linux-kernel - Re: [PATCH 2/2] sched_clock: Disable seqlock lockdep usage in sched

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Date:	Fri, 03 Jan 2014 07:05:14 +0100
From:	khalasa@...p.pl (Krzysztof Hałasa)
To:	John Stultz <john.stultz@...aro.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>, Willy Tarreau <w@....eu>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/2] sched_clock: Disable seqlock lockdep usage in sched_clock

John Stultz <john.stultz@...aro.org> writes:

> Unforunately the seqlock lockdep enablmenet can't be used
> in sched_clock, since the lockdep infrastructure eventually
> calls into sched_clock, which causes a deadlock.
>
> Thus, this patch changes all generic sched_clock usage
> to use the raw_* methods.

These two patches fix the problem. Thanks to all involved.
-- 
Krzysztof Halasa

Research Institute for Automation and Measurements PIAP
Al. Jerozolimskie 202, 02-486 Warsaw, Poland
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