Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 | 2 | /* |
2e892f43 CL |
3 | * Written by Mark Hemment, 1996 (markhe@nextd.demon.co.uk). |
4 | * | |
cde53535 | 5 | * (C) SGI 2006, Christoph Lameter |
2e892f43 CL |
6 | * Cleaned up and restructured to ease the addition of alternative |
7 | * implementations of SLAB allocators. | |
f1b6eb6e CL |
8 | * (C) Linux Foundation 2008-2013 |
9 | * Unified interface for all slab allocators | |
1da177e4 LT |
10 | */ |
11 | ||
12 | #ifndef _LINUX_SLAB_H | |
13 | #define _LINUX_SLAB_H | |
14 | ||
1b1cec4b | 15 | #include <linux/gfp.h> |
1b1cec4b | 16 | #include <linux/types.h> |
1f458cbf GC |
17 | #include <linux/workqueue.h> |
18 | ||
1da177e4 | 19 | |
2e892f43 CL |
20 | /* |
21 | * Flags to pass to kmem_cache_create(). | |
124dee09 | 22 | * The ones marked DEBUG are only valid if CONFIG_DEBUG_SLAB is set. |
1da177e4 | 23 | */ |
d50112ed | 24 | /* DEBUG: Perform (expensive) checks on alloc/free */ |
4fd0b46e | 25 | #define SLAB_CONSISTENCY_CHECKS ((slab_flags_t __force)0x00000100U) |
d50112ed | 26 | /* DEBUG: Red zone objs in a cache */ |
4fd0b46e | 27 | #define SLAB_RED_ZONE ((slab_flags_t __force)0x00000400U) |
d50112ed | 28 | /* DEBUG: Poison objects */ |
4fd0b46e | 29 | #define SLAB_POISON ((slab_flags_t __force)0x00000800U) |
d50112ed | 30 | /* Align objs on cache lines */ |
4fd0b46e | 31 | #define SLAB_HWCACHE_ALIGN ((slab_flags_t __force)0x00002000U) |
d50112ed | 32 | /* Use GFP_DMA memory */ |
4fd0b46e | 33 | #define SLAB_CACHE_DMA ((slab_flags_t __force)0x00004000U) |
d50112ed | 34 | /* DEBUG: Store the last owner for bug hunting */ |
4fd0b46e | 35 | #define SLAB_STORE_USER ((slab_flags_t __force)0x00010000U) |
d50112ed | 36 | /* Panic if kmem_cache_create() fails */ |
4fd0b46e | 37 | #define SLAB_PANIC ((slab_flags_t __force)0x00040000U) |
d7de4c1d | 38 | /* |
5f0d5a3a | 39 | * SLAB_TYPESAFE_BY_RCU - **WARNING** READ THIS! |
d7de4c1d PZ |
40 | * |
41 | * This delays freeing the SLAB page by a grace period, it does _NOT_ | |
42 | * delay object freeing. This means that if you do kmem_cache_free() | |
43 | * that memory location is free to be reused at any time. Thus it may | |
44 | * be possible to see another object there in the same RCU grace period. | |
45 | * | |
46 | * This feature only ensures the memory location backing the object | |
47 | * stays valid, the trick to using this is relying on an independent | |
48 | * object validation pass. Something like: | |
49 | * | |
50 | * rcu_read_lock() | |
51 | * again: | |
52 | * obj = lockless_lookup(key); | |
53 | * if (obj) { | |
54 | * if (!try_get_ref(obj)) // might fail for free objects | |
55 | * goto again; | |
56 | * | |
57 | * if (obj->key != key) { // not the object we expected | |
58 | * put_ref(obj); | |
59 | * goto again; | |
60 | * } | |
61 | * } | |
62 | * rcu_read_unlock(); | |
63 | * | |
68126702 JK |
64 | * This is useful if we need to approach a kernel structure obliquely, |
65 | * from its address obtained without the usual locking. We can lock | |
66 | * the structure to stabilize it and check it's still at the given address, | |
67 | * only if we can be sure that the memory has not been meanwhile reused | |
68 | * for some other kind of object (which our subsystem's lock might corrupt). | |
69 | * | |
70 | * rcu_read_lock before reading the address, then rcu_read_unlock after | |
71 | * taking the spinlock within the structure expected at that address. | |
5f0d5a3a PM |
72 | * |
73 | * Note that SLAB_TYPESAFE_BY_RCU was originally named SLAB_DESTROY_BY_RCU. | |
d7de4c1d | 74 | */ |
d50112ed | 75 | /* Defer freeing slabs to RCU */ |
4fd0b46e | 76 | #define SLAB_TYPESAFE_BY_RCU ((slab_flags_t __force)0x00080000U) |
d50112ed | 77 | /* Spread some memory over cpuset */ |
4fd0b46e | 78 | #define SLAB_MEM_SPREAD ((slab_flags_t __force)0x00100000U) |
