mm/slab_common.c

   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);