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nohz: no softirq pending warnings for offline cpus 

Impact: remove false positive warning

After a cpu was taken down during cpu hotplug (read: disabled for interrupts)
it still might have pending softirqs. However take_cpu_down makes sure
that the idle task will run next instead of ksoftirqd on the taken down cpu.
The idle task will call tick_nohz_stop_sched_tick which might warn about
pending softirqs just before the cpu kills itself completely.

However the pending softirqs on the dead cpu aren't a problem because they
will be moved to an online cpu during CPU_DEAD handling.

So make sure we warn only for online cpus.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
hifive-unleashed-5.1
Heiko Carstens 2008-12-11 17:04:11 +01:00 committed by Ingo Molnar
parent 6c34bc2976
commit fa116ea35e
1 changed files with 1 additions and 1 deletions
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2
kernel/time/tick-sched.c
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@ -247,7 +247,7 @@ void tick_nohz_stop_sched_tick(int inidle)
if (need_resched())
goto end;
if (unlikely(local_softirq_pending())) {
if (unlikely(local_softirq_pending() && cpu_online(cpu))) {
static int ratelimit;
if (ratelimit < 10) {