From 7f03a3c0446eafe31ed013cfda554e988a155965 Mon Sep 17 00:00:00 2001
From: Andrew Morton <akpm@linux-foundation.org>
Date: Sat, 21 Jul 2012 10:53:54 +1000
Subject: [PATCH] mm-make-vb_alloc-more-foolproof-fix

use WARN_ON-return-value feature

Cc: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
 mm/vmalloc.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 1f769b0aac1a..2bb90b1d241c 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -904,13 +904,12 @@ static void *vb_alloc(unsigned long size, gfp_t gfp_mask)
 
 	BUG_ON(size & ~PAGE_MASK);
 	BUG_ON(size > PAGE_SIZE*VMAP_MAX_ALLOC);
-	if (size == 0) {
+	if (WARN_ON(size == 0)) {
 		/*
 		 * Allocating 0 bytes isn't what caller wants since
 		 * get_order(0) returns funny result. Just warn and terminate
 		 * early.
 		 */
-		WARN_ON(1);
 		return NULL;
 	}
 	order = get_order(size);
-- 
2.39.5