+ userfaultfd-use-mmgrab-instead-of-open-coded-increment-of-mm_count.patch added to -mm tree

+ userfaultfd-use-mmgrab-instead-of-open-coded-increment-of-mm_count.patch added to -mm tree

[akpm]

The patch titled
     Subject: userfaultfd: use mmgrab instead of open-coded increment of mm_count
has been added to the -mm tree.  Its filename is
     userfaultfd-use-mmgrab-instead-of-open-coded-increment-of-mm_count.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/userfaultfd-use-mmgrab-instead-of-open-coded-increment-of-mm_count.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/userfaultfd-use-mmgrab-instead-of-open-coded-increment-of-mm_count.patch

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------------------------------------------------------
From: Mike Rapoport <rppt@linux.vnet.ibm.com>
Subject: userfaultfd: use mmgrab instead of open-coded increment of mm_count

Link: http://lkml.kernel.org/r/1508132478-7738-1-git-send-email-rppt@linux.vnet.ibm.com
Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: "Dr . David Alan Gilbert" <dgilbert@redhat.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/userfaultfd.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -puN fs/userfaultfd.c~userfaultfd-use-mmgrab-instead-of-open-coded-increment-of-mm_count fs/userfaultfd.c
--- a/fs/userfaultfd.c~userfaultfd-use-mmgrab-instead-of-open-coded-increment-of-mm_count
+++ a/fs/userfaultfd.c
@@ -668,7 +668,7 @@ int dup_userfaultfd(struct vm_area_struc
 		ctx->features = octx->features;
 		ctx->released = false;
 		ctx->mm = vma->vm_mm;
-		atomic_inc(&ctx->mm->mm_count);
+		mmgrab(ctx->mm);
 
 		userfaultfd_ctx_get(octx);
 		fctx->orig = octx;
_

Patches currently in -mm which might be from rppt@linux.vnet.ibm.com are

userfaultfd-use-mmgrab-instead-of-open-coded-increment-of-mm_count.patch