpages) |
3002 | { | |
3003 | if (debug_pagealloc_enabled_static()) | |
3004 | __kernel_map_pages(page, numpages, 1); | |
3005 | } | |
3006 | ||
3007 | static inline void debug_pagealloc_unmap_pages(struct page *page, int numpages) | |
3008 | { | |
3009 | if (debug_pagealloc_enabled_static()) | |
3010 | __kernel_map_pages(page, numpages, 0); | |
3011 | } | |
5d6ad668 | 3012 | #else /* CONFIG_DEBUG_PAGEALLOC */ |
77bc7fd6 MR |
3013 | static inline void debug_pagealloc_map_pages(struct page *page, int numpages) {} |
3014 | static inline void debug_pagealloc_unmap_pages(struct page *page, int numpages) {} | |
5d6ad668 | 3015 | #endif /* CONFIG_DEBUG_PAGEALLOC */ |
1da177e4 | 3016 | |
a6c19dfe | 3017 | #ifdef __HAVE_ARCH_GATE_AREA |
31db58b3 | 3018 | extern struct vm_area_struct *get_gate_vma(struct mm_struct *mm); |
a6c19dfe AL |
3019 | extern int in_gate_area_no_mm(unsigned long addr); |
3020 | extern int in_gate_area(struct mm_struct *mm, unsigned long addr); | |
1da177e4 | 3021 | #else |
a6c19dfe AL |
3022 | static inline struct vm_area_struct *get_gate_vma(struct mm_struct *mm) |
3023 | { | |
3024 | return NULL; | |
3025 | } | |
3026 | static inline int in_gate_area_no_mm(unsigned long addr) { return 0; } | |
3027 | static inline int in_gate_area(struct mm_struct *mm, unsigned long addr) | |
3028 | { | |
3029 | return 0; | |
3030 | } | |
1da177e4 LT |
3031 | #endif /* __HAVE_ARCH_GATE_AREA */ |
3032 | ||
44a70ade MH |
3033 | extern bool process_shares_mm(struct task_struct *p, struct mm_struct *mm); |
3034 | ||
146732ce JT |
3035 | #ifdef CONFIG_SYSCTL |
3036 | extern int sysctl_drop_caches; | |
32927393 CH |
3037 | int drop_caches_sysctl_handler(struct ctl_table *, int, void *, size_t *, |
3038 | loff_t *); | |
146732ce JT |
3039 | #endif |
3040 | ||
cb731d6c VD |
3041 | void drop_slab(void); |
3042 | void drop_slab_node(int nid); | |
9d0243bc | 3043 | |
7a9166e3 LY |
3044 | #ifndef CONFIG_MMU |
3045 | #define randomize_va_space 0 | |
3046 | #else | |
a62eaf15 | 3047 | extern int randomize_va_space; |
7a9166e3 | 3048 | #endif |
a62eaf15 | 3049 | |
045e72ac | 3050 | const char * arch_vma_name(struct vm_area_struct *vma); |
89165b8b | 3051 | #ifdef CONFIG_MMU |
03252919 | 3052 | void print_vma_addr(char *prefix, unsigned long rip); |
89165b8b CH |
3053 | #else |
3054 | static inline void print_vma_addr(char *prefix, unsigned long rip) | |
3055 | { | |
3056 | } | |
3057 | #endif | |
e6e5494c | 3058 | |
3bc2b6a7 MS |
3059 | int vmemmap_remap_free(unsigned long start, unsigned long end, |
3060 | unsigned long reuse); | |
ad2fa371 MS |
3061 | int vmemmap_remap_alloc(unsigned long start, unsigned long end, |
3062 | unsigned long reuse, gfp_t gfp_mask); | |
f41f2ed4 | 3063 | |
35fd1eb1 | 3064 | void *sparse_buffer_alloc(unsigned long size); |
e9c0a3f0 DW |
3065 | struct page * __populate_section_memmap(unsigned long pfn, |
3066 | unsigned long nr_pages, int nid, struct vmem_altmap *altmap); | |
