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    SubjectRe: [PATCH RFC/RFB] x86_64, i386: interrupt dispatch changes
    Jeremy Fitzhardinge wrote:
    > Andi Kleen wrote:
    >> ??? LOCK slowness is not because of the bus. And I know you know that
    >> Ingo, so I don't know why you wrote that bogosity above.
    >>
    >
    > Why are the accesses locked? Is it because it does an update of the
    > accessed bit in the descriptor? (We should be pre-setting them all
    > anyway.)
    >

    It is, but the locked access is unconditional. Similar to any other
    read/modify/write transaction -- the write is required to release the lock.

    -hpa


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