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| 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 | #include <linux/cpu.h> |
| 15 | #include <linux/uaccess.h> |
| 16 | #include <asm/cacheflush.h> |
| 17 | #include <asm/tlbflush.h> |
| 18 | #include <asm/page.h> |
| 19 | |
| 20 | #include "slab.h" |
| 21 | |
| 22 | enum slab_state slab_state; |
| 23 | LIST_HEAD(slab_caches); |
| 24 | DEFINE_MUTEX(slab_mutex); |
| 25 | |
| 26 | /* |
| 27 | * kmem_cache_create - Create a cache. |
| 28 | * @name: A string which is used in /proc/slabinfo to identify this cache. |
| 29 | * @size: The size of objects to be created in this cache. |
| 30 | * @align: The required alignment for the objects. |
| 31 | * @flags: SLAB flags |
| 32 | * @ctor: A constructor for the objects. |
| 33 | * |
| 34 | * Returns a ptr to the cache on success, NULL on failure. |
| 35 | * Cannot be called within a interrupt, but can be interrupted. |
| 36 | * The @ctor is run when new pages are allocated by the cache. |
| 37 | * |
| 38 | * The flags are |
| 39 | * |
| 40 | * %SLAB_POISON - Poison the slab with a known test pattern (a5a5a5a5) |
| 41 | * to catch references to uninitialised memory. |
| 42 | * |
| 43 | * %SLAB_RED_ZONE - Insert `Red' zones around the allocated memory to check |
| 44 | * for buffer overruns. |
| 45 | * |
| 46 | * %SLAB_HWCACHE_ALIGN - Align the objects in this cache to a hardware |
| 47 | * cacheline. This can be beneficial if you're counting cycles as closely |
| 48 | * as davem. |
| 49 | */ |
| 50 | |
| 51 | struct kmem_cache *kmem_cache_create(const char *name, size_t size, size_t align, |
| 52 | unsigned long flags, void (*ctor)(void *)) |
| 53 | { |
| 54 | struct kmem_cache *s = NULL; |
| 55 | |
| 56 | #ifdef CONFIG_DEBUG_VM |
| 57 | if (!name || in_interrupt() || size < sizeof(void *) || |
| 58 | size > KMALLOC_MAX_SIZE) { |
| 59 | printk(KERN_ERR "kmem_cache_create(%s) integrity check" |
| 60 | " failed\n", name); |
| 61 | goto out; |
| 62 | } |
| 63 | #endif |
| 64 | |
| 65 | get_online_cpus(); |
| 66 | mutex_lock(&slab_mutex); |
| 67 | |
| 68 | #ifdef CONFIG_DEBUG_VM |
| 69 | list_for_each_entry(s, &slab_caches, list) { |
| 70 | char tmp; |
| 71 | int res; |
| 72 | |
| 73 | /* |
| 74 | * This happens when the module gets unloaded and doesn't |
| 75 | * destroy its slab cache and no-one else reuses the vmalloc |
| 76 | * area of the module. Print a warning. |
| 77 | */ |
| 78 | res = probe_kernel_address(s->name, tmp); |
| 79 | if (res) { |
| 80 | printk(KERN_ERR |
| 81 | "Slab cache with size %d has lost its name\n", |
| 82 | s->object_size); |
| 83 | continue; |
| 84 | } |
| 85 | |
| 86 | if (!strcmp(s->name, name)) { |
| 87 | printk(KERN_ERR "kmem_cache_create(%s): Cache name" |
| 88 | " already exists.\n", |
| 89 | name); |
| 90 | dump_stack(); |
| 91 | s = NULL; |
| 92 | goto oops; |
| 93 | } |
| 94 | } |
| 95 | |
| 96 | WARN_ON(strchr(name, ' ')); /* It confuses parsers */ |
| 97 | #endif |
| 98 | |
| 99 | s = __kmem_cache_create(name, size, align, flags, ctor); |
| 100 | |
| 101 | #ifdef CONFIG_DEBUG_VM |
| 102 | oops: |
| 103 | #endif |
| 104 | mutex_unlock(&slab_mutex); |
| 105 | put_online_cpus(); |
| 106 | |
| 107 | #ifdef CONFIG_DEBUG_VM |
| 108 | out: |
| 109 | #endif |
| 110 | if (!s && (flags & SLAB_PANIC)) |
| 111 | panic("kmem_cache_create: Failed to create slab '%s'\n", name); |
| 112 | |
| 113 | return s; |
| 114 | } |
| 115 | EXPORT_SYMBOL(kmem_cache_create); |
| 116 | |
| 117 | int slab_is_available(void) |
| 118 | { |
| 119 | return slab_state >= UP; |
| 120 | } |
| 121 |
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Tags:
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v2.6.34-rc5
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