]> git.baikalelectronics.ru Git - kernel.git/commit
timers/nohz: Switch to ONESHOT_STOPPED in the low-res handler when the tick is stopped
authorNicholas Piggin <npiggin@gmail.com>
Fri, 22 Apr 2022 14:14:46 +0000 (00:14 +1000)
committerThomas Gleixner <tglx@linutronix.de>
Mon, 25 Apr 2022 12:45:22 +0000 (14:45 +0200)
commit37ab01140d1ef9eb43de34b4ae23e6b4a56e0a75
tree76b7ac3839b9382128b1a0b69eee7f527d95c77b
parentf1872fc467ab2c51d59a21f618b581ca61c76aa4
timers/nohz: Switch to ONESHOT_STOPPED in the low-res handler when the tick is stopped

When tick_nohz_stop_tick() stops the tick and high resolution timers are
disabled, then the clock event device is not put into ONESHOT_STOPPED
mode. This can lead to spurious timer interrupts with some clock event
device drivers that don't shut down entirely after firing.

Eliminate these by putting the device into ONESHOT_STOPPED mode at points
where it is not being reprogrammed. When there are no timers active, then
tick_program_event() with KTIME_MAX can be used to stop the device. When
there is a timer active, the device can be stopped at the next tick (any
new timer added by timers will reprogram the tick).

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20220422141446.915024-1-npiggin@gmail.com
kernel/time/tick-sched.c