slub: Add cmpxchg_double_slab()

Add a function that operates on the second doubleword in the page struct
and manipulates the object counters, the freelist and the frozen attribute.

Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
index c8668d161dd8..b42715294147 100644
--- a/include/linux/slub_def.h
+++ b/include/linux/slub_def.h
@@ -33,6 +33,7 @@ enum stat_item {
         DEACTIVATE_REMOTE_FREES,/* Slab contained remotely freed objects */
         ORDER_FALLBACK,         /* Number of times fallback was necessary */
         CMPXCHG_DOUBLE_CPU_FAIL,/* Failure of this_cpu_cmpxchg_double */
+        CMPXCHG_DOUBLE_FAIL,    /* Number of times that cmpxchg double did not match */
         NR_SLUB_STAT_ITEMS };
 
 struct kmem_cache_cpu {