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don't bother with vfsmount_lock in mounts_poll()
authorAl Viro <viro@zeniv.linux.org.uk>
Sun, 29 Sep 2013 14:59:59 +0000 (10:59 -0400)
committerAl Viro <viro@zeniv.linux.org.uk>
Fri, 25 Oct 2013 03:34:59 +0000 (23:34 -0400)
wake_up_interruptible/poll_wait provide sufficient barriers;
just use ACCESS_ONCE() to fetch ns->event and that's it.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

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