d50112ed | 79 | /* Trace allocations and frees */ |
4fd0b46e | 80 | #define SLAB_TRACE ((slab_flags_t __force)0x00200000U) |
1da177e4 | 81 | |
30327acf TG |
82 | /* Flag to prevent checks on free */ |
83 | #ifdef CONFIG_DEBUG_OBJECTS | |
4fd0b46e | 84 | # define SLAB_DEBUG_OBJECTS ((slab_flags_t __force)0x00400000U) |
30327acf | 85 | #else |
4fd0b46e | 86 | # define SLAB_DEBUG_OBJECTS 0 |
30327acf TG |
87 | #endif |
88 | ||
d50112ed | 89 | /* Avoid kmemleak tracing */ |
4fd0b46e | 90 | #define SLAB_NOLEAKTRACE ((slab_flags_t __force)0x00800000U) |
d5cff635 | 91 | |
d50112ed | 92 | /* Fault injection mark */ |
4c13dd3b | 93 | #ifdef CONFIG_FAILSLAB |
4fd0b46e | 94 | # define SLAB_FAILSLAB ((slab_flags_t __force)0x02000000U) |
4c13dd3b | 95 | #else |
4fd0b46e | 96 | # define SLAB_FAILSLAB 0 |
4c13dd3b | 97 | #endif |
d50112ed | 98 | /* Account to memcg */ |
127424c8 | 99 | #if defined(CONFIG_MEMCG) && !defined(CONFIG_SLOB) |
4fd0b46e | 100 | # define SLAB_ACCOUNT ((slab_flags_t __force)0x04000000U) |
230e9fc2 | 101 | #else |
4fd0b46e | 102 | # define SLAB_ACCOUNT 0 |
230e9fc2 | 103 | #endif |
2dff4405 | 104 | |
7ed2f9e6 | 105 | #ifdef CONFIG_KASAN |
4fd0b46e | 106 | #define SLAB_KASAN ((slab_flags_t __force)0x08000000U) |
7ed2f9e6 | 107 | #else |
4fd0b46e | 108 | #define SLAB_KASAN 0 |
7ed2f9e6 AP |
109 | #endif |
110 | ||
e12ba74d | 111 | /* The following flags affect the page allocator grouping pages by mobility */ |
d50112ed | 112 | /* Objects are reclaimable */ |
4fd0b46e | 113 | #define SLAB_RECLAIM_ACCOUNT ((slab_flags_t __force)0x00020000U) |
e12ba74d | 114 | #define SLAB_TEMPORARY SLAB_RECLAIM_ACCOUNT /* Objects are short-lived */ |
6cb8f913 CL |
115 | /* |
116 | * ZERO_SIZE_PTR will be returned for zero sized kmalloc requests. | |
117 | * | |
118 | * Dereferencing ZERO_SIZE_PTR will lead to a distinct access fault. | |
119 | * | |
120 | * ZERO_SIZE_PTR can be passed to kfree though in the same way that NULL can. | |
121 | * Both make kfree a no-op. | |
122 | */ | |
123 | #define ZERO_SIZE_PTR ((void *)16) | |
124 | ||
1d4ec7b1 | 125 | #define ZERO_OR_NULL_PTR(x) ((unsigned long)(x) <= \ |
6cb8f913 CL |
126 | (unsigned long)ZERO_SIZE_PTR) |
127 | ||
f1b6eb6e | 128 | #include <linux/kmemleak.h> |
0316bec2 | 129 | #include <linux/kasan.h> |
3b0efdfa | 130 | |
2633d7a0 | 131 | struct mem_cgroup; |
2e892f43 CL |
132 | /* |
133 | * struct kmem_cache related prototypes | |
134 | */ | |
135 | void __init kmem_cache_init(void); | |
fda90124 | 136 | bool slab_is_available(void); |
1da177e4 | 137 | |
2e892f43 | 138 | struct kmem_cache *kmem_cache_create(const char *, size_t, size_t, |
d50112ed | 139 | slab_flags_t, |
51cc5068 | 140 | void (*)(void *)); |
2e892f43 CL |
141 | void kmem_cache_destroy(struct kmem_cache *); |
142 | int kmem_cache_shrink(struct kmem_cache *); | |
2a4db7eb VD |
143 | |
144 | void memcg_create_kmem_cache(struct mem_cgroup *, struct kmem_cache *); | |
145 | void memcg_deactivate_kmem_caches(struct mem_cgroup *); | |
146 | void memcg_destroy_kmem_caches(struct mem_cgroup *); | |
2e892f43 | 147 | |
0a31bd5f CL |
148 | /* |
149 | * Please use this macro to create slab caches. Simply specify the | |
150 | * name of the structure and maybe some flags that are listed above. | |
151 | * | |
152 | * The alignment of the struct determines object alignment. If you | |
153 | * f.e. add ____cacheline_aligned_in_smp to the struct declaration | |
154 | * then the objects will be properly aligned in SMP configurations. | |
155 | */ | |
156 | #define KMEM_CACHE(__struct, __flags) kmem_cache_create(#__struct,\ | |
157 | sizeof(struct __struct), __alignof__(struct __struct),\ | |
20c2df83 | 158 | (__flags), NULL) |
0a31bd5f | 159 | |
34504667 CL |
160 | /* |
161 | * Common kmalloc functions provided by all allocators | |
