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

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Message-Id: <1245087957.17481.124.camel@nathan.suse.cz>
Date:	Mon, 15 Jun 2009 19:45:57 +0200
From:	Petr Tesarik <ptesarik@...e.cz>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Sam Ravnborg <sam@...nborg.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Andi Kleen <andi@...stfloor.org>,
	Roland McGrath <roland@...hat.com>
Subject: Re: [PATCH v2 0/8] clean up vdso-layout.lds.S

H. Peter Anvin píše v Po 15. 06. 2009 v 09:51 -0700:
> Petr Tesarik wrote:
> > Petr Tesarik píše v Po 15. 06. 2009 v 17:16 +0200:
> >> [...]
> >> An example can probably explain it better:
> >>
> >> $ cat >shared.c <<EOF
> >> int shared_object[100];
> >> EOF
> >> $ cat >exe.c <<EOF
> >> #include <stdio.h>
> >> extern int shared_object[100];
> >> int main(void) {
> >> 	printf("%p\n", &shared_object); 
> >> 	return 0;
> >> }
> >> EOF
> > 
> > BTW this example demonstrates that there is one section which should be
> > included in .data but is not:
> > 
> > 	*(COMMON)
> > 
> > I'll send a patch later.
> > 
> 
> *(COMMON) is BSS, not data...

Very true, but for the vDSO we decided to put both writeable and
read-only data into one section (called .data for that matter), probably
to reduce the number of sections and hence also the size of the
resulting binary.

Petr Tesarik


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