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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Christoph Lameter2e892f42006-12-13 00:34:23 -08002 * Written by Mark Hemment, 1996 (markhe@nextd.demon.co.uk).
3 *
Christoph Lametercde53532008-07-04 09:59:22 -07004 * (C) SGI 2006, Christoph Lameter
Christoph Lameter2e892f42006-12-13 00:34:23 -08005 * Cleaned up and restructured to ease the addition of alternative
6 * implementations of SLAB allocators.
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 */
8
9#ifndef _LINUX_SLAB_H
10#define _LINUX_SLAB_H
11
Andrew Morton1b1cec42006-12-06 20:33:22 -080012#include <linux/gfp.h>
Andrew Morton1b1cec42006-12-06 20:33:22 -080013#include <linux/types.h>
Glauber Costa1f458cb2012-12-18 14:22:50 -080014#include <linux/workqueue.h>
15
Linus Torvalds1da177e2005-04-16 15:20:36 -070016
Christoph Lameter2e892f42006-12-13 00:34:23 -080017/*
18 * Flags to pass to kmem_cache_create().
19 * The ones marked DEBUG are only valid if CONFIG_SLAB_DEBUG is set.
Linus Torvalds1da177e2005-04-16 15:20:36 -070020 */
Christoph Lameter55935a32006-12-13 00:34:24 -080021#define SLAB_DEBUG_FREE 0x00000100UL /* DEBUG: Perform (expensive) checks on free */
Christoph Lameter55935a32006-12-13 00:34:24 -080022#define SLAB_RED_ZONE 0x00000400UL /* DEBUG: Red zone objs in a cache */
23#define SLAB_POISON 0x00000800UL /* DEBUG: Poison objects */
24#define SLAB_HWCACHE_ALIGN 0x00002000UL /* Align objs on cache lines */
Christoph Lameter2e892f42006-12-13 00:34:23 -080025#define SLAB_CACHE_DMA 0x00004000UL /* Use GFP_DMA memory */
Christoph Lameter2e892f42006-12-13 00:34:23 -080026#define SLAB_STORE_USER 0x00010000UL /* DEBUG: Store the last owner for bug hunting */
Christoph Lameter2e892f42006-12-13 00:34:23 -080027#define SLAB_PANIC 0x00040000UL /* Panic if kmem_cache_create() fails */
Peter Zijlstrad7de4c12008-11-13 20:40:12 +020028/*
29 * SLAB_DESTROY_BY_RCU - **WARNING** READ THIS!
30 *
31 * This delays freeing the SLAB page by a grace period, it does _NOT_
32 * delay object freeing. This means that if you do kmem_cache_free()
33 * that memory location is free to be reused at any time. Thus it may
34 * be possible to see another object there in the same RCU grace period.
35 *
36 * This feature only ensures the memory location backing the object
37 * stays valid, the trick to using this is relying on an independent
38 * object validation pass. Something like:
39 *
40 * rcu_read_lock()
41 * again:
42 * obj = lockless_lookup(key);
43 * if (obj) {
44 * if (!try_get_ref(obj)) // might fail for free objects
45 * goto again;
46 *
47 * if (obj->key != key) { // not the object we expected
48 * put_ref(obj);
49 * goto again;
50 * }
51 * }
52 * rcu_read_unlock();
53 *
54 * See also the comment on struct slab_rcu in mm/slab.c.
