From: Christoph Hellwig <hch@lst.de>
To: Jason Baron <jbaron@akamai.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Christoph Hellwig <hch@lst.de>, Ingo Molnar <mingo@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Al Viro <viro@zeniv.linux.org.uk>,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: waitqueue lockdep annotation
Date: Thu, 30 Nov 2017 23:11:26 +0100 [thread overview]
Message-ID: <20171130221126.GA31795@lst.de> (raw)
In-Reply-To: <dd769c95-3eea-93a4-9da4-cb0024461a9b@akamai.com>
On Thu, Nov 30, 2017 at 04:38:02PM -0500, Jason Baron wrote:
> I don't think there is a bug here. The 'wake_up_locked()' calls in epoll
> are being protected by the ep->lock, not the wait_queue_head lock. So
> arguably the 'annotation' is wrong, but I don't think there is a bug
> beyond that.
They can't be protected by ep->lock. The file might as well be
watched for using poll or select as well, or just using epoll using
another epoll fd.
next prev parent reply other threads:[~2017-11-30 22:11 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-30 14:20 waitqueue lockdep annotation Christoph Hellwig
2017-11-30 14:20 ` [PATCH 1/2] sched/wait: assert the wait_queue_head lock is held in __wake_up_common Christoph Hellwig
2017-11-30 14:20 ` [PATCH 2/2] epoll: use proper wake_up variant in ep_poll_callback Christoph Hellwig
2017-11-30 20:50 ` waitqueue lockdep annotation Andrew Morton
2017-11-30 21:38 ` Jason Baron
2017-11-30 22:11 ` Christoph Hellwig [this message]
2017-11-30 22:18 ` Jason Baron
2017-12-01 17:11 ` Christoph Hellwig
2017-12-01 19:00 ` Jason Baron
2017-12-01 22:02 ` Christoph Hellwig
2017-12-01 22:34 ` Jason Baron
2017-12-01 23:03 ` Christoph Hellwig
2017-12-05 15:24 ` Jason Baron
2017-12-05 15:36 ` Davidlohr Bueso
2017-12-06 23:51 ` Christoph Hellwig
2017-12-06 23:52 Christoph Hellwig
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