Simplify locking by moving the slab_add_sysfs after all locks
have been dropped. Eases the upcoming move to provide sysfs
support for all allocators.
Signed-off-by: Christoph Lameter <cl@xxxxxxxxx>
Index: linux-2.6/mm/slab.h
===================================================================
--- linux-2.6.orig/mm/slab.h 2012-08-03 09:04:19.558047765 -0500
+++ linux-2.6/mm/slab.h 2012-08-03 09:04:21.258077096 -0500
@@ -39,10 +39,13 @@ struct kmem_cache *__kmem_cache_create(c
#ifdef CONFIG_SLUB
struct kmem_cache *__kmem_cache_alias(const char *name, size_t size,
size_t align, unsigned long flags, void (*ctor)(void *));
+extern int sysfs_slab_add(struct kmem_cache *s);
#else
static inline struct kmem_cache *__kmem_cache_alias(const char *name, size_t size,
size_t align, unsigned long flags, void (*ctor)(void *))
{ return NULL; }
+static inline int sysfs_slab_add(struct kmem_cache *s) { return 0; }
+
#endif
Index: linux-2.6/mm/slab_common.c
===================================================================
--- linux-2.6.orig/mm/slab_common.c 2012-08-03 09:04:19.558047765 -0500
+++ linux-2.6/mm/slab_common.c 2012-08-03 09:04:21.258077096 -0500
@@ -140,6 +140,9 @@ out:
return NULL;
}
+ if (s->refcount == 1)
+ sysfs_slab_add(s);
+
return s;
}
EXPORT_SYMBOL(kmem_cache_create);
Index: linux-2.6/mm/slub.c
===================================================================
--- linux-2.6.orig/mm/slub.c 2012-08-03 09:04:19.562047834 -0500
+++ linux-2.6/mm/slub.c 2012-08-03 09:04:21.258077096 -0500
@@ -202,12 +202,10 @@ struct track {
enum track_item { TRACK_ALLOC, TRACK_FREE };
#ifdef CONFIG_SYSFS
-static int sysfs_slab_add(struct kmem_cache *);
static int sysfs_slab_alias(struct kmem_cache *, const char *);
static void sysfs_slab_remove(struct kmem_cache *);
#else
-static inline int sysfs_slab_add(struct kmem_cache *s) { return 0; }
static inline int sysfs_slab_alias(struct kmem_cache *s, const char *p)
{ return 0; }
static inline void sysfs_slab_remove(struct kmem_cache *s) { }
@@ -3948,16 +3946,7 @@ struct kmem_cache *__kmem_cache_create(c
if (s) {
if (kmem_cache_open(s, name,
size, align, flags, ctor)) {
- int r;
-
- mutex_unlock(&slab_mutex);
- r = sysfs_slab_add(s);
- mutex_lock(&slab_mutex);
-
- if (!r)
- return s;
-
- kmem_cache_close(s);
+ return s;
}
kmem_cache_free(kmem_cache, s);
}
@@ -5251,7 +5240,7 @@ static char *create_unique_id(struct kme
return name;
}
-static int sysfs_slab_add(struct kmem_cache *s)
+int sysfs_slab_add(struct kmem_cache *s)
{
int err;
const char *name;
--
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