162 | */ | |
163 | void * __must_check __krealloc(const void *, size_t, gfp_t); | |
164 | void * __must_check krealloc(const void *, size_t, gfp_t); | |
165 | void kfree(const void *); | |
166 | void kzfree(const void *); | |
167 | size_t ksize(const void *); | |
168 | ||
f5509cc1 KC |
169 | #ifdef CONFIG_HAVE_HARDENED_USERCOPY_ALLOCATOR |
170 | const char *__check_heap_object(const void *ptr, unsigned long n, | |
171 | struct page *page); | |
172 | #else | |
173 | static inline const char *__check_heap_object(const void *ptr, | |
174 | unsigned long n, | |
175 | struct page *page) | |
176 | { | |
177 | return NULL; | |
178 | } | |
179 | #endif | |
180 | ||
c601fd69 CL |
181 | /* |
182 | * Some archs want to perform DMA into kmalloc caches and need a guaranteed | |
183 | * alignment larger than the alignment of a 64-bit integer. | |
184 | * Setting ARCH_KMALLOC_MINALIGN in arch headers allows that. | |
185 | */ | |
186 | #if defined(ARCH_DMA_MINALIGN) && ARCH_DMA_MINALIGN > 8 | |
187 | #define ARCH_KMALLOC_MINALIGN ARCH_DMA_MINALIGN | |
188 | #define KMALLOC_MIN_SIZE ARCH_DMA_MINALIGN | |
189 | #define KMALLOC_SHIFT_LOW ilog2(ARCH_DMA_MINALIGN) | |
190 | #else | |
191 | #define ARCH_KMALLOC_MINALIGN __alignof__(unsigned long long) | |
192 | #endif | |
193 | ||
94a58c36 RV |
194 | /* |
195 | * Setting ARCH_SLAB_MINALIGN in arch headers allows a different alignment. | |
196 | * Intended for arches that get misalignment faults even for 64 bit integer | |
197 | * aligned buffers. | |
198 | */ | |
199 | #ifndef ARCH_SLAB_MINALIGN | |
200 | #define ARCH_SLAB_MINALIGN __alignof__(unsigned long long) | |
201 | #endif | |
202 | ||
203 | /* | |
204 | * kmalloc and friends return ARCH_KMALLOC_MINALIGN aligned | |
205 | * pointers. kmem_cache_alloc and friends return ARCH_SLAB_MINALIGN | |
206 | * aligned pointers. | |
207 | */ | |
208 | #define __assume_kmalloc_alignment __assume_aligned(ARCH_KMALLOC_MINALIGN) | |
209 | #define __assume_slab_alignment __assume_aligned(ARCH_SLAB_MINALIGN) | |
210 | #define __assume_page_alignment __assume_aligned(PAGE_SIZE) | |
211 | ||
0aa817f0 | 212 | /* |
95a05b42 CL |
213 | * Kmalloc array related definitions |
214 | */ | |
215 | ||
216 | #ifdef CONFIG_SLAB | |
217 | /* | |
218 | * The largest kmalloc size supported by the SLAB allocators is | |
0aa817f0 CL |
219 | * 32 megabyte (2^25) or the maximum allocatable page order if that is |
220 | * less than 32 MB. | |
221 | * | |
222 | * WARNING: Its not easy to increase this value since the allocators have | |
223 | * to do various tricks to work around compiler limitations in order to | |
224 | * ensure proper constant folding. | |
225 | */ | |
debee076 CL |
226 | #define KMALLOC_SHIFT_HIGH ((MAX_ORDER + PAGE_SHIFT - 1) <= 25 ? \ |
227 | (MAX_ORDER + PAGE_SHIFT - 1) : 25) | |
95a05b42 | 228 | #define KMALLOC_SHIFT_MAX KMALLOC_SHIFT_HIGH |
c601fd69 | 229 | #ifndef KMALLOC_SHIFT_LOW |
95a05b42 | 230 | #define KMALLOC_SHIFT_LOW 5 |
c601fd69 | 231 | #endif |
069e2b35 CL |
232 | #endif |
233 | ||
234 | #ifdef CONFIG_SLUB | |
95a05b42 | 235 | /* |
433a91ff DH |
236 | * SLUB directly allocates requests fitting in to an order-1 page |
237 | * (PAGE_SIZE*2). Larger requests are passed to the page allocator. | |
95a05b42 CL |
238 | */ |
239 | #define KMALLOC_SHIFT_HIGH (PAGE_SHIFT + 1) | |
bb1107f7 | 240 | #define KMALLOC_SHIFT_MAX (MAX_ORDER + PAGE_SHIFT - 1) |
c601fd69 | 241 | #ifndef KMALLOC_SHIFT_LOW |
95a05b42 CL |
242 | #define KMALLOC_SHIFT_LOW 3 |
243 | #endif | |
c601fd69 | 244 | #endif |
0aa817f0 | 245 | |
069e2b35 CL |
246 | #ifdef CONFIG_SLOB |
247 | /* | |
433a91ff | 248 | * SLOB passes all requests larger than one page to the page allocator. |
069e2b35 CL |
249 | * No kmalloc array is necessary since objects of different sizes can |
