posix-cpu-timers: Cleanup the firing logic

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The firing flag of a posix CPU timer is tristate:

  0: when the timer is not about to deliver a signal

  1: when the timer has expired, but the signal has not been delivered yet

 -1: when the timer was queued for signal delivery and a rearm operation
     raced against it and supressed the signal delivery.

This is a pointless exercise as this can be simply expressed with a
boolean. Only if set, the signal is delivered. This makes delete and rearm
consistent with the rest of the posix timers.

Convert firing to bool and fixup the usage sites accordingly and add
comments why the timer cannot be dequeued right away.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Link: https://lore.kernel.org/all/20241105064213.172848618@linutronix.de

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This commit is contained in:

Thomas Gleixner 2024-11-05 09:14:33 +01:00

parent b06b0345ff

commit bf635681c9

2 changed files with 25 additions and 11 deletions

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2

include/linux/posix-timers.h

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34

kernel/time/posix-cpu-timers.c

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