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    SubjectRe: no DRQ after issuing WRITE was Re: 2.4.23-uv3 patch set released


    On Tue, 30 Dec 2003, Rob Love wrote:
    >
    > Anyhow, if interrupts are disabled, preemption should be disabled (we
    > check for that condition in both preempt_schedule() and
    > return_from_intr).

    Interrupts are _not_ disabled here, very much on purpose. If they were,
    then "jiffies" wouldn't update, and the timeouts wouldn't work.

    This is what that _stupid_ "local_irq_set()" function does: it saves the
    old irq masking state, and then it enables it.

    The whole concept doesn't make any sense. If you enable interrupts, there
    is little point in saving the callers irq mask, since it already got
    deflated.

    Linus
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