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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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