slub: Allow removal of slab caches during boot

If a slab cache is removed before we have setup sysfs then simply skip over
the sysfs handling.

Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Roland Dreier <rdreier@cisco.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Christoph Lameter <cl@linux-foundation.org>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>

1 files changed, 7 insertions, 0 deletions

diff --git a/mm/slub.c b/mm/slub.c
index 8655be5b7404..b89a7c99b2fa 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -4507,6 +4507,13 @@ static int sysfs_slab_add(struct kmem_cache *s)
 
 static void sysfs_slab_remove(struct kmem_cache *s)
 {
+        if (slab_state < SYSFS)
+                /*
+                 * Sysfs has not been setup yet so no need to remove the
+                 * cache from sysfs.
+                 */
+                return;
+
         kobject_uevent(&s->kobj, KOBJ_REMOVE);
         kobject_del(&s->kobj);
         kobject_put(&s->kobj);