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

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Date:	Fri, 25 Jul 2008 09:08:54 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Mike Travis <travis@....com>
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

Mike Travis wrote:
> 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.)
>   

Good.  What compilers have you tested?  Will it work over the complete 
supported range?

> 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.

Yes, indeed.  That was a nasty one, and will be very sensitive to the 
exact order gcc decided to emit things.

    J
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