linux-kernel - Re: [RFC 00/15] x86_64: Optimize percpu accesses

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Message-ID: <20080709202633.GC14386@cs181140183.pp.htv.fi>
Date:	Wed, 9 Jul 2008 23:26:33 +0300
From:	Adrian Bunk <bunk@...nel.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Mike Travis <travis@....com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Jack Steiner <steiner@....com>, linux-kernel@...r.kernel.org
Subject: Re: [RFC 00/15] x86_64: Optimize percpu accesses

On Wed, Jul 09, 2008 at 03:44:51PM -0400, H. Peter Anvin wrote:
> Ingo Molnar wrote:
>>
>> the problem is, we cannot just put it even into tip/master if there's 
>> no short-term hope of fixing a problem it triggers. gcc-4.2.3 is solid 
>> for me otherwise, for series of thousands of randomly built kernels.
>>
>
> 4.2.3 is fine; he was using 4.2.0 before, and as far as I know, 4.2.0  
> and 4.2.1 are known broken for the kernel.

Not sure where your knowledge comes from, but the ones I try to get 
blacklisted due to known gcc bugs are 4.1.0 and 4.1.1.

On a larger picture, we officially support gcc >= 3.2, and if any kernel 
change triggers a bug with e.g. gcc 3.2.3 that's technically a 
regression in the kernel...

> 	-hpa

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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