linux-kernel - Re: [PATCH] x86: clean up vdso-layout.lds.S

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Message-Id: <1244536150.5199.33.camel@nathan.suse.cz>
Date:	Tue, 09 Jun 2009 10:29:10 +0200
From:	Petr Tesarik <ptesarik@...e.cz>
To:	Roland McGrath <roland@...hat.com>
Cc:	Sam Ravnborg <sam@...nborg.org>,
	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>
Subject: Re: [PATCH] x86: clean up vdso-layout.lds.S

Roland McGrath píše v Út 09. 06. 2009 v 01:09 -0700:
> > Which version of binutils are you using? I'm using binutils-2.19, and
> > all empty sections get completely discarded, i.e. they do not affect the
> > size of the output in any way.
> 
> Oh, empty, sure.  So then what is ".broken" for at all?
> I thought this was for the nonempty-but-useless ones like .got et al
> that the linker will insist on creating but we don't really need in the vDSO.

No, that's for collecting sections which should never ever appear in a
vDSO. Or rather, when these sections do appear in a vDSO, I know for
sure that the resulting vDSO will not work properly.

Petr Tesarik


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