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The comments related to raw monotonic timestamps for the various snapshot mechanisms in code and struct documentation are ambiguous. They reference them as CLOCK_MONOTONIC_RAW timestamps, but with the arrival of AUX clocks that's not longer correct. The raw monotonic timestamps only represent CLOCK_MONOTONIC_RAW for the system time clock IDs, i.e. REALTIME, MONOTONIC, BOOTTIME, TAI. For AUX clocks they refer to the monotonic raw clock which is related to the individual AUX clocks. These monotonic raw timestamps have the same conversion factor as CLOCK_MONOTONIC_RAW, but differ from that by an offset: MONORAW(AUX$N) = MONORAW(SYSTEM) + OFFSET(AUX$N) The offset is established when a AUX clock is enabled and stays constant for the lifetime of the AUX clock. Update the comments so they reflect reality. Reported-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@kernel.org> Reviewed-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Link: https://patch.msgid.link/87wlv9k3wz.ffs@fw13 |
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