linux-kernel - Re: [BISECTION RESULT] sched: revert cpu_clock to pre-27ec4407790d075c325e1f4da0a19c56953cce23 state

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Message-ID: <20080813192909.GA31685@us.ibm.com>
Date:	Wed, 13 Aug 2008 12:29:09 -0700
From:	Nishanth Aravamudan <nacc@...ibm.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	"Luck, Tony" <tony.luck@...el.com>,
	"linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [BISECTION RESULT] sched: revert cpu_clock to
	pre-27ec4407790d075c325e1f4da0a19c56953cce23 state

On 13.08.2008 [18:25:53 +0200], Ingo Molnar wrote:
> 
> * Luck, Tony <tony.luck@...el.com> wrote:
> 
> > > I'm happy to test any better patches.
> > 
> > Linus just took a patch from my tree that should solve this
> > once and for all for ia64.
> > 
> > commit 10617bbe84628eb18ab5f723d3ba35005adde143
> > Author: Tony Luck <tony.luck@...el.com>
> > Date:   Tue Aug 12 10:34:20 2008 -0700
> > 
> >     [IA64] Ensure cpu0 can access per-cpu variables in early boot code
> > 
> > 
> > When you get a chance please test with your config against this
> > tree just to confirm that this is fixed.
> 
> there's also Peter's other patch upstream since yesterday (and included 
> in -rc3) which should solve the same problem:
> 
> | commit c1955a3d4762e7a9bf84035eb3c4886a900f0d15
> | Author: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> | Date:   Mon Aug 11 08:59:03 2008 +0200
> |
> |    sched_clock: delay using sched_clock()
> |
> |    Some arch's can't handle sched_clock() being called too early - delay
> |    this until sched_clock_init() has been called.
> 
> so i'd be mighty surprised if this dual firepower of commits didnt at 
> least weaken this bug somewhat! ;-)

Well Peter's patch was tested-by me, so I know it fixes the problem on
the box I have access to, I'm verifying that -rc3 is ok.

Tony, would you like me to test your patch in isolation (reverting
c1955a3d4762e7a9bf84035eb3c4886a900f0d15) to see if it also fixes it?

Thanks,
Nish

-- 
Nishanth Aravamudan <nacc@...ibm.com>
IBM Linux Technology Center
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