in x86_64 smp systems, a regression was introduced a few days after 2.6.23,

on its way to 2.6.23. Bisection leads me to commit

92cb7612aee39642d109b8d935ad265e602c0563.
The problem is that the output of 'cat /proc/cpuinfo' shows 0 as the id of

all cpus of a smp system. As far as I know, this only happens on x86_64

systems.
This problem was first noticed by Ravikiran. A simple patch follows
Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com>

Cc: Ravikiran Thirumalai <kiran@scalemp.com>

---

 arch/x86/kernel/setup_64.c |    1 -

 1 files changed, 0 insertions(+), 1 deletions(-)
diff --git a/arch/x86/kernel/setup_64.c b/arch/x86/kernel/setup_64.c

index 0f0d9d4..eb41c99 100644

--- a/arch/x86/kernel/setup_64.c

+++ b/arch/x86/kernel/setup_64.c

@@ -858,7 +858,6 @@ void __cpuinit early_identify_cpu(struct cpuinfo_x86 *c)
 #ifdef CONFIG_SMP

 	c->phys_proc_id = (cpuid_ebx(1) >> 24) & 0xff;

-	c->cpu_index = 0;

 #endif

 }
--

1.4.4.2
-

oops, thanks for tracking this down!
Acked-by: Ingo Molnar <mingo@elte.hu>
	Ingo

-