linux-kernel - Re: [stable] Soft lockups since stable kernel upgrade to 2.6.23.8

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Message-ID: <20071120170519.GB15954@kroah.com>
Date:	Tue, 20 Nov 2007 09:05:19 -0800
From:	Greg KH <greg@...ah.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>, Greg KH <gregkh@...e.de>,
	David <david@...olicited.net>,
	Javier Kohen <jkohen@...rs.sourceforge.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, stable@...nel.org
Subject: Re: [stable] Soft lockups since stable kernel upgrade to 2.6.23.8

On Tue, Nov 20, 2007 at 07:05:25AM +0100, Ingo Molnar wrote:
> 
> * Jeremy Fitzhardinge <jeremy@...p.org> wrote:
> 
> > Greg KH wrote:
> > > Can you try applying the patch below to see if that solves the problem
> > > for you?
> > >   
> > 
> > I don't think this patch will help; it only has cosmetic changes in
> > addition to the original message printing fix.  I think it also needs
> > change a3b13c23f186ecb57204580cc1f2dbe9c284953a:
> > 
> > diff -r 79f0ea1e0e70 -r 06f060ab58aa kernel/softlockup.c
> 
> yes, it does need the cpu_clock() changes as i mentioned.
> 
>   commit a3b13c23f186ecb57204580cc1f2dbe9c284953a
>   Author: Ingo Molnar <mingo@...e.hu>
>   Date:   Tue Oct 16 23:26:06 2007 -0700
> 
>     softlockup: use cpu_clock() instead of sched_clock()
> 
>     sched_clock() is not a reliable time-source, use cpu_clock() instead.
> 
> but we only have cpu_clock() from v2.6.23 onwards - so we should not 
> apply the original patch to v2.6.22. (we should not have applied your 
> patch that started the mess to begin with - but that's another matter.)

Well, I can easily back that one out, if that is easier than adding 2
more patches to try to fix up the mess here.

Let me know if you feel that would be best.

thanks,

greg k-h
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