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

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Date:	Wed, 14 Nov 2007 11:21:07 +1100
From:	CaT <cat@....com.au>
To:	Andi Kleen <ak@...e.de>
Cc:	patches@...-64.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [13/45] x86_64: Increase VDSO_TEXT_OFFSET for ancient binutils

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:

http://www.debianforum.de/forum/viewtopic.php?p=570102

Robotic english translation:
http://translate.google.com/translate?u=http%3A%2F%2Fwww.debianforum.de%2Fforum%2Fviewtopic.php%3Fp%3D569756%26sid%3D20278bfd231c5dac45fa0f2763c7ec54%23569756&langpair=de%7Cen&hl=en&ie=UTF-8

And it indicates that 0x510 would be the better offset due to 0x600
making it clash with the data section beneath. Indeed when I change it
to 0x510 I can compile the kernel with binutils 2.15-6.

I'm hoping this wont cause the kernel to eat my grandma. :)

-- 
    "To the extent that we overreact, we proffer the terrorists the
    greatest tribute."
    	- High Court Judge Michael Kirby
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