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um: time-travel: avoid multiple identical propagations

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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>
This commit is contained in:
Johannes Berg 2020-12-04 12:34:34 +01:00 committed by Richard Weinberger
parent 3c6ac61bc9
commit 58b09f6869
1 changed files with 6 additions and 0 deletions
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6
arch/um/kernel/time.c
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@ -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);