linux-kernel - [PATCH] sched: fix an unused function "node

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Date:   Tue, 17 Sep 2019 10:34:54 -0400
From:   Qian Cai <cai@....pw>
To:     mingo@...hat.com, peterz@...radead.org
Cc:     juri.lelli@...hat.com, vincent.guittot@...aro.org,
        dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
        mgorman@...e.de, linux-kernel@...r.kernel.org,
        Qian Cai <cai@....pw>
Subject: [PATCH] sched: fix an unused function "node_cpu" warning

Clang reports a warning,

kernel/locking/osq_lock.c:25:19: warning: unused function 'node_cpu'
[-Wunused-function]

due to osq_lock() calls vcpu_is_preempted(node_cpu(node->prev))), but
vcpu_is_preempted() is compiled away. Fix it by converting the dummy
vcpu_is_preempted() from a macro to a proper static inline function.

Signed-off-by: Qian Cai <cai@....pw>
---
 include/linux/sched.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index f0edee94834a..e2e91960d79f 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1856,7 +1856,10 @@ static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
  * running or not.
  */
 #ifndef vcpu_is_preempted
-# define vcpu_is_preempted(cpu)	false
+static inline bool vcpu_is_preempted(int cpu)
+{
+	return false;
+}
 #endif
 
 extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
-- 
1.8.3.1