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SubjectRe: 2.6.12 hangs on boot

Can you please test if this patch fixes it?


Don't compare linux processor index with APICID

Fixes boot up lockups on some machines where CPU apic ids
don't start with 0

Signed-off-by: Andi Kleen <>

Index: linux/arch/x86_64/kernel/smpboot.c
--- linux.orig/arch/x86_64/kernel/smpboot.c
+++ linux/arch/x86_64/kernel/smpboot.c
@@ -211,7 +211,7 @@ static __cpuinit void sync_master(void *
unsigned long flags, i;

- if (smp_processor_id() != boot_cpu_id)
+ if (smp_processor_id() != 0)

go[MASTER] = 0;

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