blob: 80412beb67cc30de4fe8dc4c35aa7b98fcd084dc [file] [log] [blame]
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
19/*
20 * kmem_cache_create - Create a cache.
21 * @name: A string which is used in /proc/slabinfo to identify this cache.
22 * @size: The size of objects to be created in this cache.
23 * @align: The required alignment for the objects.
24 * @flags: SLAB flags
25 * @ctor: A constructor for the objects.
26 *
27 * Returns a ptr to the cache on success, NULL on failure.
28 * Cannot be called within a interrupt, but can be interrupted.
29 * The @ctor is run when new pages are allocated by the cache.
30 *
31 * The flags are
32 *
33 * %SLAB_POISON - Poison the slab with a known test pattern (a5a5a5a5)
34 * to catch references to uninitialised memory.
35 *
36 * %SLAB_RED_ZONE - Insert `Red' zones around the allocated memory to check
37 * for buffer overruns.
38 *
39 * %SLAB_HWCACHE_ALIGN - Align the objects in this cache to a hardware
40 * cacheline. This can be beneficial if you're counting cycles as closely
41 * as davem.
42 */
43
44struct kmem_cache *kmem_cache_create(const char *name, size_t size, size_t align,
45 unsigned long flags, void (*ctor)(void *))
46{
47 struct kmem_cache *s = NULL;
48
49#ifdef CONFIG_DEBUG_VM
50 if (!name || in_interrupt() || size < sizeof(void *) ||
51 size > KMALLOC_MAX_SIZE) {
52 printk(KERN_ERR "kmem_cache_create(%s) integrity check"
53 " failed\n", name);
54 goto out;
55 }
56#endif
57
58 s = __kmem_cache_create(name, size, align, flags, ctor);
59
60#ifdef CONFIG_DEBUG_VM
61out:
62#endif
63 if (!s && (flags & SLAB_PANIC))
64 panic("kmem_cache_create: Failed to create slab '%s'\n", name);
65
66 return s;
67}
68EXPORT_SYMBOL(kmem_cache_create);