linux-kernel - Re: [RFC PATCH] x86: Unify include/asm-x86/linkage

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Message-ID: <20071205121723.GK15974@stusta.de>
Date:	Wed, 5 Dec 2007 13:17:23 +0100
From:	Adrian Bunk <bunk@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Jeff Dike <jdike@...toit.com>,
	Harvey Harrison <harvey.harrison@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH] x86: Unify include/asm-x86/linkage_[32|64].h

On Wed, Dec 05, 2007 at 11:18:45AM +0100, Ingo Molnar wrote:
> 
> * Adrian Bunk <bunk@...sta.de> wrote:
> 
> > On Tue, Dec 04, 2007 at 07:19:45PM -0500, Jeff Dike wrote:
> > > On Wed, Dec 05, 2007 at 12:15:19AM +0100, Adrian Bunk wrote:
> > > > UML can't switch to the regparm(3) convention on i386 since it links 
> > > > with userspace code, so if assembler code uses this calling convention 
> > > > we need the C prototype of it annotated accordingly.
> > > 
> > > We're not talking about a global calling convention switch, right?
> > > We're talking about selected functions only, in which case, the fact
> > > that UML links against libc is irrelevant.
> > 
> > The non-UML i386 switched to globally using the regparm(3) calling 
> > convention in 2.6.20.
> 
> maybe i'm a bit dense, but why cannot UML switch to -mregparm=3 too?

The UML kernel is linked against libc...

> 	Ingo

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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