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authorMike Rapoport <rppt@linux.vnet.ibm.com>2017-11-15 17:36:56 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-11-15 18:21:05 -0800
commit00bb31fa44acf9591018810ff9d5ab375779c1cc (patch)
tree2c66edaefa2b2eab70cb7c440c55b547e36749ff /fs
parent85ccc8fa81af74c3c9133cf243fb75f65d02a59a (diff)
downloadlinux-00bb31fa44acf9591018810ff9d5ab375779c1cc.tar.bz2
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> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/userfaultfd.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c
index f46d133c0949..ac9a4e65ca49 100644
--- a/fs/userfaultfd.c
+++ b/fs/userfaultfd.c
@@ -668,7 +668,7 @@ int dup_userfaultfd(struct vm_area_struct *vma, struct list_head *fcs)
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;