]>
git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - mm/slab_common.c
2 * Slab allocator functions that are independent of the allocator strategy
4 * (C) 2012 Christoph Lameter <cl@linux.com>
6 #include <linux/slab.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>
22 enum slab_state slab_state
;
23 LIST_HEAD(slab_caches
);
24 DEFINE_MUTEX(slab_mutex
);
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.
32 * @ctor: A constructor for the objects.
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.
40 * %SLAB_POISON - Poison the slab with a known test pattern (a5a5a5a5)
41 * to catch references to uninitialised memory.
43 * %SLAB_RED_ZONE - Insert `Red' zones around the allocated memory to check
44 * for buffer overruns.
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
51 struct kmem_cache
*kmem_cache_create(const char *name
, size_t size
, size_t align
,
52 unsigned long flags
, void (*ctor
)(void *))
54 struct kmem_cache
*s
= NULL
;
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"
66 mutex_lock(&slab_mutex
);
68 #ifdef CONFIG_DEBUG_VM
69 list_for_each_entry(s
, &slab_caches
, list
) {
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.
78 res
= probe_kernel_address(s
->name
, tmp
);
81 "Slab cache with size %d has lost its name\n",
86 if (!strcmp(s
->name
, name
)) {
87 printk(KERN_ERR
"kmem_cache_create(%s): Cache name"
96 WARN_ON(strchr(name
, ' ')); /* It confuses parsers */
99 s
= __kmem_cache_create(name
, size
, align
, flags
, ctor
);
101 #ifdef CONFIG_DEBUG_VM
104 mutex_unlock(&slab_mutex
);
107 #ifdef CONFIG_DEBUG_VM
110 if (!s
&& (flags
& SLAB_PANIC
))
111 panic("kmem_cache_create: Failed to create slab '%s'\n", name
);
115 EXPORT_SYMBOL(kmem_cache_create
);
117 int slab_is_available(void)
119 return slab_state
>= UP
;