mm/sl[aou]b: Extract a common function for kmem_cache_destroy

kmem_cache_destroy does basically the same in all allocators.

Extract common code which is easy since we already have common mutex
handling.

Reviewed-by: Glauber Costa <glommer@parallels.com>
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>

1 files changed, 25 insertions, 0 deletions

diff --git a/mm/slab_common.c b/mm/slab_common.c
index 5190a7cd02bd..a1c4f0b5aaed 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -140,6 +140,31 @@ out_locked:
 }
 EXPORT_SYMBOL(kmem_cache_create);
 
+void kmem_cache_destroy(struct kmem_cache *s)
+{
+        get_online_cpus();
+        mutex_lock(&slab_mutex);
+        s->refcount--;
+        if (!s->refcount) {
+                list_del(&s->list);
+
+                if (!__kmem_cache_shutdown(s)) {
+                        if (s->flags & SLAB_DESTROY_BY_RCU)
+                                rcu_barrier();
+
+                        __kmem_cache_destroy(s);
+                } else {
+                        list_add(&s->list, &slab_caches);
+                        printk(KERN_ERR "kmem_cache_destroy %s: Slab cache still has objects\n",
+                                s->name);
+                        dump_stack();
+                }
+        }
+        mutex_unlock(&slab_mutex);
+        put_online_cpus();
+}
+EXPORT_SYMBOL(kmem_cache_destroy);
+
 int slab_is_available(void)
 {
         return slab_state >= UP;