250 | * be allocated from the same page. | |
251 | */ | |
069e2b35 | 252 | #define KMALLOC_SHIFT_HIGH PAGE_SHIFT |
bb1107f7 | 253 | #define KMALLOC_SHIFT_MAX (MAX_ORDER + PAGE_SHIFT - 1) |
069e2b35 CL |
254 | #ifndef KMALLOC_SHIFT_LOW |
255 | #define KMALLOC_SHIFT_LOW 3 | |
256 | #endif | |
257 | #endif | |
258 | ||
95a05b42 CL |
259 | /* Maximum allocatable size */ |
260 | #define KMALLOC_MAX_SIZE (1UL << KMALLOC_SHIFT_MAX) | |
261 | /* Maximum size for which we actually use a slab cache */ | |
262 | #define KMALLOC_MAX_CACHE_SIZE (1UL << KMALLOC_SHIFT_HIGH) | |
263 | /* Maximum order allocatable via the slab allocagtor */ | |
264 | #define KMALLOC_MAX_ORDER (KMALLOC_SHIFT_MAX - PAGE_SHIFT) | |
0aa817f0 | 265 | |
ce6a5026 CL |
266 | /* |
267 | * Kmalloc subsystem. | |
268 | */ | |
c601fd69 | 269 | #ifndef KMALLOC_MIN_SIZE |
95a05b42 | 270 | #define KMALLOC_MIN_SIZE (1 << KMALLOC_SHIFT_LOW) |
ce6a5026 CL |
271 | #endif |
272 | ||
24f870d8 JK |
273 | /* |
274 | * This restriction comes from byte sized index implementation. | |
275 | * Page size is normally 2^12 bytes and, in this case, if we want to use | |
276 | * byte sized index which can represent 2^8 entries, the size of the object | |
277 | * should be equal or greater to 2^12 / 2^8 = 2^4 = 16. | |
278 | * If minimum size of kmalloc is less than 16, we use it as minimum object | |
279 | * size and give up to use byte sized index. | |
280 | */ | |
281 | #define SLAB_OBJ_MIN_SIZE (KMALLOC_MIN_SIZE < 16 ? \ | |
282 | (KMALLOC_MIN_SIZE) : 16) | |
283 | ||
069e2b35 | 284 | #ifndef CONFIG_SLOB |
9425c58e CL |
285 | extern struct kmem_cache *kmalloc_caches[KMALLOC_SHIFT_HIGH + 1]; |
286 | #ifdef CONFIG_ZONE_DMA | |
287 | extern struct kmem_cache *kmalloc_dma_caches[KMALLOC_SHIFT_HIGH + 1]; | |
288 | #endif | |
289 | ||
ce6a5026 CL |
290 | /* |
291 | * Figure out which kmalloc slab an allocation of a certain size | |
292 | * belongs to. | |
293 | * 0 = zero alloc | |
294 | * 1 = 65 .. 96 bytes | |
1ed58b60 RV |
295 | * 2 = 129 .. 192 bytes |
296 | * n = 2^(n-1)+1 .. 2^n | |
ce6a5026 CL |
297 | */ |
298 | static __always_inline int kmalloc_index(size_t size) | |
299 | { | |
300 | if (!size) | |
301 | return 0; | |
302 | ||
303 | if (size <= KMALLOC_MIN_SIZE) | |
304 | return KMALLOC_SHIFT_LOW; | |
305 | ||
306 | if (KMALLOC_MIN_SIZE <= 32 && size > 64 && size <= 96) | |
307 | return 1; | |
308 | if (KMALLOC_MIN_SIZE <= 64 && size > 128 && size <= 192) | |
309 | return 2; | |
310 | if (size <= 8) return 3; | |
311 | if (size <= 16) return 4; | |
312 | if (size <= 32) return 5; | |
313 | if (size <= 64) return 6; | |
314 | if (size <= 128) return 7; | |
315 | if (size <= 256) return 8; | |
316 | if (size <= 512) return 9; | |
317 | if (size <= 1024) return 10; | |
318 | if (size <= 2 * 1024) return 11; | |
319 | if (size <= 4 * 1024) return 12; | |
320 | if (size <= 8 * 1024) return 13; | |
321 | if (size <= 16 * 1024) return 14; | |
322 | if (size <= 32 * 1024) return 15; | |
323 | if (size <= 64 * 1024) return 16; | |
324 | if (size <= 128 * 1024) return 17; | |
325 | if (size <= 256 * 1024) return 18; | |
326 | if (size <= 512 * 1024) return 19; | |
327 | if (size <= 1024 * 1024) return 20; | |
328 | if (size <= 2 * 1024 * 1024) return 21; | |
329 | if (size <= 4 * 1024 * 1024) return 22; | |
330 | if (size <= 8 * 1024 * 1024) return 23; | |
331 | if (size <= 16 * 1024 * 1024) return 24; | |
332 | if (size <= 32 * 1024 * 1024) return 25; | |
333 | if (size <= 64 * 1024 * 1024) return 26; | |
334 | BUG(); | |
335 | ||
336 | /* Will never be reached. Needed because the compiler may complain */ | |
337 | return -1; | |
338 | } | |
069e2b35 | 339 | #endif /* !CONFIG_SLOB */ |
ce6a5026 | 340 | |
48a27055 RV |
341 | void *__kmalloc(size_t size, gfp_t flags) __assume_kmalloc_alignment __malloc; |