29c71111 | 3067 | pgd_t *vmemmap_pgd_populate(unsigned long addr, int node); |
c2febafc KS |
3068 | p4d_t *vmemmap_p4d_populate(pgd_t *pgd, unsigned long addr, int node); |
3069 | pud_t *vmemmap_pud_populate(p4d_t *p4d, unsigned long addr, int node); | |
29c71111 | 3070 | pmd_t *vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node); |
1d9cfee7 AK |
3071 | pte_t *vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node, |
3072 | struct vmem_altmap *altmap); | |
8f6aac41 | 3073 | void *vmemmap_alloc_block(unsigned long size, int node); |
4b94ffdc | 3074 | struct vmem_altmap; |
56993b4e AK |
3075 | void *vmemmap_alloc_block_buf(unsigned long size, int node, |
3076 | struct vmem_altmap *altmap); | |
8f6aac41 | 3077 | void vmemmap_verify(pte_t *, int, unsigned long, unsigned long); |
0aad818b | 3078 | int vmemmap_populate_basepages(unsigned long start, unsigned long end, |
1d9cfee7 | 3079 | int node, struct vmem_altmap *altmap); |
7b73d978 CH |
3080 | int vmemmap_populate(unsigned long start, unsigned long end, int node, |
3081 | struct vmem_altmap *altmap); | |
c2b91e2e | 3082 | void vmemmap_populate_print_last(void); |
0197518c | 3083 | #ifdef CONFIG_MEMORY_HOTPLUG |
24b6d416 CH |
3084 | void vmemmap_free(unsigned long start, unsigned long end, |
3085 | struct vmem_altmap *altmap); | |
0197518c | 3086 | #endif |
46723bfa | 3087 | void register_page_bootmem_memmap(unsigned long section_nr, struct page *map, |
15670bfe | 3088 | unsigned long nr_pages); |
6a46079c | 3089 | |
82ba011b AK |
3090 | enum mf_flags { |
3091 | MF_COUNT_INCREASED = 1 << 0, | |
7329bbeb | 3092 | MF_ACTION_REQUIRED = 1 << 1, |
6751ed65 | 3093 | MF_MUST_KILL = 1 << 2, |
cf870c70 | 3094 | MF_SOFT_OFFLINE = 1 << 3, |
82ba011b | 3095 | }; |
83b57531 EB |
3096 | extern int memory_failure(unsigned long pfn, int flags); |
3097 | extern void memory_failure_queue(unsigned long pfn, int flags); | |
06202231 | 3098 | extern void memory_failure_queue_kick(int cpu); |
847ce401 | 3099 | extern int unpoison_memory(unsigned long pfn); |
6a46079c AK |
3100 | extern int sysctl_memory_failure_early_kill; |
3101 | extern int sysctl_memory_failure_recovery; | |
d0505e9f | 3102 | extern void shake_page(struct page *p); |
5844a486 | 3103 | extern atomic_long_t num_poisoned_pages __read_mostly; |
feec24a6 | 3104 | extern int soft_offline_page(unsigned long pfn, int flags); |
6a46079c | 3105 | |
cc637b17 XX |
3106 | |
3107 | /* | |
3108 | * Error handlers for various types of pages. | |
3109 | */ | |
cc3e2af4 | 3110 | enum mf_result { |
cc637b17 XX |
3111 | MF_IGNORED, /* Error: cannot be handled */ |
3112 | MF_FAILED, /* Error: handling failed */ | |
3113 | MF_DELAYED, /* Will be handled later */ | |
3114 | MF_RECOVERED, /* Successfully recovered */ | |
3115 | }; | |
3116 | ||
3117 | enum mf_action_page_type { | |
3118 | MF_MSG_KERNEL, | |
3119 | MF_MSG_KERNEL_HIGH_ORDER, | |
3120 | MF_MSG_SLAB, | |
3121 | MF_MSG_DIFFERENT_COMPOUND, | |
