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

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Date:	Fri, 25 Jul 2008 08:49:14 -0700
From:	Mike Travis <travis@....com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	"H. Peter Anvin" <hpa@...or.com>, 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,
	Hugh Dickins <hugh@...itas.com>
Subject: Re: [RFC 00/15] x86_64: Optimize percpu accesses

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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