Message-ID: <4889F5FA.1050908@sgi.com>
Date: Fri, 25 Jul 2008 08:49:14 -0700
From: Mike Travis <travis@sgi.com>
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To: Jeremy Fitzhardinge <jeremy@goop.org>
CC: "H. Peter Anvin" <hpa@zytor.com>, 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,
       Hugh Dickins <hugh@veritas.com>
Subject: Re: [RFC 00/15] x86_64: Optimize percpu accesses
References: <20080709165129.292635000@polaris-admin.engr.sgi.com> <4874F30C.8020800@zytor.com> <4874F909.7060503@goop.org>
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Jeremy Fitzhardinge wrote:
> H. Peter Anvin wrote:
>> Did the suspected linker bug issue ever get resolved?
> 
> I don't believe so.  I think Mike is getting very early crashes
> depending on some combination of gcc, linker and kernel config.  Or
> something.
> 
> This fragility makes me very nervous.  It seems hard enough to get this
> stuff working with current tools; making it work over the whole range of
> supported tools looks like its going to be hard.
> 
>    J

FYI, I think it was a combination of errors that was causing my problems.
In any case, I've successfully compiled and booted Ingo's pesky config
config-Tue_Jul__1_16_48_45_CEST_2008.bad with gcc's 4.2.0, 4.2.3 and 4.2.4
on both Intel and AMD boxes.  (As well as a variety of other configs.)

I think Hugh's change adding "text" to the BUILD_IRQ macro might also have
helped, since interrupts seemed to have always been involved in the panics.
That might explain the variable-ness of the gcc version's.

Thanks,
Mike
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