From: David Howells <dhowells@redhat.com>
Date: Thu, 23 Feb 2012 13:51:00 +0000 (+0000)
Subject: NOMMU: Don't need to clear vm_mm when deleting a VMA
X-Git-Tag: v5.15~23106
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b94cfaf6685d691dc3fab023cf32f65e9b7be09c;p=platform%2Fkernel%2Flinux-starfive.git

NOMMU: Don't need to clear vm_mm when deleting a VMA

Don't clear vm_mm in a deleted VMA as it's unnecessary and might
conceivably break the filesystem or driver VMA close routine.

Reported-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
cc: stable@vger.kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/mm/nommu.c b/mm/nommu.c
index ee7e57ebef6a..f59e170fceb4 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -779,8 +779,6 @@ static void delete_vma_from_mm(struct vm_area_struct *vma)
 
 	if (vma->vm_next)
 		vma->vm_next->vm_prev = vma->vm_prev;
-
-	vma->vm_mm = NULL;
 }
 
 /*