Commit ee5df057 authored Apr 29, 2013 by Zhang Yanfei Committed by Linus Torvalds Apr 29, 2013

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>

parent 13ba3fcb

mm/mmap.c

+0 −3

Original line number	Diff line number	Diff line
		@@ -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);