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c54be90b28
This reworks timer_enter_waiting() in a couple of ways in order to clean it up a bit and fix #5629. Most importantly, we previously we initialized ts_monotonic to either the current time in CLOCK_MONOTONIC or in CLOCK_BOOTTIME, depending on t->wake_system. Then given specific conditions we'd use this time as base for our timers. And afterwards, if t->wake_system was on we'd convetr the resulting value from CLOCK_MONOTONIC to CLOCK_BOOTTIME again — which of course is wrong since we already were in CLOCK_BOOTTIME! This fixes this logic, by using a triple timestamp so that we always have the right base around, and initially only calculate in CLOCK_MONOTONIC and only convert as last step. Conversion between the clocks is now done with the generic usec_shift_clock(), and additions via usec_add() making these calculations a bit safer. Fixes: #5629
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