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Subject[tip:sched/core] sched/clock: Add dummy clear_sched_clock_stable() stub function
Commit-ID:  733ce725aa4bfa9063be053bfe7f4597d76f0dd1
Author: Paul Gortmaker <>
AuthorDate: Fri, 27 Jan 2017 12:38:16 -0500
Committer: Ingo Molnar <>
CommitDate: Wed, 1 Feb 2017 11:01:29 +0100

sched/clock: Add dummy clear_sched_clock_stable() stub function

In commit:

acb04058de494 ("sched/clock: Fix hotplug crash")

the PARISC code gained a call to this function.

However the prototype for it is within a CONFIG_HAVE_UNSTABLE_SCHED_CLOCK=y
#ifdef/#endif. That, combined with this:

arch/parisc/Kconfig: select HAVE_UNSTABLE_SCHED_CLOCK if SMP

means that PARISC can have it either enabled or disabled, resulting
in the following build fail:

arch/parisc/kernel/setup.c:180:2: error: implicit declaration of
function 'clear_sched_clock_stable' [-Werror=implicit-function-declaration]

Add a no-op stub for the non-SMP case to prevent this.

Signed-off-by: Paul Gortmaker <>
Signed-off-by: Peter Zijlstra (Intel) <>
Cc: Linus Torvalds <>
Cc: Mike Galbraith <>
Cc: Peter Zijlstra <>
Cc: Thomas Gleixner <>
Fixes: acb04058de49 ("sched/clock: Fix hotplug crash")
Signed-off-by: Ingo Molnar <>
include/linux/sched.h | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index d176454..e2ed46d 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -2511,6 +2511,10 @@ static inline void sched_clock_tick(void)

+static inline void clear_sched_clock_stable(void)
static inline void sched_clock_idle_sleep_event(void)
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