slub: When allocating a new slab also prep the first object

We need to branch to the debug code for the first object if we allocate
a new slab otherwise the first object will be marked wrongly as inactive.

Tested-by: Rabin Vincent <rabin@rab.in>
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/mm/slub.c b/mm/slub.c
index 7836b45ea1fa..e842c19e67fb 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -2082,6 +2082,9 @@ new_slab:
                 stat(s, ALLOC_SLAB);
                 c->node = page_to_nid(page);
                 c->page = page;
+
+                if (kmem_cache_debug(s))
+                        goto debug;
                 goto load_freelist;
         }
         if (!(gfpflags & __GFP_NOWARN) && printk_ratelimit())