55 */
Christoph Lameter2e892f42006-12-13 00:34:23 -080056#define SLAB_DESTROY_BY_RCU 0x00080000UL /* Defer freeing slabs to RCU */
Paul Jackson101a5002006-03-24 03:16:07 -080057#define SLAB_MEM_SPREAD 0x00100000UL /* Spread some memory over cpuset */
Christoph Lameter81819f02007-05-06 14:49:36 -070058#define SLAB_TRACE 0x00200000UL /* Trace allocations and frees */
Linus Torvalds1da177e2005-04-16 15:20:36 -070059
Thomas Gleixner30327ac2008-04-30 00:54:59 -070060/* Flag to prevent checks on free */
61#ifdef CONFIG_DEBUG_OBJECTS
62# define SLAB_DEBUG_OBJECTS 0x00400000UL
63#else
64# define SLAB_DEBUG_OBJECTS 0x00000000UL
65#endif
66
Catalin Marinasd5cff632009-06-11 13:22:40 +010067#define SLAB_NOLEAKTRACE 0x00800000UL /* Avoid kmemleak tracing */
68
Vegard Nossum2dff4402008-05-31 15:56:17 +020069/* Don't track use of uninitialized memory */
70#ifdef CONFIG_KMEMCHECK
71# define SLAB_NOTRACK 0x01000000UL
72#else
73# define SLAB_NOTRACK 0x00000000UL
74#endif
Dmitry Monakhov4c13dd32010-02-26 09:36:12 +030075#ifdef CONFIG_FAILSLAB
76# define SLAB_FAILSLAB 0x02000000UL /* Fault injection mark */
77#else
78# define SLAB_FAILSLAB 0x00000000UL
79#endif
Vegard Nossum2dff4402008-05-31 15:56:17 +020080
Mel Gormane12ba742007-10-16 01:25:52 -070081/* The following flags affect the page allocator grouping pages by mobility */
82#define SLAB_RECLAIM_ACCOUNT 0x00020000UL /* Objects are reclaimable */
83#define SLAB_TEMPORARY SLAB_RECLAIM_ACCOUNT /* Objects are short-lived */
Christoph Lameter2e892f42006-12-13 00:34:23 -080084/*
Christoph Lameter6cb8f912007-07-17 04:03:22 -070085 * ZERO_SIZE_PTR will be returned for zero sized kmalloc requests.
86 *
87 * Dereferencing ZERO_SIZE_PTR will lead to a distinct access fault.
88 *
89 * ZERO_SIZE_PTR can be passed to kfree though in the same way that NULL can.
90 * Both make kfree a no-op.
91 */
92#define ZERO_SIZE_PTR ((void *)16)
93
Roland Dreier1d4ec7b2007-07-20 12:13:20 -070094#define ZERO_OR_NULL_PTR(x) ((unsigned long)(x) <= \
Christoph Lameter6cb8f912007-07-17 04:03:22 -070095 (unsigned long)ZERO_SIZE_PTR)
96
97/*
Christoph Lameter3b0efdf2012-06-13 10:24:57 -050098 * Common fields provided in kmem_cache by all slab allocators
99 * This struct is either used directly by the allocator (SLOB)
100 * or the allocator must include definitions for all fields
101 * provided in kmem_cache_common in their definition of kmem_cache.
102 *
103 * Once we can do anonymous structs (C11 standard) we could put a
104 * anonymous struct definition in these allocators so that the
105 * separate allocations in the kmem_cache structure of SLAB and
106 * SLUB is no longer needed.
107 */
108#ifdef CONFIG_SLOB
109struct kmem_cache {
110 unsigned int object_size;/* The original size of the object */
111 unsigned int size; /* The aligned/padded/added on size */
112 unsigned int align; /* Alignment as calculated */
113 unsigned long flags; /* Active flags on the slab */
114 const char *name; /* Slab name for sysfs */
115 int refcount; /* Use counter */
116 void (*ctor)(void *); /* Called on object slot creation */
117 struct list_head list; /* List of all slab caches on the system */
118};
119#endif
120
Glauber Costa2633d7a2012-12-18 14:22:34 -0800121struct mem_cgroup;
Christoph Lameter3b0efdf2012-06-13 10:24:57 -0500122/*
Christoph Lameter2e892f42006-12-13 00:34:23 -0800123 * struct kmem_cache related prototypes
124 */
125void __init kmem_cache_init(void);
Christoph Lameter81819f02007-05-06 14:49:36 -0700126int slab_is_available(void);
Matt Mackall10cef602006-01-08 01:01:45 -0800127
Christoph Lameter2e892f42006-12-13 00:34:23 -0800128struct kmem_cache *kmem_cache_create(const char *, size_t, size_t,
Christoph Lameterebe29732006-12-06 20:32:59 -0800129 unsigned long,
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700130 void (*)(void *));
Glauber Costa2633d7a2012-12-18 14:22:34 -0800131struct kmem_cache *
132kmem_cache_create_memcg(struct mem_cgroup *, const char *, size_t, size_t,
Glauber Costa943a4512012-12-18 14:23:03 -0800133 unsigned long, void (*)(void *), struct kmem_cache *);
Christoph Lameter2e892f42006-12-13 00:34:23 -0800134void kmem_cache_destroy(struct kmem_cache *);
135int kmem_cache_shrink(struct kmem_cache *);
Christoph Lameter2e892f42006-12-13 00:34:23 -0800136void kmem_cache_free(struct kmem_cache *, void *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137
Christoph Lameter0a31bd52007-05-06 14:49:57 -0700138/*
139 * Please use this macro to create slab caches. Simply specify the
140 * name of the structure and maybe some flags that are listed above.
