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    SubjectRe: timer_bh behaviour incorrect for 2.2.13?

    On Thu, 9 Dec 1999, William Montgomery wrote:

    > > there is one race here that is subtle: if a bottom-half is marked _while_
    > > do_bottom_half is executing, then do_bottom_half might not notice this,
    > > and we miss the event.

    > I will try your patch but it seems unlikely since run_bottom_halves
    > is protected by __sti(); / __cli();. Since interrupts are disabled
    > I dont see how a timer IRQ could occur while run_bottom_halves is
    > executing.

    bottom halves can still enable interrupts, so it can indeed happen
    (more so on SMP) that a BH gets marked active while a BH is running.

    > Sounds like Andrea also has some idea about what might be happening.

    no, he noticed the same race.

    -- mingo


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