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    SubjectRe: Bottom Handles/soft irqs/timer interrupts/SMP .....
    On Fri, Sep 29, 2000 at 11:41:57PM +1100, Anton Blanchard wrote:
    > On sparc blocking interrupts does not block the reception of cpu cross
    > calls, so you cannot do anything like grab locks within a called function.

    So if you can't handle the IPI when you get it, set a flag and trap on the
    next sti. It certainly sounds like broken hardware to me and it can be
    worked around, can't it ?

    Maybe we should have a version of smp_call_function that uses softirqs
    (unless those are broken on sparc as well ;) ) and use the old version for
    the very performance-sensitive parts only ?

    Putting all tests for smp_call_function in the timer interrupt code doesn't
    make any sense at all to me.

    Philipp Rumpf
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