[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>

1 files changed, 1 insertions, 4 deletions

diff --git a/arch/x86_64/kernel/genapic_flat.c b/arch/x86_64/kernel/genapic_flat.c
index 1a2ab825be98..c66ca7b1d31a 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 =  {