linux-kernel - Re: Fwd: Commit 76a2a6ee8a0660a29127f05989ac59ae1ce865fa breaks PXA270 (at least)?

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Message-ID: <20080731215703.GA5392@flint.arm.linux.org.uk>
Date:	Thu, 31 Jul 2008 22:57:03 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	vatsa@...ux.vnet.ibm.com, efault@....de,
	linux-kernel@...r.kernel.org, Bill Gatliff <bgat@...lgatliff.com>
Subject: Re: Fwd: Commit 76a2a6ee8a0660a29127f05989ac59ae1ce865fa breaks PXA270 (at least)?

On Thu, Jul 31, 2008 at 11:47:55PM +0200, Peter Zijlstra wrote:
> On Thu, 2008-07-31 at 23:37 +0200, Ingo Molnar wrote:
> > * Andrew Morton <akpm@...ux-foundation.org> wrote:
> > 
> > > On Tue, 29 Jul 2008 23:31:05 +0100
> > > Russell King - ARM Linux <linux@....linux.org.uk> wrote:
> > > 
> > > > But then some bright spark thought it would be a good idea to get
> > > > rid of printk_clock().
> > > 
> > > <does git-log, searches for printk_clock>
> > 
> > i think this is a fresh regression via the introduction of 
> > kernel/sched_clock.c. We lost the (known) early-init behavior of 
> > cpu_clock() in the !UNSTABLE_SCHED_CLOCK case. The fix would be to 
> > restore that, not to reintroduce printk_clock().
> > 
> > Peter, any ideas?
> 
> How about something like this, it builds an atificial delay, exactly
> like we already have for the HAVE_UNSTABLE_SCHED_CLOCK case.
> 
> This keeps cpu_clock() 0 until after sched_clock_init().
> 
> Russell, Bill, is this sufficient?

It looks like it should.  Bill - can you test the patch in Peter's mail
please?

Thanks.
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