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SubjectRe: [PATCH UPDATED#3 04/16] x86: setup_local_APIC() must always be called with preemption disabled
On Thu, 2010-12-09 at 11:47 +0100, Tejun Heo wrote:
> setup_local_APIC() is used to setup local APIC early during CPU
> initialization and already assumes that preemption is disabled on
> entry. However, The function unnecessarily disables and enables
> preemption and uses smp_processor_id() multiple times in and out of
> the nested preemption disabled section. This gives the wrong
> impression that the function might be able to handle being called with
> preemption enabled and/or migrated to another processor in the middle.
> Make it clear that the function is always called with preemption
> disabled, drop the confusing preemption disable block and call
> smp_processor_id() once at the beginning of the function.
> Signed-off-by: Tejun Heo <>
> Cc: Yinghai Lu <>
> Cc: Cyrill Gorcunov <>
> Cc: Pekka Enberg <>

Reviewed-by: Pekka Enberg <>

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