linux-kernel - Re: 2.6.23-rc3-mm1

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Date:	Thu, 23 Aug 2007 14:07:42 +0200
From:	Andi Kleen <ak@...e.de>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Mel Gorman <mel@....ul.ie>, linux-kernel@...r.kernel.org,
	Sam Ravnborg <sam@...nborg.org>, Andi Kleen <ak@...e.de>
Subject: Re: 2.6.23-rc3-mm1

On Wed, Aug 22, 2007 at 11:10:29AM -0700, Andrew Morton wrote:
> x86_64-mm-less-stack-alignment.patch has
> 
> cflags-y += $(call cc-option,-mpreferred-stack-boundary=3)
> 
> So we _should_ have detected that gcc didn't like =3, so it
> should not have been used.

The flag actually needs a recent gcc 4.3 snapshot (it's
a new feature the gcc developers added especially for the
kernel :), so if this didn't work it would fail on the vast 
majority of systems.

Somehow it doesn't? At least here it compiles fine.

I notice the final comma is missing, Mel does it work
when you change the line to 

cflags-y += $(call cc-option,-mpreferred-stack-boundary=3,)  

If not please run
gcc -O2 -mpreferred-stack-boundary=2 -S -xc /dev/null -o x.o 
echo $?

What does the echo output?

-Andi

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