Commit 00bb31fa authored Nov 15, 2017 by Mike Rapoport Committed by Linus Torvalds Nov 15, 2017

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>

parent 85ccc8fa

fs/userfaultfd.c

+1 −1

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