Message-ID: <4874F890.5060008@zytor.com>
Date: Wed, 09 Jul 2008 13:42:40 -0400
From: "H. Peter Anvin" <hpa@zytor.com>
User-Agent: Thunderbird 2.0.0.14 (X11/20080501)
MIME-Version: 1.0
To: Mike Travis <travis@sgi.com>
CC: Jeremy Fitzhardinge <jeremy@goop.org>, Ingo Molnar <mingo@elte.hu>,
       Andrew Morton <akpm@linux-foundation.org>,
       "Eric W. Biederman" <ebiederm@xmission.com>,
       Christoph Lameter <cl@linux-foundation.org>,
       Jack Steiner <steiner@sgi.com>, linux-kernel@vger.kernel.org
Subject: Re: [RFC 00/15] x86_64: Optimize percpu accesses
References: <20080709165129.292635000@polaris-admin.engr.sgi.com> <4874F30C.8020800@zytor.com> <4874F7F2.6050108@sgi.com>
In-Reply-To: <4874F7F2.6050108@sgi.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1114
Lines: 36

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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/