include/linux/slab.h - kernel/msm-4.9 - Gitiles

 /*
  * linux/mm/slab.h
  * Written by Mark Hemment, 1996.
  * (markhe@nextd.demon.co.uk)
  */

 #ifndef _LINUX_SLAB_H
 #define	_LINUX_SLAB_H

 #if	defined(__KERNEL__)

 typedef struct kmem_cache kmem_cache_t;

 #include	<linux/gfp.h>
 #include	<linux/init.h>
 #include	<linux/types.h>
 #include	<asm/page.h>		/* kmalloc_sizes.h needs PAGE_SIZE */
 #include	<asm/cache.h>		/* kmalloc_sizes.h needs L1_CACHE_BYTES */

 /* flags for kmem_cache_alloc() */
 #define	SLAB_NOFS		GFP_NOFS
 #define	SLAB_NOIO		GFP_NOIO
 #define	SLAB_ATOMIC		GFP_ATOMIC
 #define	SLAB_USER		GFP_USER
 #define	SLAB_KERNEL		GFP_KERNEL
 #define	SLAB_DMA		GFP_DMA

 #define SLAB_LEVEL_MASK		GFP_LEVEL_MASK

 #define	SLAB_NO_GROW		__GFP_NO_GROW	/* don't grow a cache */

 /* flags to pass to kmem_cache_create().
  * The first 3 are only valid when the allocator as been build
  * SLAB_DEBUG_SUPPORT.
  */
 #define	SLAB_DEBUG_FREE		0x00000100UL	/* Peform (expensive) checks on free */
 #define	SLAB_DEBUG_INITIAL	0x00000200UL	/* Call constructor (as verifier) */
 #define	SLAB_RED_ZONE		0x00000400UL	/* Red zone objs in a cache */
 #define	SLAB_POISON		0x00000800UL	/* Poison objects */
 #define	SLAB_HWCACHE_ALIGN	0x00002000UL	/* align objs on a h/w cache lines */
 #define SLAB_CACHE_DMA		0x00004000UL	/* use GFP_DMA memory */
 #define SLAB_MUST_HWCACHE_ALIGN	0x00008000UL	/* force alignment */
 #define SLAB_STORE_USER		0x00010000UL	/* store the last owner for bug hunting */
 #define SLAB_RECLAIM_ACCOUNT	0x00020000UL	/* track pages allocated to indicate
 						   what is reclaimable later*/
 #define SLAB_PANIC		0x00040000UL	/* panic if kmem_cache_create() fails */
 #define SLAB_DESTROY_BY_RCU	0x00080000UL	/* defer freeing pages to RCU */
 #define SLAB_MEM_SPREAD		0x00100000UL	/* Spread some memory over cpuset */

 /* flags passed to a constructor func */
 #define	SLAB_CTOR_CONSTRUCTOR	0x001UL		/* if not set, then deconstructor */
 #define SLAB_CTOR_ATOMIC	0x002UL		/* tell constructor it can't sleep */
 #define	SLAB_CTOR_VERIFY	0x004UL		/* tell constructor it's a verify call */

 #ifndef CONFIG_SLOB

 /* prototypes */
 extern void __init kmem_cache_init(void);

 extern kmem_cache_t *kmem_cache_create(const char *, size_t, size_t, unsigned long,
 				       void (*)(void *, kmem_cache_t *, unsigned long),
 				       void (*)(void *, kmem_cache_t *, unsigned long));
 extern int kmem_cache_destroy(kmem_cache_t *);
 extern int kmem_cache_shrink(kmem_cache_t *);
 extern void *kmem_cache_alloc(kmem_cache_t *, gfp_t);
 extern void *kmem_cache_zalloc(struct kmem_cache *, gfp_t);
 extern void kmem_cache_free(kmem_cache_t *, void *);
 extern unsigned int kmem_cache_size(kmem_cache_t *);
 extern const char *kmem_cache_name(kmem_cache_t *);
 extern kmem_cache_t *kmem_find_general_cachep(size_t size, gfp_t gfpflags);

 /* Size description struct for general caches. */
 struct cache_sizes {
 	size_t		 cs_size;
 	kmem_cache_t	*cs_cachep;
 	kmem_cache_t	*cs_dmacachep;
 };
 extern struct cache_sizes malloc_sizes[];

 extern void *__kmalloc(size_t, gfp_t);
 #ifndef CONFIG_DEBUG_SLAB
 #define ____kmalloc(size, flags) __kmalloc(size, flags)
 #else
 extern void *__kmalloc_track_caller(size_t, gfp_t, void*);
 #define ____kmalloc(size, flags) \
     __kmalloc_track_caller(size, flags, __builtin_return_address(0))
 #endif

