timekeeping: Fix cross-timestamp interpolation on counter wrap
authorPeter Hilber <peter.hilber@opensynergy.com>
Mon, 18 Dec 2023 07:38:39 +0000 (08:38 +0100)
committerThomas Gleixner <tglx@linutronix.de>
Mon, 19 Feb 2024 11:18:51 +0000 (12:18 +0100)
commit84dccadd3e2a3f1a373826ad71e5ced5e76b0c00
treee7e33f6eff8e90ac1227e3680c7ac1b128a0e4c9
parentc92a7eb6c642812fb08851e580973c3b83e0227c
timekeeping: Fix cross-timestamp interpolation on counter wrap

cycle_between() decides whether get_device_system_crosststamp() will
interpolate for older counter readings.

cycle_between() yields wrong results for a counter wrap-around where after
< before < test, and for the case after < test < before.

Fix the comparison logic.

Fixes: 2c756feb18d9 ("time: Add history to cross timestamp interface supporting slower devices")
Signed-off-by: Peter Hilber <peter.hilber@opensynergy.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: John Stultz <jstultz@google.com>
Link: https://lore.kernel.org/r/20231218073849.35294-2-peter.hilber@opensynergy.com
kernel/time/timekeeping.c