linux-kernel - Re: [uml-devel] User Mode Linux still doesn't build in 2.6.23-final.

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Message-ID: <p73wste7zy5.fsf@bingen.suse.de>
Date:	Tue, 23 Oct 2007 14:55:30 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Al Viro <viro@....linux.org.uk>,
	WANG Cong <xiyou.wangcong@...il.com>,
	Sam Ravnborg <sam@...nborg.org>, Nix <nix@...eri.org.uk>,
	Jeff Dike <jdike@...toit.com>,
	Paolo Giarrusso <p.giarrusso@...il.com>,
	user-mode-linux-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, Rob Landley <rob@...dley.net>
Subject: Re: [uml-devel] User Mode Linux still doesn't build in 2.6.23-final.

Ingo Molnar <mingo@...e.hu> writes:
>
> the 'fastcall removal' changes to paravirt.c were over-eager: they
> removed fastcall annotations from functions that are (or might be)
> implemented in assembly. So if someone changes the compiler model,
> such as -pg which disables regparm, the kernel breaks in nasty ways.

It would be probably better to just not disable -mregparms. I don't
think the compiler forces this. And e.g. on x86-64 regparms & -pg 
work just fine, why should it not on i386?

> so this patch adds back fastcall annotations. This serves as
> documentation for assembly calling-convention dependencies as
> well.

You should rename it then to "asmcall" or something.

-Andi
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