linux-kernel - Re: [PATCH 1/3] uml: use -mcmodel=kernel for x86

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Date:	Tue, 8 Aug 2006 16:14:47 +0200
From:	Andi Kleen <ak@...e.de>
To:	Paolo Giarrusso <blaisorblade@...oo.it>
Cc:	Jeff Dike <jdike@...toit.com>, linux-kernel@...r.kernel.org,
	user-mode-linux-devel@...ts.sourceforge.net
Subject: Re: [PATCH 1/3] uml: use -mcmodel=kernel for x86_64

On Tuesday 08 August 2006 16:03, Paolo Giarrusso wrote:
> Andi Kleen <ak@...e.de> ha scritto: 
> 
> > Paolo 'Blaisorblade' Giarrusso <blaisorblade@...oo.it> writes:
> > 
> > > From: Paolo 'Blaisorblade' Giarrusso <blaisorblade@...oo.it>
> > > 
> > > We have never used this flag and recently one user experienced a
> > complaining
> > > warning about this (there was a symbol in the positive half of
> > the address space
> > > IIRC). So fix it.
> > 
> > You can't use kernel cmodel in user space.  It requires running on
> > negative
> > virtual addresses. I would be surprised if it worked for you.
> 
> Argh, yes, I didn't test the patch and I didn't think to it a lot. So
> what about the following bug? Should we hack our own module loader
> based on x86-64's one?

Add the positive relocations to the standard x86-64 loader
and send me a patch. Then you can reuse it.

That should be cleaner than forking it

-Andi
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