 /**
  * kmalloc - allocate memory
  * @size: how many bytes of memory are required.
  * @flags: the type of memory to allocate.
  *
  * kmalloc is the normal method of allocating memory
  * in the kernel.
  *
  * The @flags argument may be one of:
  *
  * %GFP_USER - Allocate memory on behalf of user.  May sleep.
  *
  * %GFP_KERNEL - Allocate normal kernel ram.  May sleep.
  *
  * %GFP_ATOMIC - Allocation will not sleep.
  *   For example, use this inside interrupt handlers.
  *
  * %GFP_HIGHUSER - Allocate pages from high memory.
  *
  * %GFP_NOIO - Do not do any I/O at all while trying to get memory.
  *
  * %GFP_NOFS - Do not make any fs calls while trying to get memory.
  *
  * Also it is possible to set different flags by OR'ing
  * in one or more of the following additional @flags:
  *
  * %__GFP_COLD - Request cache-cold pages instead of
  *   trying to return cache-warm pages.
  *
  * %__GFP_DMA - Request memory from the DMA-capable zone.
  *
  * %__GFP_HIGH - This allocation has high priority and may use emergency pools.
  *
  * %__GFP_HIGHMEM - Allocated memory may be from highmem.
  *
  * %__GFP_NOFAIL - Indicate that this allocation is in no way allowed to fail
  *   (think twice before using).
  *
  * %__GFP_NORETRY - If memory is not immediately available,
  *   then give up at once.
  *
  * %__GFP_NOWARN - If allocation fails, don't issue any warnings.
  *
  * %__GFP_REPEAT - If allocation fails initially, try once more before failing.
  */
 static inline void *kmalloc(size_t size, gfp_t flags)
 {
 	if (__builtin_constant_p(size)) {
 		int i = 0;
 #define CACHE(x) \
 		if (size <= x) \
 			goto found; \
 		else \
 			i++;
 #include "kmalloc_sizes.h"
 #undef CACHE
 		{
 			extern void __you_cannot_kmalloc_that_much(void);
 			__you_cannot_kmalloc_that_much();
 		}
 found:
 		return kmem_cache_alloc((flags & GFP_DMA) ?
 			malloc_sizes[i].cs_dmacachep :
 			malloc_sizes[i].cs_cachep, flags);
 	}
 	return __kmalloc(size, flags);
 }

 extern void *__kzalloc(size_t, gfp_t);

 /**
  * kzalloc - allocate memory. The memory is set to zero.
  * @size: how many bytes of memory are required.
  * @flags: the type of memory to allocate (see kmalloc).
  */
 static inline void *kzalloc(size_t size, gfp_t flags)
 {
 	if (__builtin_constant_p(size)) {
 		int i = 0;
 #define CACHE(x) \
 		if (size <= x) \
 			goto found; \
 		else \
 			i++;
 #include "kmalloc_sizes.h"
 #undef CACHE
 		{
 			extern void __you_cannot_kzalloc_that_much(void);
 			__you_cannot_kzalloc_that_much();
 		}
 found:
 		return kmem_cache_zalloc((flags & GFP_DMA) ?
 			malloc_sizes[i].cs_dmacachep :
 			malloc_sizes[i].cs_cachep, flags);
 	}
 	return __kzalloc(size, flags);
 }

 /**
  * kcalloc - allocate memory for an array. The memory is set to zero.
  * @n: number of elements.
  * @size: element size.
  * @flags: the type of memory to allocate.
  */
 static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
 {
 	if (n != 0 && size > ULONG_MAX / n)
 		return NULL;
 	return kzalloc(n * size, flags);
 }

 extern void kfree(const void *);
 extern unsigned int ksize(const void *);
 extern int slab_is_available(void);

 #ifdef CONFIG_NUMA
 extern void *kmem_cache_alloc_node(kmem_cache_t *, gfp_t flags, int node);
 extern void *kmalloc_node(size_t size, gfp_t flags, int node);
 #else
 static inline void *kmem_cache_alloc_node(kmem_cache_t *cachep, gfp_t flags, int node)
 {
 	return kmem_cache_alloc(cachep, flags);
 }
 static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
 {
 	return kmalloc(size, flags);
 }
 #endif

 extern int FASTCALL(kmem_cache_reap(int));
 extern int FASTCALL(kmem_ptr_validate(kmem_cache_t *cachep, void *ptr));

