4.16-stable review patch. If anyone has any objections, please let me know. ------------------ From: Peter Zijlstra <peterz@xxxxxxxxxxxxx> commit 5b9e886a4af97574ca3ce1147f35545da0e7afc7 upstream. A number of places relies on list_empty(&cs->wd_list), however the list_head does not get initialized. Do so upon registration, such that thereafter it is possible to rely on list_empty() correctly reflecting the list membership status. Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx> Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Tested-by: Diego Viola <diego.viola@xxxxxxxxx> Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> Cc: stable@xxxxxxxxxxxxxxx Cc: len.brown@xxxxxxxxx Cc: rjw@xxxxxxxxxxxxx Cc: rui.zhang@xxxxxxxxx Link: https://lkml.kernel.org/r/20180430100344.472662715@xxxxxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- kernel/time/clocksource.c | 2 ++ 1 file changed, 2 insertions(+) --- a/kernel/time/clocksource.c +++ b/kernel/time/clocksource.c @@ -332,6 +332,8 @@ static void clocksource_resume_watchdog( static void clocksource_enqueue_watchdog(struct clocksource *cs) { + INIT_LIST_HEAD(&cs->wd_list); + if (cs->flags & CLOCK_SOURCE_MUST_VERIFY) { /* cs is a clocksource to be watched. */ list_add(&cs->wd_list, &watchdog_list);
