linux-kernel - Re: [PATCH] [0/9] Use 64bit x86 machine check code for 32bit too

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Date:	Mon, 07 Jul 2008 17:00:15 -0700
From:	Max Asbock <masbock@...ux.vnet.ibm.com>
To:	"H. Peter Anvin" <hpa@...nel.org>
Cc:	Andi Kleen <andi@...stfloor.org>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [0/9] Use 64bit x86 machine check code for 32bit too

On Mon, 2008-07-07 at 14:37 -0700, H. Peter Anvin wrote:
> H. Peter Anvin wrote:
> > Andi Kleen wrote:
> >> This patchkit uses the 64bit machine check code which is better in many
> >> ways on 32bit x86 too. This is also the basis for some future machine
> >> check work.
> > 
> > Hi Andi,
> > 
> > I tried applying your patch kit to -tip, but I'm getting build failures 
> > on i386; gcc-4.1.1-51.fc5.x86_64 with attached configuration.
> > 
> 
> FWIW, this is rooting the branch on top of current linus.  Applied on 
> top of tip/auto-x86-next or tip/master, the patch does not apply.
> 
> 	-hpa

The patches won't apply to -tip because Venki's patch has to be backed
out of mce_64.c and it looks like thread_info.h has been merged in the
mean time. 

I was able to apply the patches to 2.6.26-rc8 though, build it and boot
it. 
However it turns out the build warnings about 
"mce_64.c:822: warning: passing argument 2 of ‘strict_strtoull’ makes
integer from pointer without a cast"
are justified. It looks like strict_strtoull has the last two arguments
switched with respect to simple_strtoull. You get a NULL pointer
dereference as soon as you write to one of the machinecheck sysfs
control files.

Max

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