3122 | MF_MSG_POISONED_HUGE, | |
3123 | MF_MSG_HUGE, | |
3124 | MF_MSG_FREE_HUGE, | |
31286a84 | 3125 | MF_MSG_NON_PMD_HUGE, |
cc637b17 XX |
3126 | MF_MSG_UNMAP_FAILED, |
3127 | MF_MSG_DIRTY_SWAPCACHE, | |
3128 | MF_MSG_CLEAN_SWAPCACHE, | |
3129 | MF_MSG_DIRTY_MLOCKED_LRU, | |
3130 | MF_MSG_CLEAN_MLOCKED_LRU, | |
3131 | MF_MSG_DIRTY_UNEVICTABLE_LRU, | |
3132 | MF_MSG_CLEAN_UNEVICTABLE_LRU, | |
3133 | MF_MSG_DIRTY_LRU, | |
3134 | MF_MSG_CLEAN_LRU, | |
3135 | MF_MSG_TRUNCATED_LRU, | |
3136 | MF_MSG_BUDDY, | |
3137 | MF_MSG_BUDDY_2ND, | |
6100e34b | 3138 | MF_MSG_DAX, |
5d1fd5dc | 3139 | MF_MSG_UNSPLIT_THP, |
cc637b17 XX |
3140 | MF_MSG_UNKNOWN, |
3141 | }; | |
3142 | ||
47ad8475 AA |
3143 | #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS) |
3144 | extern void clear_huge_page(struct page *page, | |
c79b57e4 | 3145 | unsigned long addr_hint, |
47ad8475 AA |
3146 | unsigned int pages_per_huge_page); |
3147 | extern void copy_user_huge_page(struct page *dst, struct page *src, | |
c9f4cd71 HY |
3148 | unsigned long addr_hint, |
3149 | struct vm_area_struct *vma, | |
47ad8475 | 3150 | unsigned int pages_per_huge_page); |
fa4d75c1 MK |
3151 | extern long copy_huge_page_from_user(struct page *dst_page, |
3152 | const void __user *usr_src, | |
810a56b9 MK |
3153 | unsigned int pages_per_huge_page, |
3154 | bool allow_pagefault); | |
2484ca9b THV |
3155 | |
3156 | /** | |
3157 | * vma_is_special_huge - Are transhuge page-table entries considered special? | |
3158 | * @vma: Pointer to the struct vm_area_struct to consider | |
3159 | * | |
3160 | * Whether transhuge page-table entries are considered "special" following | |
3161 | * the definition in vm_normal_page(). | |
3162 | * | |
3163 | * Return: true if transhuge page-table entries should be considered special, | |
3164 | * false otherwise. | |
3165 | */ | |
3166 | static inline bool vma_is_special_huge(const struct vm_area_struct *vma) | |
3167 | { | |
3168 | return vma_is_dax(vma) || (vma->vm_file && | |
3169 | (vma->vm_flags & (VM_PFNMAP | VM_MIXEDMAP))); | |
3170 | } | |
3171 | ||
47ad8475 AA |
3172 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */ |
3173 | ||
c0a32fc5 SG |
3174 | #ifdef CONFIG_DEBUG_PAGEALLOC |
3175 | extern unsigned int _debug_guardpage_minorder; | |
96a2b03f | 3176 | DECLARE_STATIC_KEY_FALSE(_debug_guardpage_enabled); |
c0a32fc5 SG |
3177 | |
3178 | static inline unsigned int debug_guardpage_minorder(void) | |
3179 | { | |
3180 | return _debug_guardpage_minorder; | |
3181 | } | |
3182 | ||
e30825f1 JK |
3183 | static inline bool debug_guardpage_enabled(void) |
3184 | { | |
96a2b03f | 3185 | return static_branch_unlikely(&_debug_guardpage_enabled); |
e30825f1 JK |
3186 | } |
3187 | ||
c0a32fc5 SG |
3188 | static inline bool page_is_guard(struct page *page) |
3189 | { | |
e30825f1 JK |
3190 | if (!debug_guardpage_enabled()) |
3191 | return false; | |
3192 | ||
3972f6bb | 3193 | return PageGuard(page); |
c0a32fc5 SG |
3194 | } |
