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When global timer used at SMP system, update nextevent field on BSP before

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sending IPI to other CPUs. Otherwise, other CPUs will try to honor stale
value, programming timer for zero interval. If timer is fast enough,
it caused extra interrupt before timer correctly reprogrammed by BSP.
This commit is contained in:
mav 2010-09-18 07:18:30 +00:00
parent 84d6709378
commit a168297469
1 changed files with 4 additions and 4 deletions
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8
sys/kern/kern_clocksource.c
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@ -335,15 +335,15 @@ timercb(struct eventtimer *et, void *arg)
bcast = 0;
if ((et->et_flags & ET_FLAGS_PERCPU) == 0 && smp_started) {
CPU_FOREACH(cpu) {
if (curcpu == cpu)
continue;
state = DPCPU_ID_PTR(cpu, timerstate);
ET_HW_LOCK(state);
state->now = now;
if (bintime_cmp(&now, &state->nextevent, >=)) {
state->nextevent.sec++;
state->ipi = 1;
bcast = 1;
if (curcpu != cpu) {
state->ipi = 1;
bcast = 1;
}
}
ET_HW_UNLOCK(state);
}