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[ Upstream commitc163e40af9] 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. Since135225a363timekeeping_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 Signed-off-by: Sasha Levin <sashal@kernel.org>