From: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
Date: Tue, 26 Mar 2013 23:24:40 +0000 (+1100)
Subject: mmap: find_vma: remove the WARN_ON_ONCE(!mm) check
X-Git-Tag: next-20130402~2^2~384
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=37fe2f754f82c2e3d4fd60cc4f40cbd28cad23d1;p=karo-tx-linux.git

mmap: find_vma: remove the WARN_ON_ONCE(!mm) check

Remove the WARN_ON_ONCE(!mm) check as the comment suggested.  Kernel code
calls find_vma only when it is absolutely sure that the mm_struct arg to
it is non-NULL.

Signed-off-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/mm/mmap.c b/mm/mmap.c
index 6466699b16cb..199318fbba3a 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1935,9 +1935,6 @@ struct vm_area_struct *find_vma(struct mm_struct *mm, unsigned long addr)
 {
 	struct vm_area_struct *vma = NULL;
 
-	if (WARN_ON_ONCE(!mm))		/* Remove this in linux-3.6 */
-		return NULL;
-
 	/* Check the cache first. */
 	/* (Cache hit rate is typically around 35%.) */
 	vma = mm->mmap_cache;