342 | void *kmem_cache_alloc(struct kmem_cache *, gfp_t flags) __assume_slab_alignment __malloc; | |
2a4db7eb | 343 | void kmem_cache_free(struct kmem_cache *, void *); |
f1b6eb6e | 344 | |
484748f0 | 345 | /* |
9f706d68 | 346 | * Bulk allocation and freeing operations. These are accelerated in an |
484748f0 CL |
347 | * allocator specific way to avoid taking locks repeatedly or building |
348 | * metadata structures unnecessarily. | |
349 | * | |
350 | * Note that interrupts must be enabled when calling these functions. | |
351 | */ | |
352 | void kmem_cache_free_bulk(struct kmem_cache *, size_t, void **); | |
865762a8 | 353 | int kmem_cache_alloc_bulk(struct kmem_cache *, gfp_t, size_t, void **); |
484748f0 | 354 | |
ca257195 JDB |
355 | /* |
356 | * Caller must not use kfree_bulk() on memory not originally allocated | |
357 | * by kmalloc(), because the SLOB allocator cannot handle this. | |
358 | */ | |
359 | static __always_inline void kfree_bulk(size_t size, void **p) | |
360 | { | |
361 | kmem_cache_free_bulk(NULL, size, p); | |
362 | } | |
363 | ||
f1b6eb6e | 364 | #ifdef CONFIG_NUMA |
48a27055 RV |
365 | void *__kmalloc_node(size_t size, gfp_t flags, int node) __assume_kmalloc_alignment __malloc; |
366 | void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node) __assume_slab_alignment __malloc; | |
f1b6eb6e CL |
367 | #else |
368 | static __always_inline void *__kmalloc_node(size_t size, gfp_t flags, int node) | |
369 | { | |
370 | return __kmalloc(size, flags); | |
371 | } | |
372 | ||
373 | static __always_inline void *kmem_cache_alloc_node(struct kmem_cache *s, gfp_t flags, int node) | |
374 | { | |
375 | return kmem_cache_alloc(s, flags); | |
376 | } | |
377 | #endif | |
378 | ||
379 | #ifdef CONFIG_TRACING | |
48a27055 | 380 | extern void *kmem_cache_alloc_trace(struct kmem_cache *, gfp_t, size_t) __assume_slab_alignment __malloc; |
f1b6eb6e CL |
381 | |
382 | #ifdef CONFIG_NUMA | |
383 | extern void *kmem_cache_alloc_node_trace(struct kmem_cache *s, | |
384 | gfp_t gfpflags, | |
48a27055 | 385 | int node, size_t size) __assume_slab_alignment __malloc; |
f1b6eb6e CL |
386 | #else |
387 | static __always_inline void * | |
388 | kmem_cache_alloc_node_trace(struct kmem_cache *s, | |
389 | gfp_t gfpflags, | |
390 | int node, size_t size) | |
391 | { | |
392 | return kmem_cache_alloc_trace(s, gfpflags, size); | |
393 | } | |
394 | #endif /* CONFIG_NUMA */ | |
395 | ||
396 | #else /* CONFIG_TRACING */ | |
397 | static __always_inline void *kmem_cache_alloc_trace(struct kmem_cache *s, | |
398 | gfp_t flags, size_t size) | |
399 | { | |
0316bec2 AR |
400 | void *ret = kmem_cache_alloc(s, flags); |
401 | ||
505f5dcb | 402 | kasan_kmalloc(s, ret, size, flags); |
0316bec2 | 403 | return ret; |
f1b6eb6e CL |
404 | } |
405 | ||
406 | static __always_inline void * | |
407 | kmem_cache_alloc_node_trace(struct kmem_cache *s, | |
408 | gfp_t gfpflags, | |
409 | int node, size_t size) | |
410 | { | |
0316bec2 AR |
411 | void *ret = kmem_cache_alloc_node(s, gfpflags, node); |
412 | ||
505f5dcb | 413 | kasan_kmalloc(s, ret, size, gfpflags); |
0316bec2 | 414 | return ret; |
f1b6eb6e CL |
415 | } |
416 | #endif /* CONFIG_TRACING */ | |
417 | ||
48a27055 | 418 | extern void *kmalloc_order(size_t size, gfp_t flags, unsigned int order) __assume_page_alignment __malloc; |
f1b6eb6e CL |
419 | |
420 | #ifdef CONFIG_TRACING | |
48a27055 | 421 | extern void *kmalloc_order_trace(size_t size, gfp_t flags, unsigned int order) __assume_page_alignment __malloc; |
f1b6eb6e CL |
422 | #else |
423 | static __always_inline void * | |
424 | kmalloc_order_trace(size_t size, gfp_t flags, unsigned int order) | |
425 | { | |
426 | return kmalloc_order(size, flags, order); | |
427 | } | |
ce6a5026 CL |
428 | #endif |
429 | ||
f1b6eb6e CL |
