2 * Slab allocator functions that are independent of the allocator strategy
4 * (C) 2012 Christoph Lameter <cl@linux.com>
6 #include <linux/slab.h>
9 #include <linux/poison.h>
10 #include <linux/interrupt.h>
11 #include <linux/memory.h>
12 #include <linux/compiler.h>
13 #include <linux/module.h>
15 #include <asm/cacheflush.h>
16 #include <asm/tlbflush.h>
21 enum slab_state slab_state
;
22 LIST_HEAD(slab_caches
);
23 DEFINE_MUTEX(slab_mutex
);
26 * kmem_cache_create - Create a cache.
27 * @name: A string which is used in /proc/slabinfo to identify this cache.
28 * @size: The size of objects to be created in this cache.
29 * @align: The required alignment for the objects.
31 * @ctor: A constructor for the objects.
33 * Returns a ptr to the cache on success, NULL on failure.
34 * Cannot be called within a interrupt, but can be interrupted.
35 * The @ctor is run when new pages are allocated by the cache.
39 * %SLAB_POISON - Poison the slab with a known test pattern (a5a5a5a5)
40 * to catch references to uninitialised memory.
42 * %SLAB_RED_ZONE - Insert `Red' zones around the allocated memory to check
43 * for buffer overruns.
45 * %SLAB_HWCACHE_ALIGN - Align the objects in this cache to a hardware
46 * cacheline. This can be beneficial if you're counting cycles as closely
50 struct kmem_cache
*kmem_cache_create(const char *name
, size_t size
, size_t align
,
51 unsigned long flags
, void (*ctor
)(void *))
53 struct kmem_cache
*s
= NULL
;
55 #ifdef CONFIG_DEBUG_VM
56 if (!name
|| in_interrupt() || size
< sizeof(void *) ||
57 size
> KMALLOC_MAX_SIZE
) {
58 printk(KERN_ERR
"kmem_cache_create(%s) integrity check"
64 s
= __kmem_cache_create(name
, size
, align
, flags
, ctor
);
66 #ifdef CONFIG_DEBUG_VM
69 if (!s
&& (flags
& SLAB_PANIC
))
70 panic("kmem_cache_create: Failed to create slab '%s'\n", name
);
74 EXPORT_SYMBOL(kmem_cache_create
);
76 int slab_is_available(void)
78 return slab_state
>= UP
;
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