From: Mike Rapoport <rppt@linux.vnet.ibm.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Andrea Arcangeli <aarcange@redhat.com>,
"Dr . David Alan Gilbert" <dgilbert@redhat.com>,
Mike Kravetz <mike.kravetz@oracle.com>,
linux-mm <linux-mm@kvack.org>,
Mike Rapoport <rppt@linux.vnet.ibm.com>
Subject: [PATCH] userfaultfd: use mmgrab instead of open-coded increment of mm_count
Date: Mon, 16 Oct 2017 08:41:18 +0300 [thread overview]
Message-ID: <1508132478-7738-1-git-send-email-rppt@linux.vnet.ibm.com> (raw)
Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
---
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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reply other threads:[~2017-10-16 5:41 UTC|newest]
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