linux-kernel - Re: [PATCH v3 2/3] mutex: add support for wound/wait style locks, v3

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Message-ID: <20130527082948.GF2781@laptop>
Date:	Mon, 27 May 2013 10:29:48 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Daniel Vetter <daniel@...ll.ch>
Cc:	Maarten Lankhorst <maarten.lankhorst@...onical.com>,
	linux-arch@...r.kernel.org, x86@...nel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	dri-devel <dri-devel@...ts.freedesktop.org>,
	"linaro-mm-sig@...ts.linaro.org" <linaro-mm-sig@...ts.linaro.org>,
	rob clark <robclark@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Dave Airlie <airlied@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>,
	"linux-media@...r.kernel.org" <linux-media@...r.kernel.org>
Subject: Re: [PATCH v3 2/3] mutex: add support for wound/wait style locks, v3

On Wed, May 22, 2013 at 06:49:04PM +0200, Daniel Vetter wrote:
> - _slow functions can check whether all acquire locks have been
> released and whether the caller is indeed blocking on the contending
> lock. Not doing so could either result in needless spinning instead of
> blocking (when blocking on the wrong lock) or in deadlocks (when not
> dropping all acquired).

We could add ww_mutex_assert_context_empty() or somesuch so that
paranoid people have a means of expressing themselves :-)
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