141 *
142 * The alignment of the struct determines object alignment. If you
143 * f.e. add ____cacheline_aligned_in_smp to the struct declaration
144 * then the objects will be properly aligned in SMP configurations.
145 */
146#define KMEM_CACHE(__struct, __flags) kmem_cache_create(#__struct,\
147 sizeof(struct __struct), __alignof__(struct __struct),\
Paul Mundt20c2df82007-07-20 10:11:58 +0900148 (__flags), NULL)
Christoph Lameter0a31bd52007-05-06 14:49:57 -0700149
Christoph Lameter2e892f42006-12-13 00:34:23 -0800150/*
Christoph Lameter0aa817f2007-05-16 22:11:01 -0700151 * The largest kmalloc size supported by the slab allocators is
152 * 32 megabyte (2^25) or the maximum allocatable page order if that is
153 * less than 32 MB.
154 *
155 * WARNING: Its not easy to increase this value since the allocators have
156 * to do various tricks to work around compiler limitations in order to
157 * ensure proper constant folding.
158 */
Christoph Lameterdebee072007-06-23 17:16:43 -0700159#define KMALLOC_SHIFT_HIGH ((MAX_ORDER + PAGE_SHIFT - 1) <= 25 ? \
160 (MAX_ORDER + PAGE_SHIFT - 1) : 25)
Christoph Lameter0aa817f2007-05-16 22:11:01 -0700161
162#define KMALLOC_MAX_SIZE (1UL << KMALLOC_SHIFT_HIGH)
163#define KMALLOC_MAX_ORDER (KMALLOC_SHIFT_HIGH - PAGE_SHIFT)
164
Christoph Lameter90810642011-06-23 09:36:12 -0500165/*
166 * Some archs want to perform DMA into kmalloc caches and need a guaranteed
167 * alignment larger than the alignment of a 64-bit integer.
168 * Setting ARCH_KMALLOC_MINALIGN in arch headers allows that.
169 */
Christoph Lameter3192b922011-06-14 16:16:36 -0500170#ifdef ARCH_DMA_MINALIGN
171#define ARCH_KMALLOC_MINALIGN ARCH_DMA_MINALIGN
172#else
173#define ARCH_KMALLOC_MINALIGN __alignof__(unsigned long long)
174#endif
175
Christoph Lameter90810642011-06-23 09:36:12 -0500176/*
177 * Setting ARCH_SLAB_MINALIGN in arch headers allows a different alignment.
178 * Intended for arches that get misalignment faults even for 64 bit integer
179 * aligned buffers.
180 */
Christoph Lameter3192b922011-06-14 16:16:36 -0500181#ifndef ARCH_SLAB_MINALIGN
182#define ARCH_SLAB_MINALIGN __alignof__(unsigned long long)
183#endif
Christoph Lameter0aa817f2007-05-16 22:11:01 -0700184/*
Glauber Costaba6c4962012-12-18 14:22:27 -0800185 * This is the main placeholder for memcg-related information in kmem caches.
186 * struct kmem_cache will hold a pointer to it, so the memory cost while
187 * disabled is 1 pointer. The runtime cost while enabled, gets bigger than it
188 * would otherwise be if that would be bundled in kmem_cache: we'll need an
189 * extra pointer chase. But the trade off clearly lays in favor of not
190 * penalizing non-users.
191 *
192 * Both the root cache and the child caches will have it. For the root cache,
193 * this will hold a dynamically allocated array large enough to hold
194 * information about the currently limited memcgs in the system.
195 *
196 * Child caches will hold extra metadata needed for its operation. Fields are:
197 *
198 * @memcg: pointer to the memcg this cache belongs to
Glauber Costa2633d7a2012-12-18 14:22:34 -0800199 * @list: list_head for the list of all caches in this memcg
200 * @root_cache: pointer to the global, root cache, this cache was derived from
Glauber Costa1f458cb2012-12-18 14:22:50 -0800201 * @dead: set to true after the memcg dies; the cache may still be around.
202 * @nr_pages: number of pages that belongs to this cache.
203 * @destroy: worker to be called whenever we are ready, or believe we may be
204 * ready, to destroy this cache.
