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

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Message-ID: <20071207094439.GA26097@elte.hu>
Date:	Fri, 7 Dec 2007 10:44:39 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Roland McGrath <roland@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Harvey Harrison <harvey.harrison@...il.com>,
	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


* Roland McGrath <roland@...hat.com> 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> ---

thanks, applied.

	Ingo
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