 #else /* CONFIG_SLOB */

 /* SLOB allocator routines */

 void kmem_cache_init(void);
 struct kmem_cache *kmem_find_general_cachep(size_t, gfp_t gfpflags);
 struct kmem_cache *kmem_cache_create(const char *c, size_t, size_t,
 	unsigned long,
 	void (*)(void *, struct kmem_cache *, unsigned long),
 	void (*)(void *, struct kmem_cache *, unsigned long));
 int kmem_cache_destroy(struct kmem_cache *c);
 void *kmem_cache_alloc(struct kmem_cache *c, gfp_t flags);
 void *kmem_cache_zalloc(struct kmem_cache *, gfp_t);
 void kmem_cache_free(struct kmem_cache *c, void *b);
 const char *kmem_cache_name(struct kmem_cache *);
 void *kmalloc(size_t size, gfp_t flags);
 void *__kzalloc(size_t size, gfp_t flags);
 void kfree(const void *m);
 unsigned int ksize(const void *m);
 unsigned int kmem_cache_size(struct kmem_cache *c);

 static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
 {
 	return __kzalloc(n * size, flags);
 }

 #define kmem_cache_shrink(d) (0)
 #define kmem_cache_reap(a)
 #define kmem_ptr_validate(a, b) (0)
 #define kmem_cache_alloc_node(c, f, n) kmem_cache_alloc(c, f)
 #define kmalloc_node(s, f, n) kmalloc(s, f)
 #define kzalloc(s, f) __kzalloc(s, f)
 #define ____kmalloc kmalloc

 #endif /* CONFIG_SLOB */

 /* System wide caches */
 extern kmem_cache_t	*vm_area_cachep;
 extern kmem_cache_t	*names_cachep;
 extern kmem_cache_t	*files_cachep;
 extern kmem_cache_t	*filp_cachep;
 extern kmem_cache_t	*fs_cachep;
 extern kmem_cache_t	*sighand_cachep;
 extern kmem_cache_t	*bio_cachep;

 extern atomic_t slab_reclaim_pages;

 #endif	/* __KERNEL__ */

 #endif	/* _LINUX_SLAB_H */
	/*
	* linux/mm/slab.h
	* Written by Mark Hemment, 1996.
	* (markhe@nextd.demon.co.uk)
	*/

	#ifndef _LINUX_SLAB_H
	#define _LINUX_SLAB_H

	#if defined(__KERNEL__)

	typedef struct kmem_cache kmem_cache_t;

	#include <linux/gfp.h>
	#include <linux/init.h>
	#include <linux/types.h>
	#include <asm/page.h> /* kmalloc_sizes.h needs PAGE_SIZE */
	#include <asm/cache.h> /* kmalloc_sizes.h needs L1_CACHE_BYTES */

	/* flags for kmem_cache_alloc() */
	#define SLAB_NOFS GFP_NOFS
	#define SLAB_NOIO GFP_NOIO
	#define SLAB_ATOMIC GFP_ATOMIC
	#define SLAB_USER GFP_USER
	#define SLAB_KERNEL GFP_KERNEL
	#define SLAB_DMA GFP_DMA

	#define SLAB_LEVEL_MASK GFP_LEVEL_MASK

	#define SLAB_NO_GROW __GFP_NO_GROW /* don't grow a cache */

	/* flags to pass to kmem_cache_create().
	* The first 3 are only valid when the allocator as been build
	* SLAB_DEBUG_SUPPORT.
	*/
	#define SLAB_DEBUG_FREE 0x00000100UL /* Peform (expensive) checks on free */
	#define SLAB_DEBUG_INITIAL 0x00000200UL /* Call constructor (as verifier) */
	#define SLAB_RED_ZONE 0x00000400UL /* Red zone objs in a cache */
	#define SLAB_POISON 0x00000800UL /* Poison objects */
	#define SLAB_HWCACHE_ALIGN 0x00002000UL /* align objs on a h/w cache lines */
	#define SLAB_CACHE_DMA 0x00004000UL /* use GFP_DMA memory */
	#define SLAB_MUST_HWCACHE_ALIGN 0x00008000UL /* force alignment */
	#define SLAB_STORE_USER 0x00010000UL /* store the last owner for bug hunting */
	#define SLAB_RECLAIM_ACCOUNT 0x00020000UL /* track pages allocated to indicate
	what is reclaimable later*/
	#define SLAB_PANIC 0x00040000UL /* panic if kmem_cache_create() fails */
	#define SLAB_DESTROY_BY_RCU 0x00080000UL /* defer freeing pages to RCU */
	#define SLAB_MEM_SPREAD 0x00100000UL /* Spread some memory over cpuset */

