From: Christoph Hellwig <hch@lst.de>
To: Ingo Molnar <mingo@redhat.com>, Peter Zijlstra <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Al Viro <viro@zeniv.linux.org.uk>,
Andrea Arcangeli <aarcange@redhat.com>,
Mike Rapoport <rppt@linux.vnet.ibm.com>,
Jason Baron <jbaron@akamai.com>,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: waitqueue lockdep annotation V3
Date: Thu, 14 Dec 2017 16:23:41 +0100 [thread overview]
Message-ID: <20171214152344.6880-1-hch@lst.de> (raw)
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
next reply other threads:[~2017-12-14 15:23 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-14 15:23 Christoph Hellwig [this message]
2017-12-14 15:23 ` [PATCH 1/3] epoll: use the waitqueue lock to protect ep->wq Christoph Hellwig
2017-12-14 15:23 ` [PATCH 2/3] userfaultfd: use fault_wqh lock Christoph Hellwig
2017-12-17 7:10 ` Mike Rapoport
2017-12-14 15:23 ` [PATCH 3/3] sched/wait: assert the wait_queue_head lock is held in __wake_up_common Christoph Hellwig
2018-07-12 19:17 ` waitqueue lockdep annotation V3 Davidlohr Bueso
2018-07-17 14:24 ` Christoph Hellwig
2018-07-17 15:04 ` Peter Zijlstra
2018-07-17 15:09 ` Christoph Hellwig
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