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    SubjectRe: [PATCH UPDATED#3 04/16] x86: setup_local_APIC() must always be called with preemption disabled
    On 12/09/2010 10:56 PM, Thomas Gleixner wrote:
    > On Thu, 9 Dec 2010, 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.
    > AFAICT, this one is completely unrelated to that NUMA cleanup, right ?
    > So this can be applied independent and should never have been part of
    > that NUMA series in the first place.

    Originally, it was a trivial prep patch. Anyways, I'll push it
    to the top of the series so that it can be taken separately.



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