linux-kernel - Re: [PATCH x86/mm] x86 vDSO: canonicalize sysenter .eh

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Message-Id: <1196990853.22471.15.camel@brick>
Date:	Thu, 06 Dec 2007 17:27:33 -0800
From:	Harvey Harrison <harvey.harrison@...il.com>
To:	Roland McGrath <roland@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Laurent Riffard <laurent.riffard@...e.fr>,
	Miles Lane <miles.lane@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH x86/mm] x86 vDSO: canonicalize sysenter .eh_frame

On Thu, 2007-12-06 at 17:14 -0800, Roland McGrath wrote:
> Some assembler versions automagically optimize .eh_frame contents,
> changing their size.  The CFI in sysenter.S was not using optimal
> formatting, so it would be changed by newer/smarter assemblers.
> This ran afoul of the wired constant for padding out the other vDSO
> images to match its size.  This changes the original hand-coded
> source to use the optimal format encoding for its operations.  That
> leaves nothing more for a fancy assembler to do, so the sizes will
> match the wired-in expected size regardless of the assembler version.
> 
> Signed-off-by: Roland McGrath <roland@...hat.com>

Confirm this fixes the compile errors I was seeing with x86.git

Harvey

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