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Christoph Lameter039363f2012-07-06 15:25:10 -05001/*
2 * Slab allocator functions that are independent of the allocator strategy
3 *
4 * (C) 2012 Christoph Lameter <cl@linux.com>
5 */
6#include <linux/slab.h>
7
8#include <linux/mm.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>
14
15#include <asm/cacheflush.h>
16#include <asm/tlbflush.h>
17#include <asm/page.h>
18
Christoph Lameter97d06602012-07-06 15:25:11 -050019#include "slab.h"
20
21enum slab_state slab_state;
22
Christoph Lameter039363f2012-07-06 15:25:10 -050023/*
24 * kmem_cache_create - Create a cache.
25 * @name: A string which is used in /proc/slabinfo to identify this cache.
26 * @size: The size of objects to be created in this cache.
27 * @align: The required alignment for the objects.
28 * @flags: SLAB flags
29 * @ctor: A constructor for the objects.
30 *
31 * Returns a ptr to the cache on success, NULL on failure.
32 * Cannot be called within a interrupt, but can be interrupted.
33 * The @ctor is run when new pages are allocated by the cache.
34 *
35 * The flags are
36 *
37 * %SLAB_POISON - Poison the slab with a known test pattern (a5a5a5a5)
38 * to catch references to uninitialised memory.
39 *
40 * %SLAB_RED_ZONE - Insert `Red' zones around the allocated memory to check
41 * for buffer overruns.
42 *
43 * %SLAB_HWCACHE_ALIGN - Align the objects in this cache to a hardware
44 * cacheline. This can be beneficial if you're counting cycles as closely
45 * as davem.
46 */
47
48struct kmem_cache *kmem_cache_create(const char *name, size_t size, size_t align,
49 unsigned long flags, void (*ctor)(void *))
50{
51 struct kmem_cache *s = NULL;
52
53#ifdef CONFIG_DEBUG_VM
54 if (!name || in_interrupt() || size < sizeof(void *) ||
55 size > KMALLOC_MAX_SIZE) {
56 printk(KERN_ERR "kmem_cache_create(%s) integrity check"
57 " failed\n", name);
58 goto out;
59 }
60#endif
61
62 s = __kmem_cache_create(name, size, align, flags, ctor);
63
64#ifdef CONFIG_DEBUG_VM
65out:
66#endif
67 if (!s && (flags & SLAB_PANIC))
68 panic("kmem_cache_create: Failed to create slab '%s'\n", name);
69
70 return s;
71}
72EXPORT_SYMBOL(kmem_cache_create);
Christoph Lameter97d06602012-07-06 15:25:11 -050073
74int slab_is_available(void)
75{
76 return slab_state >= UP;
77}