Glauber Costaba6c4962012-12-18 14:22:27 -0800205 */
206struct memcg_cache_params {
207 bool is_root_cache;
208 union {
209 struct kmem_cache *memcg_caches[0];
Glauber Costa2633d7a2012-12-18 14:22:34 -0800210 struct {
211 struct mem_cgroup *memcg;
212 struct list_head list;
213 struct kmem_cache *root_cache;
Glauber Costa1f458cb2012-12-18 14:22:50 -0800214 bool dead;
215 atomic_t nr_pages;
216 struct work_struct destroy;
Glauber Costa2633d7a2012-12-18 14:22:34 -0800217 };
Glauber Costaba6c4962012-12-18 14:22:27 -0800218 };
219};
220
Glauber Costa2633d7a2012-12-18 14:22:34 -0800221int memcg_update_all_caches(int num_memcgs);
222
Glauber Costa749c5412012-12-18 14:23:01 -0800223struct seq_file;
224int cache_show(struct kmem_cache *s, struct seq_file *m);
225void print_slabinfo_header(struct seq_file *m);
226
Glauber Costaba6c4962012-12-18 14:22:27 -0800227/*
Christoph Lameter2e892f42006-12-13 00:34:23 -0800228 * Common kmalloc functions provided by all allocators
229 */
Pekka Enberg93bc4e82008-07-26 17:49:33 -0700230void * __must_check __krealloc(const void *, size_t, gfp_t);
Pekka Enbergfd76bab2007-05-06 14:48:40 -0700231void * __must_check krealloc(const void *, size_t, gfp_t);
Christoph Lameter2e892f42006-12-13 00:34:23 -0800232void kfree(const void *);
Johannes Weiner3ef0e5b2009-02-20 15:38:41 -0800233void kzfree(const void *);
Pekka Enbergfd76bab2007-05-06 14:48:40 -0700234size_t ksize(const void *);
Christoph Lameter2e892f42006-12-13 00:34:23 -0800235
Christoph Lameter81cda662007-07-17 04:03:29 -0700236/*
237 * Allocator specific definitions. These are mainly used to establish optimized
238 * ways to convert kmalloc() calls to kmem_cache_alloc() invocations by
239 * selecting the appropriate general cache at compile time.
240 *
241 * Allocators must define at least:
242 *
243 * kmem_cache_alloc()
244 * __kmalloc()
245 * kmalloc()
246 *
247 * Those wishing to support NUMA must also define:
248 *
249 * kmem_cache_alloc_node()
250 * kmalloc_node()
251 *
252 * See each allocator definition file for additional comments and
253 * implementation notes.
254 */
255#ifdef CONFIG_SLUB
256#include <linux/slub_def.h>
257#elif defined(CONFIG_SLOB)
258#include <linux/slob_def.h>
259#else
260#include <linux/slab_def.h>
261#endif
262
Christoph Lameter2e892f42006-12-13 00:34:23 -0800263/**
Xi Wanga8203722012-03-05 15:14:41 -0800264 * kmalloc_array - allocate memory for an array.
Christoph Lameter2e892f42006-12-13 00:34:23 -0800265 * @n: number of elements.
266 * @size: element size.
267 * @flags: the type of memory to allocate.
Paul Drynoff800590f2006-06-23 02:03:48 -0700268 *
269 * The @flags argument may be one of:
270 *
271 * %GFP_USER - Allocate memory on behalf of user. May sleep.
272 *
273 * %GFP_KERNEL - Allocate normal kernel ram. May sleep.
274 *
Paul Mundt6193a2f2007-07-15 23:38:22 -0700275 * %GFP_ATOMIC - Allocation will not sleep. May use emergency pools.
Paul Drynoff800590f2006-06-23 02:03:48 -0700276 * For example, use this inside interrupt handlers.
277 *
278 * %GFP_HIGHUSER - Allocate pages from high memory.
279 *
280 * %GFP_NOIO - Do not do any I/O at all while trying to get memory.
281 *
282 * %GFP_NOFS - Do not make any fs calls while trying to get memory.
283 *
Paul Mundt6193a2f2007-07-15 23:38:22 -0700284 * %GFP_NOWAIT - Allocation will not sleep.
285 *
286 * %GFP_THISNODE - Allocate node-local memory only.
287 *
288 * %GFP_DMA - Allocation suitable for DMA.
289 * Should only be used for kmalloc() caches. Otherwise, use a
290 * slab created with SLAB_DMA.
