1 files changed, 6 insertions, 2 deletions

diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
index 30b154ce7289..f8e0c86c48a9 100644
--- a/include/linux/slub_def.h
+++ b/include/linux/slub_def.h
@@ -80,8 +80,12 @@ extern struct kmem_cache kmalloc_caches[KMALLOC_SHIFT_HIGH + 1];
  */
 static inline int kmalloc_index(int size)
 {
-        if (size == 0)
-                return 0;
+        /*
+         * We should return 0 if size == 0 but we use the smallest object
+         * here for SLAB legacy reasons.
+         */
+        WARN_ON_ONCE(size == 0);
+
         if (size > 64 && size <= 96)
                 return 1;
         if (size > 128 && size <= 192)