	/* flags passed to a constructor func */
	#define SLAB_CTOR_CONSTRUCTOR 0x001UL /* if not set, then deconstructor */
	#define SLAB_CTOR_ATOMIC 0x002UL /* tell constructor it can't sleep */
	#define SLAB_CTOR_VERIFY 0x004UL /* tell constructor it's a verify call */

	#ifndef CONFIG_SLOB

	/* prototypes */
	extern void __init kmem_cache_init(void);

	extern kmem_cache_t kmem_cache_create(const char , size_t, size_t, unsigned long,
	void ()(void , kmem_cache_t *, unsigned long),
	void ()(void , kmem_cache_t *, unsigned long));
	extern int kmem_cache_destroy(kmem_cache_t *);
	extern int kmem_cache_shrink(kmem_cache_t *);
	extern void kmem_cache_alloc(kmem_cache_t , gfp_t);
	extern void kmem_cache_zalloc(struct kmem_cache , gfp_t);
	extern void kmem_cache_free(kmem_cache_t , void );
	extern unsigned int kmem_cache_size(kmem_cache_t *);
	extern const char kmem_cache_name(kmem_cache_t );
	extern kmem_cache_t *kmem_find_general_cachep(size_t size, gfp_t gfpflags);

	/* Size description struct for general caches. */
	struct cache_sizes {
	size_t cs_size;
	kmem_cache_t *cs_cachep;
	kmem_cache_t *cs_dmacachep;
	};
	extern struct cache_sizes malloc_sizes[];

	extern void *__kmalloc(size_t, gfp_t);
	#ifndef CONFIG_DEBUG_SLAB
	#define ____kmalloc(size, flags) __kmalloc(size, flags)
	#else
	extern void __kmalloc_track_caller(size_t, gfp_t, void);
	#define ____kmalloc(size, flags) \
	__kmalloc_track_caller(size, flags, __builtin_return_address(0))
	#endif

	/**
	* kmalloc - allocate memory
	* @size: how many bytes of memory are required.
	* @flags: the type of memory to allocate.
	*
	* kmalloc is the normal method of allocating memory
	* in the kernel.
	*
	* The @flags argument may be one of:
	*
	* %GFP_USER - Allocate memory on behalf of user. May sleep.
	*
	* %GFP_KERNEL - Allocate normal kernel ram. May sleep.
	*
	* %GFP_ATOMIC - Allocation will not sleep.
	* For example, use this inside interrupt handlers.
	*
	* %GFP_HIGHUSER - Allocate pages from high memory.
	*
	* %GFP_NOIO - Do not do any I/O at all while trying to get memory.
	*
	* %GFP_NOFS - Do not make any fs calls while trying to get memory.
	*
	* Also it is possible to set different flags by OR'ing
	* in one or more of the following additional @flags:
	*
	* %__GFP_COLD - Request cache-cold pages instead of
	* trying to return cache-warm pages.
	*
	* %__GFP_DMA - Request memory from the DMA-capable zone.
	*
	* %__GFP_HIGH - This allocation has high priority and may use emergency pools.
	*
	* %__GFP_HIGHMEM - Allocated memory may be from highmem.
	*
	* %__GFP_NOFAIL - Indicate that this allocation is in no way allowed to fail
	* (think twice before using).
	*
	* %__GFP_NORETRY - If memory is not immediately available,
	* then give up at once.
	*
	* %__GFP_NOWARN - If allocation fails, don't issue any warnings.
	*
	* %__GFP_REPEAT - If allocation fails initially, try once more before failing.
	*/
	static inline void *kmalloc(size_t size, gfp_t flags)
	{
	if (__builtin_constant_p(size)) {
	int i = 0;
	#define CACHE(x) \
	if (size <= x) \
	goto found; \
	else \
	i++;
	#include "kmalloc_sizes.h"
	#undef CACHE
	{
	extern void __you_cannot_kmalloc_that_much(void);
	__you_cannot_kmalloc_that_much();
	}
	found:
	return kmem_cache_alloc((flags & GFP_DMA) ?
	malloc_sizes[i].cs_dmacachep :
	malloc_sizes[i].cs_cachep, flags);
	}
	return __kmalloc(size, flags);
	}

	extern void *__kzalloc(size_t, gfp_t);

