linux-kernel - Re: [PATCH v2 0/8] clean up vdso-layout.lds.S

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Message-ID: <20090612180626.GB18203@uranus.ravnborg.org>
Date:	Fri, 12 Jun 2009 20:06:26 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	Petr Tesarik <ptesarik@...e.cz>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Andi Kleen <andi@...stfloor.org>,
	Roland McGrath <roland@...hat.com>
Subject: Re: [PATCH v2 0/8] clean up vdso-layout.lds.S

On Fri, Jun 12, 2009 at 03:40:32PM +0200, Petr Tesarik wrote:
> The handling of various sections in the VDSO linker script
> looks pretty haphazard. This patch series cleans it up in
> these regards:
> 
>  - improve the coding style
>  - remove superfluous sections
>  - issue a linker error if a section is encountered which
>    is known not to work
>  - check that the .got section is empty, except for the
>    three entries defined by the ABI
>  - discard sections which are not useful to user-space
> 
> Petr Tesarik (8):
>   x86: Adjust the coding style of vdso-layout.lds.S
>   x86: Remove .sdata from the vDSO linker script
>   x86: add .broken section to the vDSO linker script
>   x86: mark altinstr-related sections in vDSO as broken
>   x86: mark some standard sections as broken in a vDSO
>   x86: check the size of GOT in vDSO
>   x86: remove unneeded section from the vDSO
The above looks good.
Acked-by: Sam Ravnborg <sam@...nborg.org>

> 
>   x86: Remove .dynbss from the vDSO linker script
This one I am a little reluctant about as I do not understand
why ld sometimes adds and sometimes does not add this section.
At least judging from the arch specific linker scripts some archs
include it and others do not.

I grepped the binutils source and bfd/elf64-x86-64.c mentions
dynbss several times.
Maybe just adding it to broken would suffice as we would
then be informed it it is used by some ld versions?

	Sam
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