linux-kernel - Re: [PATCH] [13/45] x86_64: Increase VDSO_TEXT

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Message-Id: <200711140125.17891.ak@suse.de>
Date:	Wed, 14 Nov 2007 01:25:17 +0100
From:	Andi Kleen <ak@...e.de>
To:	CaT <cat@....com.au>
Cc:	patches@...-64.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [13/45] x86_64: Increase VDSO_TEXT_OFFSET for ancient binutils

On Wednesday 14 November 2007 01:21:07 CaT wrote:
> On Fri, Sep 21, 2007 at 10:44:54PM +0200, Andi Kleen wrote:
> > For some reason old binutils genertate larger headers so
> > increase the text offset of the vdso to avoid linker errors.
> > 
> > Signed-off-by: Andi Kleen <ak@...e.de>
> > 
> > ---
> >  arch/x86_64/vdso/voffset.h |    2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > Index: linux/arch/x86_64/vdso/voffset.h
> > ===================================================================
> > --- linux.orig/arch/x86_64/vdso/voffset.h
> > +++ linux/arch/x86_64/vdso/voffset.h
> > @@ -1 +1 @@
> > -#define VDSO_TEXT_OFFSET 0x500
> > +#define VDSO_TEXT_OFFSET 0x600
> 
> This still breaks under Debian sarge. There is this (german) forum
> thread about it:

iirc sarge was the one with the unfixable 2MB text pages, generating gigantic 
vDSOs. At least from my side i essentially gave up on that one because
there was no way to generate a reasonable vDSO.

You'll need to either up- or downgrade your binutils. There was only a narrow 
window where binutils were broken such, but that release unfortunately hit it.

-Andi
-
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