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authorZhang Yanfei <zhangyanfei@cn.fujitsu.com>2013-04-29 15:07:42 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-04-29 15:54:34 -0700
commitee5df0570c8af2610b28ab79bd8f8f8195687773 (patch)
tree988aaab853c133f7dbee9bcb7efdd016ef36f275
parent13ba3fcbbe31068b1ee7c39a0b58ecbed03c4d72 (diff)
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> Cc: k80c <k80ck80c@gmail.com> Cc: Michel Lespinasse <walken@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/mmap.c3
1 files changed, 0 insertions, 3 deletions
diff --git a/mm/mmap.c b/mm/mmap.c
index 0db0de1c2fb..b2c363f7ae5 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 = ACCESS_ONCE(mm->mmap_cache);