linux-kernel - Re: [PATCH v2] futex: lower the lock contention on the HB lock during wake up

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Message-ID: <7ha8vvtrx3.fsf@deeprootsystems.com>
Date:	Fri, 19 Jun 2015 12:32:56 -0700
From:	Kevin Hilman <khilman@...nel.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Davidlohr Bueso <dave@...olabs.net>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Mike Galbraith <umgwanakikbuti@...il.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	lkml <linux-kernel@...r.kernel.org>,
	Tyler Baker <tyler.baker@...aro.org>,
	Olof Johansson <olof@...om.net>,
	Tony Lindgren <tony@...mide.com>,
	linux-omap <linux-omap@...r.kernel.org>,
	Santosh Shilimkar <ssantosh@...nel.org>,
	Felipe Balbi <balbi@...com>, Nishanth Menon <nm@...com>
Subject: Re: [PATCH v2] futex: lower the lock contention on the HB lock during wake up

Thomas Gleixner <tglx@...utronix.de> writes:

> On Fri, 19 Jun 2015, Kevin Hilman wrote:
>> On Wed, Jun 17, 2015 at 1:33 AM, Sebastian Andrzej Siewior
>> A handful of boot test failures on ARM/OMAP were found by kernelci.org
>> in next-20150619[1] and were bisected down to this patch, which hit
>> next-20150619 in the form of commit 881bd58d6e9e (futex: Lower the
>> lock contention on the HB lock during wake up).  I confirmed that
>> reverting that patch on top of next-20150619 gets things booting again
>> for the affected platforms.
>> 
>> I haven't debugged this any further, but full boot logs are available
>> for the boot failures[2][3] and the linux-omap list and maintainer are
>> Cc'd here to help investigate further if needed.
>
> Found it. Dunno, how I missed that one. Fix below.
>

Yup, that fix on top of next-20150619 gets the two OMAP platforms
booting again.

Tested-by: Kevin Hilman <khilman@...aro.org>

Kevin
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