posix-cpu-timers: Get rid of zero checks

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Deactivation of the expiry cache is done by setting all clock caches to
0. That requires to have a check for zero in all places which update the
expiry cache:

	if (cache == 0 || new < cache)
		cache = new;

Use U64_MAX as the deactivated value, which allows to remove the zero
checks when updating the cache and reduces it to the obvious check:

	if (new < cache)
		cache = new;

This also removes the weird workaround in do_prlimit() which was required
to convert a RLIMIT_CPU value of 0 (immediate expiry) to 1 because handing
in 0 to the posix CPU timer code would have effectively disarmed it.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Link: https://lkml.kernel.org/r/20190821192922.275086128@linutronix.de

...

This commit is contained in:

Thomas Gleixner 2019-08-21 21:09:19 +02:00

parent 24db4dd90d

commit 2bbdbdae05

3 changed files with 20 additions and 34 deletions

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7

include/linux/posix-timers.h

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9

kernel/sys.c

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38

kernel/time/posix-cpu-timers.c

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