Xiongfeng Wang 4a19dac7ac hrtimers: Unconditionally update target CPU base after offline timer migration ... [ 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: 5c0930ccaa ("hrtimers: Push pending hrtimers away from outgoing CPU earlier") Co-developed-by: Frederic Weisbecker <frederic@kernel.org> Signed-off-by: Frederic Weisbecker <frederic@kernel.org> Signed-off-by: Xiongfeng Wang <wangxiongfeng2@huawei.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lore.kernel.org/all/20250805081025.54235-1-wangxiongfeng2@huawei.com Signed-off-by: Sasha Levin <sashal@kernel.org>		2025-09-19 16:29:59 +02:00
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alarmtimer.c
clockevents.c
clocksource-wdtest.c
clocksource.c	clocksource: Fix the CPUs' choice in the watchdog per CPU verification	2025-06-27 11:07:31 +01:00
hrtimer.c	hrtimers: Unconditionally update target CPU base after offline timer migration	2025-09-19 16:29:59 +02:00
itimer.c
jiffies.c
Kconfig
Makefile
namespace.c
ntp_internal.h
ntp.c	ntp: Remove invalid cast in time offset math	2024-12-14 19:54:26 +01:00
posix-clock.c
posix-cpu-timers.c	posix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del()	2025-06-27 11:07:24 +01:00
posix-stubs.c
posix-timers.c	posix-timers: Add cond_resched() to posix_timer_add() search loop	2025-06-04 14:40:06 +02:00
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_list: Don't use %pK through printk()	2025-06-04 14:40:07 +02:00
timer.c
vsyscall.c