224 lines
7.1 KiB
C
224 lines
7.1 KiB
C
/*
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* Written by Mark Hemment, 1996 (markhe@nextd.demon.co.uk).
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*
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* (C) SGI 2006, Christoph Lameter <clameter@sgi.com>
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* Cleaned up and restructured to ease the addition of alternative
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* implementations of SLAB allocators.
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*/
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#ifndef _LINUX_SLAB_H
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#define _LINUX_SLAB_H
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#ifdef __KERNEL__
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#include <linux/gfp.h>
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#include <linux/types.h>
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typedef struct kmem_cache kmem_cache_t __deprecated;
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/*
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* Flags to pass to kmem_cache_create().
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* The ones marked DEBUG are only valid if CONFIG_SLAB_DEBUG is set.
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*/
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#define SLAB_DEBUG_FREE 0x00000100UL /* DEBUG: Perform (expensive) checks on free */
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#define SLAB_DEBUG_INITIAL 0x00000200UL /* DEBUG: Call constructor (as verifier) */
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#define SLAB_RED_ZONE 0x00000400UL /* DEBUG: Red zone objs in a cache */
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#define SLAB_POISON 0x00000800UL /* DEBUG: Poison objects */
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#define SLAB_HWCACHE_ALIGN 0x00002000UL /* Align objs on cache lines */
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#define SLAB_CACHE_DMA 0x00004000UL /* Use GFP_DMA memory */
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#define SLAB_MUST_HWCACHE_ALIGN 0x00008000UL /* Force alignment even if debuggin is active */
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#define SLAB_STORE_USER 0x00010000UL /* DEBUG: Store the last owner for bug hunting */
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#define SLAB_RECLAIM_ACCOUNT 0x00020000UL /* Objects are reclaimable */
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#define SLAB_PANIC 0x00040000UL /* Panic if kmem_cache_create() fails */
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#define SLAB_DESTROY_BY_RCU 0x00080000UL /* Defer freeing slabs to RCU */
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#define SLAB_MEM_SPREAD 0x00100000UL /* Spread some memory over cpuset */
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/* Flags passed to a constructor functions */
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#define SLAB_CTOR_CONSTRUCTOR 0x001UL /* If not set, then deconstructor */
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#define SLAB_CTOR_ATOMIC 0x002UL /* Tell constructor it can't sleep */
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#define SLAB_CTOR_VERIFY 0x004UL /* Tell constructor it's a verify call */
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/*
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* struct kmem_cache related prototypes
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*/
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void __init kmem_cache_init(void);
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extern int slab_is_available(void);
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struct kmem_cache *kmem_cache_create(const char *, size_t, size_t,
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unsigned long,
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void (*)(void *, struct kmem_cache *, unsigned long),
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void (*)(void *, struct kmem_cache *, unsigned long));
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void kmem_cache_destroy(struct kmem_cache *);
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int kmem_cache_shrink(struct kmem_cache *);
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void *kmem_cache_alloc(struct kmem_cache *, gfp_t);
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void *kmem_cache_zalloc(struct kmem_cache *, gfp_t);
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void kmem_cache_free(struct kmem_cache *, void *);
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unsigned int kmem_cache_size(struct kmem_cache *);
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const char *kmem_cache_name(struct kmem_cache *);
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int kmem_ptr_validate(struct kmem_cache *cachep, const void *ptr);
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#ifdef CONFIG_NUMA
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extern void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node);
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#else
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static inline void *kmem_cache_alloc_node(struct kmem_cache *cachep,
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gfp_t flags, int node)
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{
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return kmem_cache_alloc(cachep, flags);
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}
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#endif
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/*
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* Common kmalloc functions provided by all allocators
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*/
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void *__kmalloc(size_t, gfp_t);
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void *__kzalloc(size_t, gfp_t);
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void kfree(const void *);
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unsigned int ksize(const void *);
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/**
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* kcalloc - allocate memory for an array. The memory is set to zero.
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* @n: number of elements.
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* @size: element size.
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* @flags: the type of memory to allocate.
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*/
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static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
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{
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if (n != 0 && size > ULONG_MAX / n)
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return NULL;
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return __kzalloc(n * size, flags);
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}
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/*
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* Allocator specific definitions. These are mainly used to establish optimized
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* ways to convert kmalloc() calls to kmem_cache_alloc() invocations by selecting
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* the appropriate general cache at compile time.
