mm/slub.c: freelist is ensured to be NULL when new_slab() fails

new_slab_objects() will return immediately if freelist is not NULL.

         if (freelist)
                 return freelist;

One more assignment operation could be avoided.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Peng Wang <[email protected]>
Reviewed-by: Pekka Enberg <[email protected]>
Reviewed-by: Andrew Morton <[email protected]>
Acked-by: David Rientjes <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc: Joonsoo Kim <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

mm/slub.c

@@ -2482,8 +2482,7 @@ static inline void *new_slab_objects(struct kmem_cache *s, gfp_t flags,
 		stat(s, ALLOC_SLAB);
 		c->page = page;
 		*pc = c;
-	} else
-		freelist = NULL;
+	}
 
 	return freelist;
 }