kernel_samsung_a53x/kernel/time
Oleg Nesterov 0d21b4485a tick/nohz_full: Don't abuse smp_call_function_single() in tick_setup_device()
commit 07c54cc5988f19c9642fd463c2dbdac7fc52f777 upstream.

After the recent commit 5097cbcb38e6 ("sched/isolation: Prevent boot crash
when the boot CPU is nohz_full") the kernel no longer crashes, but there is
another problem.

In this case tick_setup_device() calls tick_take_do_timer_from_boot() to
update tick_do_timer_cpu and this triggers the WARN_ON_ONCE(irqs_disabled)
in smp_call_function_single().

Kill tick_take_do_timer_from_boot() and just use WRITE_ONCE(), the new
comment explains why this is safe (thanks Thomas!).

Fixes: 08ae95f4fd3b ("nohz_full: Allow the boot CPU to be nohz_full")
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20240528122019.GA28794@redhat.com
Link: https://lore.kernel.org/all/20240522151742.GA10400@redhat.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2024-11-19 14:19:05 +01:00
..
alarmtimer.c
clockevents.c
clocksource.c
hrtimer.c hrtimer: Ignore slack time for RT tasks in schedule_hrtimeout_range() 2024-11-18 12:13:34 +01:00
itimer.c
jiffies.c
Kconfig
Makefile
namespace.c
ntp.c
ntp_internal.h
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/nohz_full: Don't abuse smp_call_function_single() in tick_setup_device() 2024-11-19 14:19:05 +01:00
tick-internal.h
tick-oneshot.c
tick-sched.c
tick-sched.h
time.c
timeconst.bc
timeconv.c
timecounter.c
timekeeping.c timekeeping: Fix cross-timestamp interpolation for non-x86 2024-11-19 08:44:37 +01:00
timekeeping.h
timekeeping_debug.c
timekeeping_internal.h
timer.c timers: Rename del_timer_sync() to timer_delete_sync() 2024-11-19 09:22:14 +01:00
timer_list.c
vsyscall.c