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

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Message-ID: <p734pdmput0.fsf@bingen.suse.de>
Date:	Wed, 09 Jan 2008 22:12:43 +0100
From:	Andi Kleen <andi@...stfloor.org>
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

Miklos Szeredi <miklos@...redi.hu> writes:

> 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:
>
> |%Gï¿½%@: Invalid argument
>
> What's up?

UML links with glibc and that does not use -mregparm. 

You can only use -mregparm in user space if you recompile
all libraries too.

-Andi
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