linux-kernel - [PATCH] sched/fair: Fix kernel build warning in test_idle

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Date:   Thu, 27 Feb 2020 11:00:53 +0000
From:   Lukasz Luba <lukasz.luba@....com>
To:     linux-kernel@...r.kernel.org
Cc:     mingo@...hat.com, peterz@...radead.org, vincent.guittot@...aro.org,
        dietmar.eggemann@....com, lukasz.luba@....com,
        mgorman@...hsingularity.net
Subject: [PATCH] sched/fair: Fix kernel build warning in test_idle_cores() for !SMT NUMA

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: ‘test_idle_cores’ declared ‘static’ 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@....com>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Vincent Guittot <vincent.guittot@...aro.org> (SCHED_NORMAL)
Cc: Dietmar Eggemann <dietmar.eggemann@....com> (SCHED_NORMAL)
Cc: Mel Gorman <mgorman@...hsingularity.net>
---

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