[tip: sched/urgent] sched/uclamp: Fix overzealous type replacement

[tip-bot2 for Valentin Schneider]

The following commit has been merged into the sched/urgent branch of tip:

Commit-ID:     16d6bbe7982e99f7f326ec6f088c0aaf85efa69d
Gitweb:        https://git.kernel.org/tip/16d6bbe7982e99f7f326ec6f088c0aaf85efa69d
Author:        Valentin Schneider <valentin.schneider@xxxxxxx>
AuthorDate:    Wed, 13 Nov 2019 16:53:34 
Committer:     Ingo Molnar <mingo@xxxxxxxxxx>
CommitterDate: Fri, 15 Nov 2019 11:02:19 +01:00

sched/uclamp: Fix overzealous type replacement

Some uclamp helpers had their return type changed from 'unsigned int' to
'enum uclamp_id' by commit:

  0413d7f33e60 ("sched/uclamp: Always use 'enum uclamp_id' for clamp_id values")

but it happens that some *actually* do return an unsigned int value. Those
are the helpers that return a utilization value: uclamp_rq_max_value() and
uclamp_eff_value(). Fix those up.

Note that this doesn't lead to any obj diff using a relatively recent
aarch64 compiler (8.3-2019.03). The current code of e.g. uclamp_eff_value()
already figures out that the return value is 11 bits (bits_per(1024)) and
doesn't seem to do anything funny. I'm still marking this as fixing the
above commit to be on the safe side.

Signed-off-by: Valentin Schneider <valentin.schneider@xxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Reviewed-by: Qais Yousef <qais.yousef@xxxxxxx>
Cc: Dietmar.Eggemann@xxxxxxx
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: patrick.bellasi@xxxxxxxxxx
Cc: qperret@xxxxxxxxxx
Cc: surenb@xxxxxxxxxx
Cc: tj@xxxxxxxxxx
Cc: vincent.guittot@xxxxxxxxxx
Fixes: 0413d7f33e60 ("sched/uclamp: Always use 'enum uclamp_id' for clamp_id values")
Link: https://lkml.kernel.org/r/20191113165334.14291-1-valentin.schneider@xxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
 kernel/sched/core.c  | 4 ++--
 kernel/sched/sched.h | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 44123b4..a4f76d3 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -853,7 +853,7 @@ static inline void uclamp_idle_reset(struct rq *rq, enum uclamp_id clamp_id,
 }
 
 static inline
-enum uclamp_id uclamp_rq_max_value(struct rq *rq, enum uclamp_id clamp_id,
+unsigned int uclamp_rq_max_value(struct rq *rq, enum uclamp_id clamp_id,
 				   unsigned int clamp_value)
 {
 	struct uclamp_bucket *bucket = rq->uclamp[clamp_id].bucket;
@@ -918,7 +918,7 @@ uclamp_eff_get(struct task_struct *p, enum uclamp_id clamp_id)
 	return uc_req;
 }
 
-enum uclamp_id uclamp_eff_value(struct task_struct *p, enum uclamp_id clamp_id)
+unsigned int uclamp_eff_value(struct task_struct *p, enum uclamp_id clamp_id)
 {
 	struct uclamp_se uc_eff;
 
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index c8870c5..49ed949 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -2309,7 +2309,7 @@ static inline void cpufreq_update_util(struct rq *rq, unsigned int flags) {}
 #endif /* CONFIG_CPU_FREQ */
 
 #ifdef CONFIG_UCLAMP_TASK
-enum uclamp_id uclamp_eff_value(struct task_struct *p, enum uclamp_id clamp_id);
+unsigned int uclamp_eff_value(struct task_struct *p, enum uclamp_id clamp_id);
 
 static __always_inline
 unsigned int uclamp_util_with(struct rq *rq, unsigned int util,