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156677ea10
[ Upstream commit e895f8e29119c8c966ea794af9e9100b10becb88 ]
When testing softirq based hrtimers on an ARM32 board, with high resolution
mode and NOHZ inactive, softirq based hrtimers fail to expire after being
moved away from an offline CPU:
CPU0 CPU1
hrtimer_start(..., HRTIMER_MODE_SOFT);
cpu_down(CPU1) ...
hrtimers_cpu_dying()
// Migrate timers to CPU0
smp_call_function_single(CPU0, returgger_next_event);
retrigger_next_event()
if (!highres && !nohz)
return;
As retrigger_next_event() is a NOOP when both high resolution timers and
NOHZ are inactive CPU0's hrtimer_cpu_base::softirq_expires_next is not
updated and the migrated softirq timers never expire unless there is a
softirq based hrtimer queued on CPU0 later.
Fix this by removing the hrtimer_hres_active() and tick_nohz_active() check
in retrigger_next_event(), which enforces a full update of the CPU base.
As this is not a fast path the extra cost does not matter.
[ tglx: Massaged change log ]
Fixes:
|
||
|---|---|---|
| .. | ||
| alarmtimer.c | ||
| clockevents.c | ||
| clocksource-wdtest.c | ||
| clocksource.c | ||
| hrtimer.c | ||
| itimer.c | ||
| jiffies.c | ||
| Kconfig | ||
| Makefile | ||
| namespace.c | ||
| ntp_internal.h | ||
| ntp.c | ||
| posix-clock.c | ||
| posix-cpu-timers.c | ||
| posix-stubs.c | ||
| posix-timers.c | ||
| posix-timers.h | ||
| sched_clock.c | ||
| test_udelay.c | ||
| tick-broadcast-hrtimer.c | ||
| tick-broadcast.c | ||
| tick-common.c | ||
| tick-internal.h | ||
| tick-legacy.c | ||
| tick-oneshot.c | ||
| tick-sched.c | ||
| tick-sched.h | ||
| time_test.c | ||
| time.c | ||
| timeconst.bc | ||
| timeconv.c | ||
| timecounter.c | ||
| timekeeping_debug.c | ||
| timekeeping_internal.h | ||
| timekeeping.c | ||
| timekeeping.h | ||
| timer_list.c | ||
| timer.c | ||
| vsyscall.c | ||