In commit acb04058de49458010c44bb35b849d45113fd668 ("sched/clock: Fix hotplug crash") the parisc code gained a call to this function.
However the prototype for it is within HAVE_UNSTABLE_SCHED_CLOCK 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. Fixes: acb04058de49 ("sched/clock: Fix hotplug crash") Cc: Peter Zijlstra (Intel) <pet...@infradead.org> Cc: Ingo Molnar <mi...@kernel.org> Signed-off-by: Paul Gortmaker <paul.gortma...@windriver.com> --- include/linux/sched.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/include/linux/sched.h b/include/linux/sched.h index 43c4840c0485..c8a257fde056 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -2498,6 +2498,10 @@ static inline void sched_clock_tick(void) { } +static inline void clear_sched_clock_stable(void) +{ +} + static inline void sched_clock_idle_sleep_event(void) { } -- 2.11.0