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

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Message-Id: <E1JCiLx-0006lI-HR@pomaz-ex.szeredi.hu>
Date:	Wed, 09 Jan 2008 22:20:49 +0100
From:	Miklos Szeredi <miklos@...redi.hu>
To:	andi@...stfloor.org, harvey.harrison@...il.com
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.

Ah, right.  I didn't think of that.

Does that mean that FASTCALL removals will have to be undone?  Or is
there an alternative?

Miklos
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