linux-kernel - Re: [uml-devel] [PATCH] x86, hweight: Fix UML boot crash

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Message-ID: <20100613065837.GA5623@liondog.tnic>
Date:	Sun, 13 Jun 2010 08:58:37 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Paolo Giarrusso <p.giarrusso@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Borislav Petkov <borislav.petkov@....com>,
	Toralf Förster <toralf.foerster@....de>,
	user-mode-linux-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, Jeff Dike <jdike@...toit.com>
Subject: Re: [uml-devel] [PATCH] x86, hweight: Fix UML boot crash

From: Geert Uytterhoeven <geert@...ux-m68k.org>
Date: Sat, Jun 12, 2010 at 08:37:39PM +0200

> > Cool :). However, according to Geert, this doesn't fix it:
> >
> > http://marc.info/?l=linux-kernel&m=127522065202435&w=2
> >
> > It could be related to the -mregparm being broken on 32-bit UML since
> > Geert's UML "guest" is 32-bit. However, even if we fix this, it won't
> 
> No, guest and host are both x86_64.

Ok, maybe I don't understand UML - it's just that all address values in
the backtrace are 32-bit (e.g. RDX: 00000000ffff8aed, with the upper
8 bytes zeroed out) and I assumed that this is a 32-bit "guest" on a
64-bit host.

-- 
Regards/Gruss,
    Boris.
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