[PATCH] userfaultfd: use mmgrab instead of open-coded increment of mm_count

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Signed-off-by: Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx>
---
 fs/userfaultfd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c
index ef4b48d1ea42..876b670f602e 100644
--- a/fs/userfaultfd.c
+++ b/fs/userfaultfd.c
@@ -662,7 +662,7 @@ 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;
-- 
2.7.4

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