From: Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx> 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@xxxxxxxxxxxxxxxxxx Signed-off-by: Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx> Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx> Cc: "Dr . David Alan Gilbert" <dgilbert@xxxxxxxxxx> Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- 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; _ -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
