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

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Message-ID: <20071205101845.GB22792@elte.hu>
Date:	Wed, 5 Dec 2007 11:18:45 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Adrian Bunk <bunk@...sta.de>
Cc:	Jeff Dike <jdike@...toit.com>, Adrian Bunk <bunk@...nel.org>,
	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


* 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?

	Ingo
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