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

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Date:	Wed, 09 Jul 2008 13:42:40 -0400
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Mike Travis <travis@....com>
CC:	Jeremy Fitzhardinge <jeremy@...p.org>, Ingo Molnar <mingo@...e.hu>,
	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

Mike Travis wrote:
> H. Peter Anvin wrote:
>> Hi Mike,
>>
>> Did the suspected linker bug issue ever get resolved?
>>
>>     -hpa
> 
> Hi Peter,
> 
> I was not able to figure out how the two versions of the same
> kernel compiled by gcc-4.2.0 and gcc-4.2.4 differed.   Currently,
> I'm sticking with gcc-4.2.4 as it boots much farther.
> 
> There still is a problem where if I bump THREAD_ORDER, the
> problem goes away and everything so far that I've tested boots
> up fine.
> 
> We tried to install a later gcc (4.3.1) that might have the
> "GCC_HAS_SP" flag but our sys admin reported:
> 
> 	The 4.3.1 version gives me errors on the make.  I had to
> 	pre-install gmp and mpfr, but, I still get errors on the make.
> 
> I think that was the latest he found on the GNU/GCC site.
> 

We have seen miscompilations with gcc 4.3.0 at least; not sure about 4.3.1.

	-hpa

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