From: Zwane Mwaikambo Up to date I've been using the GS value to determine the processor number in dumps from show_regs, however this can be cumbersome to do if you don't have the vmlinux to verify with the address of cpu_pda, how about the following? I considered using hard_smp_processor_id for robustness but we already dereference current so we're already relying on MSR_GS_BASE being sane. Signed-off-by: Zwane Mwaikambo Cc: Andi Kleen Signed-off-by: Andrew Morton --- arch/x86_64/kernel/process.c | 1 + 1 files changed, 1 insertion(+) diff -puN arch/x86_64/kernel/process.c~x86_64-print-processor-number-in-show_regs arch/x86_64/kernel/process.c --- devel/arch/x86_64/kernel/process.c~x86_64-print-processor-number-in-show_regs 2005-07-16 13:38:08.000000000 -0700 +++ devel-akpm/arch/x86_64/kernel/process.c 2005-07-16 13:38:08.000000000 -0700 @@ -310,6 +310,7 @@ void __show_regs(struct pt_regs * regs) void show_regs(struct pt_regs *regs) { + printk("CPU %d:", smp_processor_id()); __show_regs(regs); show_trace(®s->rsp); } _