linux-kernel - Re: uml and -regparm=3

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Message-ID: <Pine.LNX.4.61.0801091659060.29624@chaos.analogic.com>
Date:	Wed, 9 Jan 2008 17:01:52 -0500
From:	"linux-os (Dick Johnson)" <linux-os@...logic.com>
To:	"Miklos Szeredi" <miklos@...redi.hu>
Cc:	<jdike@...toit.com>, <akpm@...ux-foundation.org>,
	<linux-kernel@...r.kernel.org>,
	<user-mode-linux-devel@...ts.sourceforge.net>
Subject: Re: uml and -regparm=3

On Wed, 9 Jan 2008, Miklos Szeredi wrote:

> FASTCALL is defined empty in -mm, but UML is not compiled with
> -mregparm=3 and so this breaks things (I noticed problems with
> rwsem_down_write_failed).
>
> Tried recompiling UML with -mregparm=3, but that resulted in a strange
> failure immediately after startup:
>
> |.%Gÿÿÿÿÿÿ.%@: Invalid argument
>
> What's up?
>
> Miklos
> --

UML gets linked with the 'C' runtime library. It doesn't
pass parameters in registers unless you get the source and
recompile the whole thing --and then you would have to
recompile all your applications, too. Yikes!

Cheers,
Dick Johnson
Penguin : Linux version 2.6.22.1 on an i686 machine (5588.29 BogoMips).
My book : http://www.AbominableFirebug.com/
_

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