linux-kernel - [PATCH] sched/numa: fix build without CONFIG_NUMA

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Date:   Wed, 28 Jun 2017 22:05:09 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Morten Rasmussen <morten.rasmussen@....com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Rik van Riel <riel@...hat.com>, linux-kernel@...r.kernel.org
Subject: [PATCH] sched/numa: fix build without CONFIG_NUMA_BALANCING

I ran into a build error:

kernel/sched/fair.c:2655:44: error: 'struct sched_domain' declared inside parameter list will not be visible outside of this definition or declaration [-Werror]

Adding a forward declaration for the struct name is sufficient
to avoid it.

Fixes: 3fed382b46ba ("sched/numa: Implement NUMA node level wake_affine()")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 kernel/sched/fair.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 6f4f155adf5f..eea8f0b7d9c0 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -2652,6 +2652,7 @@ static inline void account_numa_dequeue(struct rq *rq, struct task_struct *p)
 {
 }
 
+struct sched_domain;
 static inline bool numa_wake_affine(struct sched_domain *sd,
 				    struct task_struct *p, int this_cpu,
 				    int prev_cpu, int sync)
-- 
2.9.0