Messages in this thread | | | Date | Sun, 19 Feb 2012 20:20:31 +0800 | Subject | A problem with percpu variable cpu_number | From | Tao Jiang <> |
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Hi:
I've asked the question on kernelnewbies, no replies. So forward it here. Thank you.
---------- Forwarded message ---------- From: tao jiang <jiangtao.jit@gmail.com> Date: 2012/2/16 Subject: A problem with percpu variable cpu_number To: kernelnewbies <kernelnewbies@kernelnewbies.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
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