[PATCH 4.12 25/27] sched/numa: Hide numa_wake_affine() from UP build

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

4.12-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Thomas Gleixner <tglx@linutronix.de>

commit ff801b716effd652f420204eddb36f6e4a716819 upstream.

Stephen reported the following build warning in UP:

kernel/sched/fair.c:2657:9: warning: 'struct sched_domain' declared inside
parameter list
         ^
/home/sfr/next/next/kernel/sched/fair.c:2657:9: warning: its scope is only this
definition or declaration, which is probably not what you want

Hide the numa_wake_affine() inline stub on UP builds to get rid of it.

Fixes: 3fed382b46ba ("sched/numa: Implement NUMA node level wake_affine()")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Rik van Riel <riel@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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

--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -2651,12 +2651,14 @@ static inline void account_numa_dequeue(
 {
 }
 
+#ifdef CONFIG_SMP
 static inline bool numa_wake_affine(struct sched_domain *sd,
 				    struct task_struct *p, int this_cpu,
 				    int prev_cpu, int sync)
 {
 	return true;
 }
+#endif /* !SMP */
 #endif /* CONFIG_NUMA_BALANCING */
 
 static void