linux-kernel - Re: [crash, bisected] Re: clocksource: Resolve cpu hotplug dead lock with TSC unstable

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Message-ID: <20090914173720.5774c01f@skybase>
Date:	Mon, 14 Sep 2009 17:37:20 +0200
From:	Martin Schwidefsky <schwidefsky@...ibm.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Jens Axboe <jens.axboe@...cle.com>,
	John Stultz <johnstul@...ibm.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mike Galbraith <efault@....de>,
	Con Kolivas <kernel@...ivas.org>, linux-kernel@...r.kernel.org
Subject: Re: [crash, bisected] Re: clocksource: Resolve cpu hotplug dead
 lock with TSC unstable

On Mon, 14 Sep 2009 17:19:58 +0200
Ingo Molnar <mingo@...e.hu> wrote:

> Now another box crashes during bootup. Reverting these two:
> 
>  f79e025: clocksource: Resolve cpu hotplug dead lock with TSC unstable, fix crash
>  7285dd7: clocksource: Resolve cpu hotplug dead lock with TSC unstable
> 
> allows me to boot it.
> 
> plain 32-bit defconfig.

I've seen the bug report. init_workqueues comes after smp_init.
The idea I'm currently playing with is a simple check in the tsc
code if the tsc clocksource is already registered or not.
When smp_init is called the tsc is not yet registered, we could
just set the rating to zero.

-- 
blue skies,
   Martin.

"Reality continues to ruin my life." - Calvin.

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