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Pull clocksource watchdog updates from Paul McKenney: - Avoid accidental unstable marking of clocksources by rejecting clocksource measurements where the source of the skew is the delay reading reference clocksource itself. This change avoids many of the current false positives caused by epic cache-thrashing workloads. - Reduce the default clocksource_watchdog() retries to 2, thus offsetting the increased overhead due to #1 above rereading the reference clocksource. Link: https://lore.kernel.org/lkml/20220105001723.GA536708@paulmck-ThinkPad-P17-Gen-1