[PATCH] sched/fair: Fix kernel build warning in test_idle_cores() for !SMT NUMA

[Lukasz Luba]

Fix kernel build warning in kernel/sched/fair.c when CONFIG_SCHED_SMT is
not set and CONFIG_NUMA_BALANCING is set.

kernel/sched/fair.c:1524:20: warning: âtest_idle_coresâ declared âstaticâ but never defined [-Wunused-function]

Fixes: ff7db0bf24db9 ("sched/numa: Prefer using an idle CPU as a migration target instead of comparing tasks")
Signed-off-by: Lukasz Luba <lukasz.luba@xxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Vincent Guittot <vincent.guittot@xxxxxxxxxx> (SCHED_NORMAL)
Cc: Dietmar Eggemann <dietmar.eggemann@xxxxxxx> (SCHED_NORMAL)
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
---

It's on top of tip [1] master branch (which has a merge of sched/urgent).

[1] https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git

 kernel/sched/fair.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 4b5d5e5e701e..4441003b1ad1 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -1520,8 +1520,10 @@ static inline bool is_core_idle(int cpu)
 	return true;
 }
 
+#ifdef CONFIG_SCHED_SMT
 /* Forward declarations of select_idle_sibling helpers */
 static inline bool test_idle_cores(int cpu, bool def);
+#endif
 
 struct task_numa_env {
 	struct task_struct *p;
-- 
2.17.1