	/**
	* kzalloc - allocate memory. The memory is set to zero.
	* @size: how many bytes of memory are required.
	* @flags: the type of memory to allocate (see kmalloc).
	*/
	static inline void *kzalloc(size_t size, gfp_t flags)
	{
	if (__builtin_constant_p(size)) {
	int i = 0;
	#define CACHE(x) \
	if (size <= x) \
	goto found; \
	else \
	i++;
	#include "kmalloc_sizes.h"
	#undef CACHE
	{
	extern void __you_cannot_kzalloc_that_much(void);
	__you_cannot_kzalloc_that_much();
	}
	found:
	return kmem_cache_zalloc((flags & GFP_DMA) ?
	malloc_sizes[i].cs_dmacachep :
	malloc_sizes[i].cs_cachep, flags);
	}
	return __kzalloc(size, flags);
	}

	/**
	* kcalloc - allocate memory for an array. The memory is set to zero.
	* @n: number of elements.
	* @size: element size.
	* @flags: the type of memory to allocate.
	*/
	static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
	{
	if (n != 0 && size > ULONG_MAX / n)
	return NULL;
	return kzalloc(n * size, flags);
	}

	extern void kfree(const void *);
	extern unsigned int ksize(const void *);
	extern int slab_is_available(void);

	#ifdef CONFIG_NUMA
	extern void kmem_cache_alloc_node(kmem_cache_t , gfp_t flags, int node);
	extern void *kmalloc_node(size_t size, gfp_t flags, int node);
	#else
	static inline void kmem_cache_alloc_node(kmem_cache_t cachep, gfp_t flags, int node)
	{
	return kmem_cache_alloc(cachep, flags);
	}
	static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
	{
	return kmalloc(size, flags);
	}
	#endif

	extern int FASTCALL(kmem_cache_reap(int));
	extern int FASTCALL(kmem_ptr_validate(kmem_cache_t cachep, void ptr));

	#else /* CONFIG_SLOB */

	/* SLOB allocator routines */

	void kmem_cache_init(void);
	struct kmem_cache *kmem_find_general_cachep(size_t, gfp_t gfpflags);
	struct kmem_cache kmem_cache_create(const char c, size_t, size_t,
	unsigned long,
	void ()(void , struct kmem_cache *, unsigned long),
	void ()(void , struct kmem_cache *, unsigned long));
	int kmem_cache_destroy(struct kmem_cache *c);
	void kmem_cache_alloc(struct kmem_cache c, gfp_t flags);
	void kmem_cache_zalloc(struct kmem_cache , gfp_t);
	void kmem_cache_free(struct kmem_cache c, void b);
	const char kmem_cache_name(struct kmem_cache );
	void *kmalloc(size_t size, gfp_t flags);
	void *__kzalloc(size_t size, gfp_t flags);
	void kfree(const void *m);
	unsigned int ksize(const void *m);
	unsigned int kmem_cache_size(struct kmem_cache *c);

	static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
	{
	return __kzalloc(n * size, flags);
	}

	#define kmem_cache_shrink(d) (0)
	#define kmem_cache_reap(a)
	#define kmem_ptr_validate(a, b) (0)
	#define kmem_cache_alloc_node(c, f, n) kmem_cache_alloc(c, f)
	#define kmalloc_node(s, f, n) kmalloc(s, f)
	#define kzalloc(s, f) __kzalloc(s, f)
	#define ____kmalloc kmalloc

	#endif /* CONFIG_SLOB */

	/* System wide caches */
	extern kmem_cache_t *vm_area_cachep;
	extern kmem_cache_t *names_cachep;
	extern kmem_cache_t *files_cachep;
	extern kmem_cache_t *filp_cachep;
	extern kmem_cache_t *fs_cachep;
	extern kmem_cache_t *sighand_cachep;
	extern kmem_cache_t *bio_cachep;

	extern atomic_t slab_reclaim_pages;

	#endif /* __KERNEL__ */

	#endif /* _LINUX_SLAB_H */