430 | static __always_inline void *kmalloc_large(size_t size, gfp_t flags) |
431 | { | |
432 | unsigned int order = get_order(size); | |
433 | return kmalloc_order_trace(size, flags, order); | |
434 | } | |
435 | ||
436 | /** | |
437 | * kmalloc - allocate memory | |
438 | * @size: how many bytes of memory are required. | |
7e3528c3 | 439 | * @flags: the type of memory to allocate. |
f1b6eb6e CL |
440 | * |
441 | * kmalloc is the normal method of allocating memory | |
442 | * for objects smaller than page size in the kernel. | |
7e3528c3 RD |
443 | * |
444 | * The @flags argument may be one of: | |
445 | * | |
446 | * %GFP_USER - Allocate memory on behalf of user. May sleep. | |
447 | * | |
448 | * %GFP_KERNEL - Allocate normal kernel ram. May sleep. | |
449 | * | |
450 | * %GFP_ATOMIC - Allocation will not sleep. May use emergency pools. | |
451 | * For example, use this inside interrupt handlers. | |
452 | * | |
453 | * %GFP_HIGHUSER - Allocate pages from high memory. | |
454 | * | |
455 | * %GFP_NOIO - Do not do any I/O at all while trying to get memory. | |
456 | * | |
457 | * %GFP_NOFS - Do not make any fs calls while trying to get memory. | |
458 | * | |
459 | * %GFP_NOWAIT - Allocation will not sleep. | |
460 | * | |
e97ca8e5 | 461 | * %__GFP_THISNODE - Allocate node-local memory only. |
7e3528c3 RD |
462 | * |
463 | * %GFP_DMA - Allocation suitable for DMA. | |
464 | * Should only be used for kmalloc() caches. Otherwise, use a | |
465 | * slab created with SLAB_DMA. | |
466 | * | |
467 | * Also it is possible to set different flags by OR'ing | |
468 | * in one or more of the following additional @flags: | |
469 | * | |
7e3528c3 RD |
470 | * %__GFP_HIGH - This allocation has high priority and may use emergency pools. |
471 | * | |
472 | * %__GFP_NOFAIL - Indicate that this allocation is in no way allowed to fail | |
473 | * (think twice before using). | |
474 | * | |
475 | * %__GFP_NORETRY - If memory is not immediately available, | |
476 | * then give up at once. | |
477 | * | |
478 | * %__GFP_NOWARN - If allocation fails, don't issue any warnings. | |
479 | * | |
dcda9b04 MH |
480 | * %__GFP_RETRY_MAYFAIL - Try really hard to succeed the allocation but fail |
481 | * eventually. | |
7e3528c3 RD |
482 | * |
483 | * There are other flags available as well, but these are not intended | |
484 | * for general use, and so are not documented here. For a full list of | |
485 | * potential flags, always refer to linux/gfp.h. | |
f1b6eb6e CL |
486 | */ |
487 | static __always_inline void *kmalloc(size_t size, gfp_t flags) | |
488 | { | |
489 | if (__builtin_constant_p(size)) { | |
490 | if (size > KMALLOC_MAX_CACHE_SIZE) | |
491 | return kmalloc_large(size, flags); | |
492 | #ifndef CONFIG_SLOB | |
493 | if (!(flags & GFP_DMA)) { | |
494 | int index = kmalloc_index(size); | |
495 | ||
496 | if (!index) | |
497 | return ZERO_SIZE_PTR; | |
498 | ||
499 | return kmem_cache_alloc_trace(kmalloc_caches[index], | |
500 | flags, size); | |
501 | } | |
502 | #endif | |
503 | } | |
504 | return __kmalloc(size, flags); | |
505 | } | |
506 | ||
ce6a5026 CL |
507 | /* |
508 | * Determine size used for the nth kmalloc cache. | |
509 | * return size or 0 if a kmalloc cache for that | |
510 | * size does not exist | |
511 | */ | |
512 | static __always_inline int kmalloc_size(int n) | |
513 | { | |
069e2b35 | 514 | #ifndef CONFIG_SLOB |
ce6a5026 CL |
515 | if (n > 2) |
516 | return 1 << n; | |
517 | ||
518 | if (n == 1 && KMALLOC_MIN_SIZE <= 32) | |
519 | return 96; | |
520 | ||
521 | if (n == 2 && KMALLOC_MIN_SIZE <= 64) | |
522 | return 192; | |
069e2b35 | 523 | #endif |
ce6a5026 CL |
524 | return 0; |
525 | } | |
ce6a5026 | 526 | |
f1b6eb6e CL |
527 | static __always_inline void *kmalloc_node(size_t size, gfp_t flags, int node) |
528 | { | |
529 | #ifndef CONFIG_SLOB | |
