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

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Date:	Wed, 09 Jul 2008 11:05:10 -0700
From:	Mike Travis <travis@....com>
To:	"H. Peter Anvin" <hpa@...or.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

H. Peter Anvin wrote:
> 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

Hmm, I wonder how the CONFIG_CC_STACKPROTECTOR was tested?  Could it
be a config option for building GCC itself?

Thanks,
Mike
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