From: Christoph Lameter <clameter@sgi.com>
Date: Thu, 17 May 2007 05:10:53 +0000 (-0700)
Subject: slab: warn on zero-length allocations
X-Git-Tag: firefly_0821_release~29092
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=0b44f7a5b5078d737b3f5914978aabb761254840;p=firefly-linux-kernel-4.4.55.git

slab: warn on zero-length allocations

slub warns on this, and we're working on making kmalloc(0) return NULL.
Let's make slab warn as well so our testers detect such callers more
rapidly.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/mm/slab.c b/mm/slab.c
index 12344432e201..2043102c0425 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -789,6 +789,7 @@ static inline struct kmem_cache *__find_general_cachep(size_t size,
 	 */
 	BUG_ON(malloc_sizes[INDEX_AC].cs_cachep == NULL);
 #endif
+	WARN_ON_ONCE(size == 0);
 	while (size > csizep->cs_size)
 		csizep++;