From: ravikiran thirumalai <kiran@scalex86.org>
Date: Mon, 26 Jun 2006 11:56:04 +0000 (+0200)
Subject: [PATCH] x86_64: Use local APIC ID from local APIC instead of CPUID
X-Git-Tag: v2.6.18-rc1~612^2~81
X-Git-Url: http://pileus.org/git/?a=commitdiff_plain;h=0f4fdb7fba0b3ec66df39d0e743e701404161fb8;p=~andy%2Flinux

[PATCH] x86_64: Use local APIC ID from local APIC instead of CPUID

vSMPowered systems use apic_cluster too.  Forcing apic_physflat works
on these systems too, but only if we change phys_pkg_id to use
hard_smp_prcoessor_id() instead of cpuid_ebx.  I am guessing other
multichassi cluster systems would need this too.

Signed-off-by: ravikiran thirumalai <kiran@scalex86.org>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/arch/x86_64/kernel/genapic_flat.c b/arch/x86_64/kernel/genapic_flat.c
index 1a2ab825be9..c66ca7b1d31 100644
--- a/arch/x86_64/kernel/genapic_flat.c
+++ b/arch/x86_64/kernel/genapic_flat.c
@@ -108,10 +108,7 @@ static unsigned int flat_cpu_mask_to_apicid(cpumask_t cpumask)
 
 static unsigned int phys_pkg_id(int index_msb)
 {
-	u32 ebx;
-
-	ebx = cpuid_ebx(1);
-	return ((ebx >> 24) & 0xFF) >> index_msb;
+	return hard_smp_processor_id() >> index_msb;
 }
 
 struct genapic apic_flat =  {