291 *
Paul Drynoff800590f2006-06-23 02:03:48 -0700292 * Also it is possible to set different flags by OR'ing
293 * in one or more of the following additional @flags:
294 *
295 * %__GFP_COLD - Request cache-cold pages instead of
296 * trying to return cache-warm pages.
297 *
Paul Drynoff800590f2006-06-23 02:03:48 -0700298 * %__GFP_HIGH - This allocation has high priority and may use emergency pools.
299 *
Paul Drynoff800590f2006-06-23 02:03:48 -0700300 * %__GFP_NOFAIL - Indicate that this allocation is in no way allowed to fail
301 * (think twice before using).
302 *
303 * %__GFP_NORETRY - If memory is not immediately available,
304 * then give up at once.
305 *
306 * %__GFP_NOWARN - If allocation fails, don't issue any warnings.
307 *
308 * %__GFP_REPEAT - If allocation fails initially, try once more before failing.
Paul Mundt6193a2f2007-07-15 23:38:22 -0700309 *
310 * There are other flags available as well, but these are not intended
311 * for general use, and so are not documented here. For a full list of
312 * potential flags, always refer to linux/gfp.h.
Paul Drynoff800590f2006-06-23 02:03:48 -0700313 */
Xi Wanga8203722012-03-05 15:14:41 -0800314static inline void *kmalloc_array(size_t n, size_t size, gfp_t flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315{
Xi Wanga3860c12012-05-31 16:26:04 -0700316 if (size != 0 && n > SIZE_MAX / size)
Paul Mundt6193a2f2007-07-15 23:38:22 -0700317 return NULL;
Xi Wanga8203722012-03-05 15:14:41 -0800318 return __kmalloc(n * size, flags);
319}
320
321/**
322 * kcalloc - allocate memory for an array. The memory is set to zero.
323 * @n: number of elements.
324 * @size: element size.
325 * @flags: the type of memory to allocate (see kmalloc).
326 */
327static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
328{
329 return kmalloc_array(n, size, flags | __GFP_ZERO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330}
331
Paul Mundt6193a2f2007-07-15 23:38:22 -0700332#if !defined(CONFIG_NUMA) && !defined(CONFIG_SLOB)
333/**
334 * kmalloc_node - allocate memory from a specific node
335 * @size: how many bytes of memory are required.
336 * @flags: the type of memory to allocate (see kcalloc).
337 * @node: node to allocate from.
338 *
339 * kmalloc() for non-local nodes, used to allocate from a specific node
340 * if available. Equivalent to kmalloc() in the non-NUMA single-node
341 * case.
342 */
Christoph Lameter55935a32006-12-13 00:34:24 -0800343static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
344{
345 return kmalloc(size, flags);
346}
347
348static inline void *__kmalloc_node(size_t size, gfp_t flags, int node)
349{
350 return __kmalloc(size, flags);
351}
Paul Mundt6193a2f2007-07-15 23:38:22 -0700352
353void *kmem_cache_alloc(struct kmem_cache *, gfp_t);
354
355static inline void *kmem_cache_alloc_node(struct kmem_cache *cachep,
356 gfp_t flags, int node)
357{
358 return kmem_cache_alloc(cachep, flags);
359}
360#endif /* !CONFIG_NUMA && !CONFIG_SLOB */
Christoph Lameter55935a32006-12-13 00:34:24 -0800361
Christoph Hellwig1d2c8ee2006-10-04 02:15:25 -0700362/*
363 * kmalloc_track_caller is a special version of kmalloc that records the
364 * calling function of the routine calling it for slab leak tracking instead
365 * of just the calling function (confusing, eh?).
366 * It's useful when the call to kmalloc comes from a widely-used standard
367 * allocator where we care about the real place the memory allocation
368 * request comes from.