530 | if (__builtin_constant_p(size) && | |
23774a2f | 531 | size <= KMALLOC_MAX_CACHE_SIZE && !(flags & GFP_DMA)) { |
f1b6eb6e CL |
532 | int i = kmalloc_index(size); |
533 | ||
534 | if (!i) | |
535 | return ZERO_SIZE_PTR; | |
536 | ||
537 | return kmem_cache_alloc_node_trace(kmalloc_caches[i], | |
538 | flags, node, size); | |
539 | } | |
540 | #endif | |
541 | return __kmalloc_node(size, flags, node); | |
542 | } | |
543 | ||
f7ce3190 VD |
544 | struct memcg_cache_array { |
545 | struct rcu_head rcu; | |
546 | struct kmem_cache *entries[0]; | |
547 | }; | |
548 | ||
ba6c496e GC |
549 | /* |
550 | * This is the main placeholder for memcg-related information in kmem caches. | |
ba6c496e GC |
551 | * Both the root cache and the child caches will have it. For the root cache, |
552 | * this will hold a dynamically allocated array large enough to hold | |
f8570263 VD |
553 | * information about the currently limited memcgs in the system. To allow the |
554 | * array to be accessed without taking any locks, on relocation we free the old | |
555 | * version only after a grace period. | |
ba6c496e | 556 | * |
9eeadc8b | 557 | * Root and child caches hold different metadata. |
ba6c496e | 558 | * |
9eeadc8b TH |
559 | * @root_cache: Common to root and child caches. NULL for root, pointer to |
560 | * the root cache for children. | |
426589f5 | 561 | * |
9eeadc8b TH |
562 | * The following fields are specific to root caches. |
563 | * | |
564 | * @memcg_caches: kmemcg ID indexed table of child caches. This table is | |
565 | * used to index child cachces during allocation and cleared | |
566 | * early during shutdown. | |
567 | * | |
510ded33 TH |
568 | * @root_caches_node: List node for slab_root_caches list. |
569 | * | |
9eeadc8b TH |
570 | * @children: List of all child caches. While the child caches are also |
571 | * reachable through @memcg_caches, a child cache remains on | |
572 | * this list until it is actually destroyed. | |
573 | * | |
574 | * The following fields are specific to child caches. | |
575 | * | |
576 | * @memcg: Pointer to the memcg this cache belongs to. | |
577 | * | |
578 | * @children_node: List node for @root_cache->children list. | |
bc2791f8 TH |
579 | * |
580 | * @kmem_caches_node: List node for @memcg->kmem_caches list. | |
ba6c496e GC |
581 | */ |
582 | struct memcg_cache_params { | |
9eeadc8b | 583 | struct kmem_cache *root_cache; |
ba6c496e | 584 | union { |
9eeadc8b TH |
585 | struct { |
586 | struct memcg_cache_array __rcu *memcg_caches; | |
510ded33 | 587 | struct list_head __root_caches_node; |
9eeadc8b TH |
588 | struct list_head children; |
589 | }; | |
2633d7a0 GC |
590 | struct { |
591 | struct mem_cgroup *memcg; | |
9eeadc8b | 592 | struct list_head children_node; |
bc2791f8 | 593 | struct list_head kmem_caches_node; |
01fb58bc TH |
594 | |
595 | void (*deact_fn)(struct kmem_cache *); | |
596 | union { | |
597 | struct rcu_head deact_rcu_head; | |
598 | struct work_struct deact_work; | |
599 | }; | |
2633d7a0 | 600 | }; |
ba6c496e GC |
601 | }; |
602 | }; | |
603 | ||
2633d7a0 GC |
604 | int memcg_update_all_caches(int num_memcgs); |
605 | ||
e7efa615 MO |
606 | /** |
607 | * kmalloc_array - allocate memory for an array. | |
608 | * @n: number of elements. | |
609 | * @size: element size. | |
610 | * @flags: the type of memory to allocate (see kmalloc). | |
800590f5 | 611 | */ |
a8203725 | 612 | static inline void *kmalloc_array(size_t n, size_t size, gfp_t flags) |
1da177e4 | 613 | { |
a3860c1c | 614 | if (size != 0 && n > SIZE_MAX / size) |
6193a2ff | 615 | return NULL; |
91c6a05f AD |
616 | if (__builtin_constant_p(n) && __builtin_constant_p(size)) |
617 | return kmalloc(n * size, flags); | |
a8203725 XW |
618 | return __kmalloc(n * size, flags); |
619 | } | |
620 | ||
621 | /** | |
