linux-kernel - [PATCH] sched/uclamp: fix building without cgroup

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Date:   Wed, 18 Sep 2019 21:59:43 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Patrick Bellasi <patrick.bellasi@....com>,
        Michal Koutny <mkoutny@...e.com>, Tejun Heo <tj@...nel.org>,
        Alessio Balsini <balsini@...roid.com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Joel Fernandes <joelaf@...gle.com>,
        Morten Rasmussen <morten.rasmussen@....com>,
        Paul Turner <pjt@...gle.com>,
        Quentin Perret <quentin.perret@....com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Steve Muckle <smuckle@...gle.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Todd Kjos <tkjos@...gle.com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org
Subject: [PATCH] sched/uclamp: fix building without cgroup

The css_task_iter interfaces are defined conditionally and
cause build failures when used in other configurations:

kernel/sched/core.c:1081:23: error: variable has incomplete type 'struct css_task_iter'
kernel/sched/core.c:1084:2: error: implicit declaration of function 'css_task_iter_start' [-Werror,-Wimplicit-function-declaration]
kernel/sched/core.c:1085:14: error: implicit declaration of function 'css_task_iter_next' [-Werror,-Wimplicit-function-declaration]
kernel/sched/core.c:1091:2: error: implicit declaration of function 'css_task_iter_end' [-Werror,-Wimplicit-function-declaration]

As this code is unused anyway in that configuration, just put
it into the same #ifdef. This also avoids possible warnings
about unused inline functions.

Fixes: babbe170e053 ("sched/uclamp: Update CPU's refcount on TG's clamp changes")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 kernel/sched/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index f9a1346a5fa9..f25e3949a5ba 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1043,6 +1043,7 @@ static inline void uclamp_rq_dec(struct rq *rq, struct task_struct *p)
 		uclamp_rq_dec_id(rq, p, clamp_id);
 }
 
+#ifdef CONFIG_UCLAMP_TASK_GROUP
 static inline void
 uclamp_update_active(struct task_struct *p, enum uclamp_id clamp_id)
 {
@@ -1091,7 +1092,6 @@ uclamp_update_active_tasks(struct cgroup_subsys_state *css,
 	css_task_iter_end(&it);
 }
 
-#ifdef CONFIG_UCLAMP_TASK_GROUP
 static void cpu_util_update_eff(struct cgroup_subsys_state *css);
 static void uclamp_update_root_tg(void)
 {
-- 
2.20.0