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Code Issues Releases Wiki Activity

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: 2c756feb18 ("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
This commit is contained in:
Peter Hilber 2023-12-18 08:38:39 +01:00 committed by Thomas Gleixner
parent c92a7eb6c6
commit 84dccadd3e
1 changed files with 1 additions and 1 deletions
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2
kernel/time/timekeeping.c
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@ -1186,7 +1186,7 @@ static bool cycle_between(u64 before, u64 test, u64 after)
{
if (test > before && test < after)
return true;
if (test < before && before > after)
if (before > after && (test > before || test < after))
return true;
return false;
}