369 */
Xiaotian Feng7adde042010-06-30 17:57:22 +0800370#if defined(CONFIG_DEBUG_SLAB) || defined(CONFIG_SLUB) || \
Ezequiel Garciaf3f74102012-09-08 17:47:53 -0300371 (defined(CONFIG_SLAB) && defined(CONFIG_TRACING)) || \
372 (defined(CONFIG_SLOB) && defined(CONFIG_TRACING))
Eduard - Gabriel Munteanuce71e272008-08-19 20:43:25 +0300373extern void *__kmalloc_track_caller(size_t, gfp_t, unsigned long);
Christoph Hellwig1d2c8ee2006-10-04 02:15:25 -0700374#define kmalloc_track_caller(size, flags) \
Eduard - Gabriel Munteanuce71e272008-08-19 20:43:25 +0300375 __kmalloc_track_caller(size, flags, _RET_IP_)
Christoph Lameter2e892f42006-12-13 00:34:23 -0800376#else
377#define kmalloc_track_caller(size, flags) \
378 __kmalloc(size, flags)
379#endif /* DEBUG_SLAB */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380
Manfred Spraul97e2bde2005-05-01 08:58:38 -0700381#ifdef CONFIG_NUMA
Christoph Hellwig8b98c162006-12-06 20:32:30 -0800382/*
383 * kmalloc_node_track_caller is a special version of kmalloc_node that
384 * records the calling function of the routine calling it for slab leak
385 * tracking instead of just the calling function (confusing, eh?).
386 * It's useful when the call to kmalloc_node comes from a widely-used
387 * standard allocator where we care about the real place the memory
388 * allocation request comes from.
389 */
Xiaotian Feng7adde042010-06-30 17:57:22 +0800390#if defined(CONFIG_DEBUG_SLAB) || defined(CONFIG_SLUB) || \
Ezequiel Garciaf3f74102012-09-08 17:47:53 -0300391 (defined(CONFIG_SLAB) && defined(CONFIG_TRACING)) || \
392 (defined(CONFIG_SLOB) && defined(CONFIG_TRACING))
Eduard - Gabriel Munteanuce71e272008-08-19 20:43:25 +0300393extern void *__kmalloc_node_track_caller(size_t, gfp_t, int, unsigned long);
Christoph Hellwig8b98c162006-12-06 20:32:30 -0800394#define kmalloc_node_track_caller(size, flags, node) \
395 __kmalloc_node_track_caller(size, flags, node, \
Eduard - Gabriel Munteanuce71e272008-08-19 20:43:25 +0300396 _RET_IP_)
Christoph Lameter2e892f42006-12-13 00:34:23 -0800397#else
398#define kmalloc_node_track_caller(size, flags, node) \
399 __kmalloc_node(size, flags, node)
Christoph Hellwig8b98c162006-12-06 20:32:30 -0800400#endif
Christoph Lameter2e892f42006-12-13 00:34:23 -0800401
Christoph Hellwig8b98c162006-12-06 20:32:30 -0800402#else /* CONFIG_NUMA */
Christoph Lameter2e892f42006-12-13 00:34:23 -0800403
404#define kmalloc_node_track_caller(size, flags, node) \
405 kmalloc_track_caller(size, flags)
406
Pascal Terjandfcd3612008-11-25 15:08:19 +0100407#endif /* CONFIG_NUMA */
Christoph Hellwig8b98c162006-12-06 20:32:30 -0800408
Christoph Lameter81cda662007-07-17 04:03:29 -0700409/*
410 * Shortcuts
411 */
412static inline void *kmem_cache_zalloc(struct kmem_cache *k, gfp_t flags)
413{
414 return kmem_cache_alloc(k, flags | __GFP_ZERO);
415}
416
417/**
418 * kzalloc - allocate memory. The memory is set to zero.
419 * @size: how many bytes of memory are required.
420 * @flags: the type of memory to allocate (see kmalloc).
421 */
422static inline void *kzalloc(size_t size, gfp_t flags)
423{
424 return kmalloc(size, flags | __GFP_ZERO);
425}
426
Jeff Layton979b0fe2008-06-05 22:47:00 -0700427/**
428 * kzalloc_node - allocate zeroed memory from a particular memory node.
429 * @size: how many bytes of memory are required.
430 * @flags: the type of memory to allocate (see kmalloc).
431 * @node: memory node from which to allocate
432 */
433static inline void *kzalloc_node(size_t size, gfp_t flags, int node)
434{
435 return kmalloc_node(size, flags | __GFP_ZERO, node);
436}
437
Ezequiel Garcia242860a2012-10-19 09:33:12 -0300438/*
439 * Determine the size of a slab object
440 */
441static inline unsigned int kmem_cache_size(struct kmem_cache *s)
442{
443 return s->object_size;
444}
445
Pekka Enberg7e85ee02009-06-12 14:03:06 +0300446void __init kmem_cache_init_late(void);
447
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448#endif /* _LINUX_SLAB_H */