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

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Date:	Tue, 20 Nov 2007 07:05:25 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Greg KH <gregkh@...e.de>, Greg KH <greg@...ah.com>,
	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


* 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.)

	Ingo
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