linux-kernel - Re: [PATCH] x86: Clean up mwait_play

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Message-ID: <20110413173634.GA1904@gere.osrc.amd.com>
Date:	Wed, 13 Apr 2011 19:36:34 +0200
From:	Borislav Petkov <bp@...64.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Frank Arnold <farnold@...64.org>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: Clean up mwait_play_dead

On Wed, Apr 13, 2011 at 09:52:40AM -0700, H. Peter Anvin wrote:
> On 04/13/2011 09:11 AM, Frank Arnold wrote:
> > From: Frank Arnold <frank.arnold@....com>
> > 
> > Commit 93789b32dbf355e70f18b17a82e8661677a7f7fb introduced
> > cpuinfo_x86 *c for brevity. It is used to check for the
> > mwait feature flag. The same can be done with a subsequent
> > check for clflsh and save us a second per-cpu pointer
> > dereference.
> > 
> > Signed-off-by: Frank Arnold <frank.arnold@....com>
> > Acked-by: Borislav Petkov <borislav.petkov@....com>
> > ---
> >  arch/x86/kernel/smpboot.c |    2 +-
> >  1 files changed, 1 insertions(+), 1 deletions(-)
> > 
> 
> This should be using this_cpu_has()... if that's not in the tree yet we
> should add it.

Looks like it is still in tip/x86/mm.

We could either redo the patch properly when this_cpu_has() is merged or
add the change against that branch.

-- 
Regards/Gruss,
Boris.

Advanced Micro Devices GmbH
Einsteinring 24, 85609 Dornach
General Managers: Alberto Bozzo, Andrew Bowd
Registration: Dornach, Gemeinde Aschheim, Landkreis Muenchen
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