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From: Christoph Hellwig <hch@lst.de>
To: Ingo Molnar <mingo@redhat.com>, eter Zijlstra <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
        Al Viro <viro@zeniv.linux.org.uk>, linux-fsdevel@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: waitqueue lockdep annotation
Date: Thu, 30 Nov 2017 06:20:35 -0800
Message-Id: <20171130142037.19339-1-hch@lst.de>
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Hi all,

this series adds a strategic lockdep_assert_held to __wake_up_common
to ensure callers really do hold the wait_queue_head lock when calling
the unlocked wake_up variants.  It turns out epoll did not do this
for a fairly common path (hit all the time by systemd during bootup),
so the second patch fixed this instance as well.