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Subject[PATCH v2] sched/clock: print a log when the sched clock is marked unstable
When the sched clock transitions from stable to unstable and
vice versa, a kernel log is printed. When the sched clock
is marked explicitly as unstable, make __clear_sched_clock_stable()
emit a warning log. It is useful for example in understanding
why a certain feature like NOHZ that depends on availability of a
stable sched clock, is not available.

Signed-off-by: Ani Sinha <>
kernel/sched/clock.c | 1 +
1 file changed, 1 insertion(+)

V1: original patch
v2: print pr_warn from __clear_sched_clock_stable instead. Commit log
updated with proper prefix and wording.

diff --git a/kernel/sched/clock.c b/kernel/sched/clock.c
index c2b2859ddd82..99484fec0335 100644
--- a/kernel/sched/clock.c
+++ b/kernel/sched/clock.c
@@ -183,6 +183,7 @@ static void __clear_sched_clock_stable(void)

+ pr_warn("sched_clock: Marking unstable.\n");

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