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

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Message-ID: <4C0F4C40.5020207@panasas.com>
Date:	Wed, 09 Jun 2010 11:09:36 +0300
From:	Boaz Harrosh <bharrosh@...asas.com>
To:	Borislav Petkov <bp@...en8.de>, "H. Peter Anvin" <hpa@...or.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Toralf Förster <toralf.foerster@....de>,
	uml-devel <user-mode-linux-devel@...ts.sourceforge.net>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [uml-devel] [PATCH resend] um, hweight: Fix UML boot crash

On 06/09/2010 11:04 AM, Boaz Harrosh wrote:
> From: Borislav Petkov <bp@...en8.de>
> 
> Obviously UML cannot stomach callee reg-saving trickery
> introduced with d61931d89be506372d01a90d1755f6d0a9fafe2d
> (x86: Add optimized popcnt variants) and oopses during boot:
> http://marc.info/?l=linux-kernel&m=127522065202435&w=2
> 
> Redirect arch_hweight.h include from the x86 portion to the generic
> arch_hweight.h which is a fallback to the software hweight routines.
> 
> LKML-Reference: <201005271944.09541.toralf.foerster@....de>
> Signed-off-by: Borislav Petkov <bp@...en8.de>

who's going to push this ASAP. I was just (again) 3/4 through a bisect
on 2.6.35-rc2. When I finally realized "Hey that patch, I forgot".
(My concentration is not what it used to be)

Please push this, someone
Boaz

> ---
>  arch/um/include/asm/arch_hweight.h |    6 ++++++
>  1 files changed, 6 insertions(+), 0 deletions(-)
>  create mode 100644 arch/um/include/asm/arch_hweight.h
> 
> diff --git a/arch/um/include/asm/arch_hweight.h b/arch/um/include/asm/arch_hweight.h
> new file mode 100644
> index 0000000..c656cf4
> --- /dev/null
> +++ b/arch/um/include/asm/arch_hweight.h
> @@ -0,0 +1,6 @@
> +#ifndef _ASM_UM_HWEIGHT_H
> +#define _ASM_UM_HWEIGHT_H
> +
> +#include <asm-generic/bitops/arch_hweight.h>
> +
> +#endif
> -- 1.7.1 
> 
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