linux-kernel - Re: [PATCH 7/8] Implement smp_processor

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Date:	Thu, 31 Aug 2006 22:34:51 +0100
From:	Ian Campbell <Ian.Campbell@...Source.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	linux-kernel@...r.kernel.org,
	Chuck Ebbert <76306.1226@...puserve.com>,
	Zachary Amsden <zach@...are.com>,
	Jan Beulich <jbeulich@...ell.com>, Andi Kleen <ak@...e.de>,
	Andrew Morton <akpm@...l.org>
Subject: Re: [PATCH 7/8] Implement smp_processor_id() with the PDA.

On Thu, 2006-08-31 at 12:10 -0700, Jeremy Fitzhardinge wrote:
> Ian Campbell wrote:
> > smp_processor_id() is defined for !SMP in include/linux/smp.h, I don't
> > know if it would be appropriate to add early_smp_processor_id() there
> > since it seems i386 specific. asm/smp.h isn't included by linux/smp.h
> > when !SMP but you could add an explicit include to common.c I suppose.
> >   
> The simple solution is to just define a !SMP version of 
> early_smp_processor_id().  It's i386 specific, but that's the only arch 
> that uses it:

Are you sure that works? When I tried it didn't. I think because
asm/smp.h isn't included by linux/smp.h for !SMP.

I needed the below to make it work, but including linux/smp.h and
asm/smp.h in the same file smells a bit fishy to me... Probably
acceptable for now if you are thinking of redoing SMP processor bringup
anyway.

diff -r fa530c593b97 arch/i386/kernel/cpu/common.c
--- a/arch/i386/kernel/cpu/common.c     Thu Aug 31 22:28:11 2006 +0100
+++ b/arch/i386/kernel/cpu/common.c     Thu Aug 31 22:33:08 2006 +0100
@@ -13,6 +13,7 @@
 #include <asm/mmu_context.h>
 #include <asm/mtrr.h>
 #include <asm/mce.h>
+#include <asm/smp.h>
 #ifdef CONFIG_X86_LOCAL_APIC
 #include <asm/mpspec.h>
 #include <asm/apic.h>

Ian.


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