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mm, sl[aou]b: Move kmem_cache_create mutex handling to common code

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Move the mutex handling into the common kmem_cache_create()
function.

Then we can also move more checks out of SLAB's kmem_cache_create()
into the common code.

Reviewed-by: Glauber Costa <glommer@parallels.com>
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
This commit is contained in:
Christoph Lameter 2012-07-06 15:25:13 -05:00 committed by Pekka Enberg
parent 18004c5d40
commit 20cea9683e
3 changed files with 54 additions and 67 deletions
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52
mm/slab.c
View file

@ -2228,55 +2228,10 @@ __kmem_cache_create (const char *name, size_t size, size_t align,
unsigned long flags, void (*ctor)(void *))
{
size_t left_over, slab_size, ralign;
struct kmem_cache *cachep = NULL, *pc;
struct kmem_cache *cachep = NULL;
gfp_t gfp;
/*
* Sanity checks... these are all serious usage bugs.
*/
if (!name || in_interrupt() || (size < BYTES_PER_WORD) ||
size > KMALLOC_MAX_SIZE) {
printk(KERN_ERR "%s: Early error in slab %s\n", __func__,
name);
BUG();
}
/*
* We use cache_chain_mutex to ensure a consistent view of
* cpu_online_mask as well. Please see cpuup_callback
*/
if (slab_is_available()) {
get_online_cpus();
mutex_lock(&slab_mutex);
}
list_for_each_entry(pc, &slab_caches, list) {
char tmp;
int res;
/*
* This happens when the module gets unloaded and doesn't
* destroy its slab cache and no-one else reuses the vmalloc
* area of the module. Print a warning.
*/
res = probe_kernel_address(pc->name, tmp);
if (res) {
printk(KERN_ERR
"SLAB: cache with size %d has lost its name\n",
pc->size);
continue;
}
if (!strcmp(pc->name, name)) {
printk(KERN_ERR
"kmem_cache_create: duplicate cache %s\n", name);
dump_stack();
goto oops;
}
}
#if DEBUG
WARN_ON(strchr(name, ' ')); /* It confuses parsers */
#if FORCED_DEBUG
/*
* Enable redzoning and last user accounting, except for caches with
@ -2495,11 +2450,6 @@ __kmem_cache_create (const char *name, size_t size, size_t align,
/* cache setup completed, link it into the list */
list_add(&cachep->list, &slab_caches);
oops:
if (slab_is_available()) {
mutex_unlock(&slab_mutex);
put_online_cpus();
}
return cachep;
}

41
mm/slab_common.c
View file

@ -11,7 +11,8 @@
#include <linux/memory.h>
#include <linux/compiler.h>
#include <linux/module.h>
#include <linux/cpu.h>
#include <linux/uaccess.h>
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
#include <asm/page.h>
@ -61,8 +62,46 @@ struct kmem_cache *kmem_cache_create(const char *name, size_t size, size_t align
}
#endif
get_online_cpus();
mutex_lock(&slab_mutex);
#ifdef CONFIG_DEBUG_VM
list_for_each_entry(s, &slab_caches, list) {
char tmp;
int res;
/*
* This happens when the module gets unloaded and doesn't
* destroy its slab cache and no-one else reuses the vmalloc
* area of the module. Print a warning.
*/
res = probe_kernel_address(s->name, tmp);
if (res) {
printk(KERN_ERR
"Slab cache with size %d has lost its name\n",
s->object_size);
continue;
}
if (!strcmp(s->name, name)) {
printk(KERN_ERR "kmem_cache_create(%s): Cache name"
" already exists.\n",
name);
dump_stack();
s = NULL;
goto oops;
}
}
WARN_ON(strchr(name, ' ')); /* It confuses parsers */
#endif
s = __kmem_cache_create(name, size, align, flags, ctor);
oops:
mutex_unlock(&slab_mutex);
put_online_cpus();
#ifdef CONFIG_DEBUG_VM
out:
#endif

28
mm/slub.c
View file

@ -3911,7 +3911,6 @@ struct kmem_cache *__kmem_cache_create(const char *name, size_t size,
struct kmem_cache *s;
char *n;
mutex_lock(&slab_mutex);
s = find_mergeable(size, align, flags, name, ctor);
if (s) {
s->refcount++;
@ -3924,37 +3923,36 @@ struct kmem_cache *__kmem_cache_create(const char *name, size_t size,
if (sysfs_slab_alias(s, name)) {
s->refcount--;
goto err;
return NULL;
}
mutex_unlock(&slab_mutex);
return s;
}
n = kstrdup(name, GFP_KERNEL);
if (!n)
goto err;
return NULL;
s = kmalloc(kmem_size, GFP_KERNEL);
if (s) {
if (kmem_cache_open(s, n,
size, align, flags, ctor)) {
int r;
list_add(&s->list, &slab_caches);
mutex_unlock(&slab_mutex);
if (sysfs_slab_add(s)) {
mutex_lock(&slab_mutex);
list_del(&s->list);
kfree(n);
kfree(s);
goto err;
}
return s;
r = sysfs_slab_add(s);
mutex_lock(&slab_mutex);
if (!r)
return s;
list_del(&s->list);
kmem_cache_close(s);
}
kfree(s);
}
kfree(n);
err:
mutex_unlock(&slab_mutex);
return s;
return NULL;
}
#ifdef CONFIG_SMP