622 | * kcalloc - allocate memory for an array. The memory is set to zero. | |
623 | * @n: number of elements. | |
624 | * @size: element size. | |
625 | * @flags: the type of memory to allocate (see kmalloc). | |
626 | */ | |
627 | static inline void *kcalloc(size_t n, size_t size, gfp_t flags) | |
628 | { | |
629 | return kmalloc_array(n, size, flags | __GFP_ZERO); | |
1da177e4 LT |
630 | } |
631 | ||
1d2c8eea CH |
632 | /* |
633 | * kmalloc_track_caller is a special version of kmalloc that records the | |
634 | * calling function of the routine calling it for slab leak tracking instead | |
635 | * of just the calling function (confusing, eh?). | |
636 | * It's useful when the call to kmalloc comes from a widely-used standard | |
637 | * allocator where we care about the real place the memory allocation | |
638 | * request comes from. | |
639 | */ | |
ce71e27c | 640 | extern void *__kmalloc_track_caller(size_t, gfp_t, unsigned long); |
1d2c8eea | 641 | #define kmalloc_track_caller(size, flags) \ |
ce71e27c | 642 | __kmalloc_track_caller(size, flags, _RET_IP_) |
1da177e4 | 643 | |
5799b255 JT |
644 | static inline void *kmalloc_array_node(size_t n, size_t size, gfp_t flags, |
645 | int node) | |
646 | { | |
647 | if (size != 0 && n > SIZE_MAX / size) | |
648 | return NULL; | |
649 | if (__builtin_constant_p(n) && __builtin_constant_p(size)) | |
650 | return kmalloc_node(n * size, flags, node); | |
651 | return __kmalloc_node(n * size, flags, node); | |
652 | } | |
653 | ||
654 | static inline void *kcalloc_node(size_t n, size_t size, gfp_t flags, int node) | |
655 | { | |
656 | return kmalloc_array_node(n, size, flags | __GFP_ZERO, node); | |
657 | } | |
658 | ||
659 | ||
97e2bde4 | 660 | #ifdef CONFIG_NUMA |
ce71e27c | 661 | extern void *__kmalloc_node_track_caller(size_t, gfp_t, int, unsigned long); |
8b98c169 CH |
662 | #define kmalloc_node_track_caller(size, flags, node) \ |
663 | __kmalloc_node_track_caller(size, flags, node, \ | |
ce71e27c | 664 | _RET_IP_) |
2e892f43 | 665 | |
8b98c169 | 666 | #else /* CONFIG_NUMA */ |
8b98c169 CH |
667 | |
668 | #define kmalloc_node_track_caller(size, flags, node) \ | |
669 | kmalloc_track_caller(size, flags) | |
97e2bde4 | 670 | |
dfcd3610 | 671 | #endif /* CONFIG_NUMA */ |
10cef602 | 672 | |
81cda662 CL |
673 | /* |
674 | * Shortcuts | |
675 | */ | |
676 | static inline void *kmem_cache_zalloc(struct kmem_cache *k, gfp_t flags) | |
677 | { | |
678 | return kmem_cache_alloc(k, flags | __GFP_ZERO); | |
679 | } | |
680 | ||
681 | /** | |
682 | * kzalloc - allocate memory. The memory is set to zero. | |
683 | * @size: how many bytes of memory are required. | |
684 | * @flags: the type of memory to allocate (see kmalloc). | |
685 | */ | |
686 | static inline void *kzalloc(size_t size, gfp_t flags) | |
687 | { | |
688 | return kmalloc(size, flags | __GFP_ZERO); | |
689 | } | |
690 | ||
979b0fea JL |
691 | /** |
692 | * kzalloc_node - allocate zeroed memory from a particular memory node. | |
693 | * @size: how many bytes of memory are required. | |
694 | * @flags: the type of memory to allocate (see kmalloc). | |
695 | * @node: memory node from which to allocate | |
696 | */ | |
697 | static inline void *kzalloc_node(size_t size, gfp_t flags, int node) | |
698 | { | |
699 | return kmalloc_node(size, flags | __GFP_ZERO, node); | |
700 | } | |
701 | ||
07f361b2 | 702 | unsigned int kmem_cache_size(struct kmem_cache *s); |
7e85ee0c PE |
703 | void __init kmem_cache_init_late(void); |
704 | ||
6731d4f1 SAS |
705 | #if defined(CONFIG_SMP) && defined(CONFIG_SLAB) |
706 | int slab_prepare_cpu(unsigned int cpu); | |
707 | int slab_dead_cpu(unsigned int cpu); | |
708 | #else | |
709 | #define slab_prepare_cpu NULL | |
710 | #define slab_dead_cpu NULL | |
711 | #endif | |
712 | ||
1da177e4 | 713 | #endif /* _LINUX_SLAB_H */ |