1 files changed, 9 insertions, 0 deletions

diff --git a/mm/slab.c b/mm/slab.c
index f257d4dd474d..d08692303f6e 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -2308,6 +2308,15 @@ kmem_cache_create (const char *name, size_t size, size_t align,
                 /* really off slab. No need for manual alignment */
                 slab_size =
                     cachep->num * sizeof(kmem_bufctl_t) + sizeof(struct slab);
+
+#ifdef CONFIG_PAGE_POISONING
+                /* If we're going to use the generic kernel_map_pages()
+                 * poisoning, then it's going to smash the contents of
+                 * the redzone and userword anyhow, so switch them off.
+                 */
+                if (size % PAGE_SIZE == 0 && flags & SLAB_POISON)
+                        flags &= ~(SLAB_RED_ZONE | SLAB_STORE_USER);
+#endif
         }
 
         cachep->colour_off = cache_line_size();