linux-kernel - Re: MCE, AMD: Hide smp-only code around CONFIG

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Date:	Wed, 8 Feb 2012 14:05:41 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Kevin Winchester <kjwinchester@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Nick Bowler <nbowler@...iptictech.com>,
	Randy Dunlap <rdunlap@...otime.net>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: MCE, AMD: Hide smp-only code around CONFIG_SMP

On Wed, Feb 08, 2012 at 08:22:11AM -0400, Kevin Winchester wrote:
> Does this work?  arch/x86/kernel/cpu/mcheck/mce_amd.c includes
> <linux/smp.h> rather than <asm/smp.h> directly.  And <linux/smp.h>
> only includes <asm/smp.h> for the CONFIG_SMP case.  Or perhaps one of
> the other includes in mce_amd.c includes <asm/smp.h>?

It looks like it:

$ make arch/x86/kernel/cpu/mcheck/mce_amd.i
$ grep 'asm/smp.h' arch/x86/kernel/cpu/mcheck/mce_amd.i
# 1 "/home/boris/kernel/linux-2.6/arch/x86/include/asm/smp.h" 1
# 13 "/home/boris/kernel/linux-2.6/arch/x86/include/asm/smp.h"
# 14 "/home/boris/kernel/linux-2.6/arch/x86/include/asm/smp.h" 2
# 16 "/home/boris/kernel/linux-2.6/arch/x86/include/asm/smp.h" 2

and this one pulls in the cpu_llc* crap.

# 183 "/home/boris/kernel/linux-2.6/arch/x86/include/asm/smp.h"
# 225 "/home/boris/kernel/linux-2.6/arch/x86/include/asm/smp.h"
# 236 "/home/boris/kernel/linux-2.6/arch/x86/include/asm/smp.h"

So some other headers seem to pull in asm/smp.h.

HTH.

-- 
Regards/Gruss,
Boris.
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