linux-kernel - waitqueue lockdep annotation V3

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Date:   Thu, 14 Dec 2017 16:23:41 +0100
From:   Christoph Hellwig <hch@....de>
To:     Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Jason Baron <jbaron@...mai.com>, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: waitqueue lockdep annotation V3

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.

Changes since V2:
  - various typo fixes
  - updated comments in epoll to always refer to ep->wq.lock
  - add the new userfaultd patch from Matthew

Changes since V1:
 - remove eq->lock in epoll