From: Kevin Hilman <khilman@kernel.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
        Davidlohr Bueso <dave@stgolabs.net>,
        Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@redhat.com>,
        Steven Rostedt <rostedt@goodmis.org>,
        Mike Galbraith <umgwanakikbuti@gmail.com>,
        "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
        lkml <linux-kernel@vger.kernel.org>,
        Tyler Baker <tyler.baker@linaro.org>, Olof Johansson <olof@lixom.net>,
        Tony Lindgren <tony@atomide.com>,
        linux-omap <linux-omap@vger.kernel.org>,
        Santosh Shilimkar <ssantosh@kernel.org>, Felipe Balbi <balbi@ti.com>,
        Nishanth Menon <nm@ti.com>
Subject: Re: [PATCH v2] futex: lower the lock contention on the HB lock during wake up
References: <1432056298-18738-1-git-send-email-dave@stgolabs.net>
	<1432056298-18738-2-git-send-email-dave@stgolabs.net>
	<20150616192911.GA19500@linutronix.de>
	<1434484226.1903.19.camel@stgolabs.net>
	<20150617083350.GA2433@linutronix.de>
	<CAMAWPa9F3qP41XQ1jb9U+fQxUAogYnomHabbKj6PG1=Mf8sW2w@mail.gmail.com>
	<alpine.DEB.2.11.1506192053280.4107@nanos>
Date: Fri, 19 Jun 2015 12:32:56 -0700
In-Reply-To: <alpine.DEB.2.11.1506192053280.4107@nanos> (Thomas Gleixner's
	message of "Fri, 19 Jun 2015 20:54:44 +0200 (CEST)")
Message-ID: <7ha8vvtrx3.fsf@deeprootsystems.com>
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Thomas Gleixner <tglx@linutronix.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@linaro.org>

Kevin
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