linux-kernel - Re: Specific support for Intel Atom architecture

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Date:	Sun, 3 May 2009 07:38:23 +0200
From:	Willy Tarreau <w@....eu>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Tobias Doerffel <tobias.doerffel@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Arjan van de Ven <arjan@...radead.org>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Specific support for Intel Atom architecture

On Thu, Apr 30, 2009 at 10:10:08AM -0700, H. Peter Anvin wrote:
> Ingo Molnar wrote:
> >> diff --git a/arch/x86/Makefile_32.cpu b/arch/x86/Makefile_32.cpu
> >> index 80177ec..07a11b0 100644
> >> --- a/arch/x86/Makefile_32.cpu
> >> +++ b/arch/x86/Makefile_32.cpu
> >> @@ -33,6 +33,7 @@ cflags-$(CONFIG_MCYRIXIII)	+= $(call cc-option,-march=c3,-march=i486) $(align)-f
> >>  cflags-$(CONFIG_MVIAC3_2)	+= $(call cc-option,-march=c3-2,-march=i686)
> >>  cflags-$(CONFIG_MVIAC7)		+= -march=i686
> >>  cflags-$(CONFIG_MCORE2)		+= -march=i686 $(call tune,core2)
> >> +cflags-$(CONFIG_MATOM)		+= -march=atom $(call tune,atom)
> >>  
> 
> There should be a fallback option used here rather than requiring a new
> gcc, e.g. something like:
> 
> $(call cc-option,-march=atom,-march=i686)

if it's an in-order architecture, wouldn't it be better to tune for i386
or i486 instead ?

Willy

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