timers/nohz: Switch to ONESHOT_STOPPED in the low-res handler when the tick is stopped

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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

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Nicholas Piggin 2022-04-23 00:14:46 +10:00 • committed by Thomas Gleixner

parent ce8abf340e

commit 62c1256d54

1 changed files with 10 additions and 2 deletions

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kernel/time/tick-sched.c

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