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Date: Sun, 19 Feb 2012 20:20:31 +0800 From: Tao Jiang <jiangtao.jit@...il.com> To: linux-kernel@...r.kernel.org Subject: A problem with percpu variable cpu_number Hi: I've asked the question on kernelnewbies, no replies. So forward it here. Thank you. ---------- Forwarded message ---------- From: tao jiang <jiangtao.jit@...il.com> Date: 2012/2/16 Subject: A problem with percpu variable cpu_number To: kernelnewbies <kernelnewbies@...nelnewbies.org> Hi : At the beginning of start_kernel() -- init/main.c boot_cpu_init() is called and in boot_cpu_init() will call smp_processor_id() it's a macro and it will be expanded as (percpu_read(cpu_number)) and so on but i noticed that it's before setup_per_cpu_areas() in start_kernel() is that mean the percpu areas hadn't be initialized yet but why smp_processor_id() could be called before setup_per_cpu_areas() Thank you. --------------- jiangtao -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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