timekeeping: Always check for negative motion

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clocksource_delta() has two variants. One with a check for negative motion,
which is only selected by x86. This is a historic leftover as this function
was previously used in the time getter hot paths.

Since 135225a363 timekeeping_cycles_to_ns() has unconditional protection
against this as a by-product of the protection against 64bit math overflow.

clocksource_delta() is only used in the clocksource watchdog and in
timekeeping_advance(). The extra conditional there is not hurting anyone.

Remove the config option and unconditionally prevent negative motion of the
readout.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: John Stultz <jstultz@google.com>
Link: https://lore.kernel.org/all/20241031120328.599430157@linutronix.de

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Thomas Gleixner 2024-10-31 13:04:08 +01:00

parent d44d26987b

commit c163e40af9

3 changed files with 0 additions and 13 deletions

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1

arch/x86/Kconfig

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5

kernel/time/Kconfig

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7

kernel/time/timekeeping_internal.h

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