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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>
This commit is contained in:
Zhang Yanfei 2013-04-29 15:07:42 -07:00 committed by Linus Torvalds
parent 13ba3fcbbe
commit ee5df0570c
1 changed files with 0 additions and 3 deletions
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3
mm/mmap.c
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@ -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);