3195 | #else | |
3196 | static inline unsigned int debug_guardpage_minorder(void) { return 0; } | |
e30825f1 | 3197 | static inline bool debug_guardpage_enabled(void) { return false; } |
c0a32fc5 SG |
3198 | static inline bool page_is_guard(struct page *page) { return false; } |
3199 | #endif /* CONFIG_DEBUG_PAGEALLOC */ | |
3200 | ||
f9872caf CS |
3201 | #if MAX_NUMNODES > 1 |
3202 | void __init setup_nr_node_ids(void); | |
3203 | #else | |
3204 | static inline void setup_nr_node_ids(void) {} | |
3205 | #endif | |
3206 | ||
010c164a SL |
3207 | extern int memcmp_pages(struct page *page1, struct page *page2); |
3208 | ||
3209 | static inline int pages_identical(struct page *page1, struct page *page2) | |
3210 | { | |
3211 | return !memcmp_pages(page1, page2); | |
3212 | } | |
3213 | ||
c5acad84 TH |
3214 | #ifdef CONFIG_MAPPING_DIRTY_HELPERS |
3215 | unsigned long clean_record_shared_mapping_range(struct address_space *mapping, | |
3216 | pgoff_t first_index, pgoff_t nr, | |
3217 | pgoff_t bitmap_pgoff, | |
3218 | unsigned long *bitmap, | |
3219 | pgoff_t *start, | |
3220 | pgoff_t *end); | |
3221 | ||
3222 | unsigned long wp_shared_mapping_range(struct address_space *mapping, | |
3223 | pgoff_t first_index, pgoff_t nr); | |
3224 | #endif | |
3225 | ||
2374c09b CH |
3226 | extern int sysctl_nr_trim_pages; |
3227 | ||
5bb1bb35 | 3228 | #ifdef CONFIG_PRINTK |
8e7f37f2 | 3229 | void mem_dump_obj(void *object); |
5bb1bb35 PM |
3230 | #else |
3231 | static inline void mem_dump_obj(void *object) {} | |
3232 | #endif | |
8e7f37f2 | 3233 | |
22247efd PX |
3234 | /** |
3235 | * seal_check_future_write - Check for F_SEAL_FUTURE_WRITE flag and handle it | |
3236 | * @seals: the seals to check | |
3237 | * @vma: the vma to operate on | |
3238 | * | |
3239 | * Check whether F_SEAL_FUTURE_WRITE is set; if so, do proper check/handling on | |
3240 | * the vma flags. Return 0 if check pass, or <0 for errors. | |
3241 | */ | |
3242 | static inline int seal_check_future_write(int seals, struct vm_area_struct *vma) | |
3243 | { | |
3244 | if (seals & F_SEAL_FUTURE_WRITE) { | |
3245 | /* | |
3246 | * New PROT_WRITE and MAP_SHARED mmaps are not allowed when | |
3247 | * "future write" seal active. | |
3248 | */ | |
3249 | if ((vma->vm_flags & VM_SHARED) && (vma->vm_flags & VM_WRITE)) | |
3250 | return -EPERM; | |
3251 | ||
3252 | /* | |
3253 | * Since an F_SEAL_FUTURE_WRITE sealed memfd can be mapped as | |
3254 | * MAP_SHARED and read-only, take care to not allow mprotect to | |
3255 | * revert protections on such mappings. Do this only for shared | |
3256 | * mappings. For private mappings, don't need to mask | |
3257 | * VM_MAYWRITE as we still want them to be COW-writable. | |
3258 | */ | |
3259 | if (vma->vm_flags & VM_SHARED) | |
3260 | vma->vm_flags &= ~(VM_MAYWRITE); | |
3261 | } | |
3262 | ||
3263 | return 0; | |
3264 | } | |
3265 | ||
1da177e4 LT |
3266 | #endif /* __KERNEL__ */ |
3267 | #endif /* _LINUX_MM_H */ |