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*/
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#ifdef CONFIG_SLAB
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#include <linux/slab_def.h>
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#else
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/*
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* Fallback definitions for an allocator not wanting to provide
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* its own optimized kmalloc definitions (like SLOB).
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*/
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/**
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* kmalloc - allocate memory
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* @size: how many bytes of memory are required.
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* @flags: the type of memory to allocate.
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*
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* kmalloc is the normal method of allocating memory
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* in the kernel.
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*
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* The @flags argument may be one of:
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*
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* %GFP_USER - Allocate memory on behalf of user. May sleep.
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*
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* %GFP_KERNEL - Allocate normal kernel ram. May sleep.
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*
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* %GFP_ATOMIC - Allocation will not sleep.
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* For example, use this inside interrupt handlers.
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*
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* %GFP_HIGHUSER - Allocate pages from high memory.
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*
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* %GFP_NOIO - Do not do any I/O at all while trying to get memory.
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*
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* %GFP_NOFS - Do not make any fs calls while trying to get memory.
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*
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* Also it is possible to set different flags by OR'ing
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* in one or more of the following additional @flags:
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*
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* %__GFP_COLD - Request cache-cold pages instead of
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* trying to return cache-warm pages.
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*
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* %__GFP_DMA - Request memory from the DMA-capable zone.
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*
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* %__GFP_HIGH - This allocation has high priority and may use emergency pools.
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*
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* %__GFP_HIGHMEM - Allocated memory may be from highmem.
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*
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* %__GFP_NOFAIL - Indicate that this allocation is in no way allowed to fail
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* (think twice before using).
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*
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* %__GFP_NORETRY - If memory is not immediately available,
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* then give up at once.
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*
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* %__GFP_NOWARN - If allocation fails, don't issue any warnings.
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*
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* %__GFP_REPEAT - If allocation fails initially, try once more before failing.
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*/
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static inline void *kmalloc(size_t size, gfp_t flags)
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{
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return __kmalloc(size, flags);
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}
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/**
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* kzalloc - allocate memory. The memory is set to zero.
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* @size: how many bytes of memory are required.
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* @flags: the type of memory to allocate (see kmalloc).
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*/
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static inline void *kzalloc(size_t size, gfp_t flags)
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{
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return __kzalloc(size, flags);
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}
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#endif
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#ifndef CONFIG_NUMA
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static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
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{
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return kmalloc(size, flags);
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}
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static inline void *__kmalloc_node(size_t size, gfp_t flags, int node)
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{
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return __kmalloc(size, flags);
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}
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#endif /* !CONFIG_NUMA */
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/*
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* kmalloc_track_caller is a special version of kmalloc that records the
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* calling function of the routine calling it for slab leak tracking instead
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* of just the calling function (confusing, eh?).
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* It's useful when the call to kmalloc comes from a widely-used standard
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* allocator where we care about the real place the memory allocation
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* request comes from.
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*/
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#ifdef CONFIG_DEBUG_SLAB
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extern void *__kmalloc_track_caller(size_t, gfp_t, void*);
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#define kmalloc_track_caller(size, flags) \
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__kmalloc_track_caller(size, flags, __builtin_return_address(0))
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#else
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#define kmalloc_track_caller(size, flags) \
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__kmalloc(size, flags)
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#endif /* DEBUG_SLAB */
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#ifdef CONFIG_NUMA
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/*
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* kmalloc_node_track_caller is a special version of kmalloc_node that
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* records the calling function of the routine calling it for slab leak
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* tracking instead of just the calling function (confusing, eh?).
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* It's useful when the call to kmalloc_node comes from a widely-used
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* standard allocator where we care about the real place the memory
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* allocation request comes from.
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*/
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#ifdef CONFIG_DEBUG_SLAB
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extern void *__kmalloc_node_track_caller(size_t, gfp_t, int, void *);
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#define kmalloc_node_track_caller(size, flags, node) \
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__kmalloc_node_track_caller(size, flags, node, \
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__builtin_return_address(0))
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#else
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#define kmalloc_node_track_caller(size, flags, node) \
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__kmalloc_node(size, flags, node)
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#endif
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#else /* CONFIG_NUMA */
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#define kmalloc_node_track_caller(size, flags, node) \
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kmalloc_track_caller(size, flags)
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#endif /* DEBUG_SLAB */
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#endif /* __KERNEL__ */
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#endif /* _LINUX_SLAB_H */
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