linux-kernel - Re: [patch] cpufreq: mark cpufreq_tsc() as core_initcall

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Date:	Wed, 22 Nov 2006 09:01:31 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Oleg Nesterov <oleg@...sign.ru>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: [patch] cpufreq: mark cpufreq_tsc() as core_initcall_sync

On Tue, Nov 21, 2006 at 09:17:59PM -0500, Alan Stern wrote:
> On Tue, 21 Nov 2006, Paul E. McKenney wrote:
> 
> > > Things may not be quite as bad as they appear.  On many architectures the
> > > store-mb-load pattern will work as expected.  (In fact, I don't know which
> > > architectures it might fail on.)
> >
> > Several weak-memory-ordering CPUs.  :-/
> 
> Of the CPUs supported by Linux, do you know which ones will work with
> store-mb-load and which ones won't?

I have partial lists at this point.  I confess to not having made
much progress porting my memory-barrier torture tests to the relevant
architectures over the past few weeks (handling the lack of synchronized
lightweight fine-grained timers being the current obstacle), but will
let people know once I have gotten the tests working on the machines
that I have access to.

I don't have access to SMP Alpha or ARM machines (or UP either, for that
matter), so won't be able to test those.

						Thanx, Paul
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