linux-kernel - Re: [PATCH 14/14] sched,lockdep: Employ lock pinning

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Date:	Fri, 05 Jun 2015 13:03:22 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	umgwanakikbuti@...il.com, mingo@...e.hu, ktkhai@...allels.com,
	rostedt@...dmis.org, tglx@...utronix.de, juri.lelli@...il.com,
	pang.xunlei@...aro.org, oleg@...hat.com,
	wanpeng.li@...ux.intel.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 14/14] sched,lockdep: Employ lock pinning

On Fri, 2015-06-05 at 11:57 +0200, Ingo Molnar wrote:
> * Peter Zijlstra <peterz@...radead.org> wrote:
> 
> > Employ the new lockdep lock pinning annotation to ensure no
> > 'accidental' lock-breaks happen with rq->lock.
> 
> btw., could we perhaps reorder this series a bit and first see that it properly 
> detects the original locking bug, and then only fix the bug?
> 
> To make sure the pinning infrastructure works and all that.

It works; I've had plenty explosions while trying to get some of the
less obvious code paths sorted. I've managed to hit every single WARN I
added ;-)

Also, for bisection it might be annoying to hit known bad points, which
is why its ordered this way.
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