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Date: Mon, 31 May 2010 18:29:38 +0200
From: Borislav Petkov <borislav.petkov@amd.com>
Subject: Re: [PATCH] x86, hweight: Fix UML boot crash
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To: Jeff Dike <jdike@addtoit.com>
Cc: Borislav Petkov <bp@alien8.de>, "H. Peter Anvin" <hpa@zytor.com>, Geert Uytterhoeven <geert@linux-m68k.org>, Toralf =?iso-8859-1?Q?F=F6rster?= <toralf.foerster@gmx.de>, "user-mode-linux-devel@lists.sourceforge.net" <user-mode-linux-devel@lists.sourceforge.net>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
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From: Jeff Dike <jdike@addtoit.com>
Date: Mon, May 31, 2010 at 11:56:19AM -0400

> On Mon, May 31, 2010 at 03:51:32PM +0200, Borislav Petkov wrote:
> > <arch/x86/include/asm/bitops.h> includes <asm/arch_hweight.h> which are
> > the optimized variants.
> 
> But how does UML get to arch/x86/include/asm/bitops.h in the first place?
> 
> It must go through an arch/um/include/asm/something.h (where something
> might be bitops) first, right?

Right, look at one of those dependencies file (for example,
arch/um/kernel/.ptrace.o.cmd) for a _very_ long inclusion chain which
contains <arch/x86/include/asm/arch_hweight.h> at some point.

-- 
Regards/Gruss,
Boris.

Operating Systems Research Center
Advanced Micro Devices, Inc.