Commit 58b09f68 authored Dec 04, 2020 by Johannes Berg Committed by Richard Weinberger Dec 13, 2020

um: time-travel: avoid multiple identical propagations



If there is some kind of interrupt negotation or such then
it may happen that we send an update message multiple times,
avoid that in the interest of efficiency by storing the last
transmitted value and only sending a new update if it's not
the same as the last update.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Richard Weinberger <richard@nod.at>

parent 3c6ac61b

arch/um/kernel/time.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -190,7 +190,13 @@ static void time_travel_ext_update_request(unsigned long long time)

		void __time_travel_propagate_time(void)
		{
		static unsigned long long last_propagated;

		if (last_propagated == time_travel_time)
		return;

		time_travel_ext_req(UM_TIMETRAVEL_UPDATE, time_travel_time);
		last_propagated = time_travel_time;
		}
		EXPORT_SYMBOL_GPL(__time_travel_propagate_time);

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