Christoph Lameter | 039363f | 2012-07-06 15:25:10 -0500 | [diff] [blame^] | 1 | /* |
| 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 | |
| 44 | struct 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 |
| 61 | out: |
| 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 | } |
| 68 | EXPORT_SYMBOL(kmem_cache_create); |