From: Valentin Schneider valentin.schneider@arm.com
[ Upstream commit 7763baace1b738d65efa46d68326c9406311c6bf ]
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 do return a value in the [0, SCHED_CAPACITY_SCALE] range, which should really be unsigned int. The affected helpers are uclamp_none(), 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() properly returns an 11 bit value (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@arm.com Reviewed-by: Qais Yousef qais.yousef@arm.com Acked-by: Vincent Guittot vincent.guittot@linaro.org Cc: Dietmar.Eggemann@arm.com Cc: Linus Torvalds torvalds@linux-foundation.org Cc: Peter Zijlstra peterz@infradead.org Cc: Thomas Gleixner tglx@linutronix.de Cc: patrick.bellasi@matbug.net Cc: qperret@google.com Cc: surenb@google.com Cc: tj@kernel.org Fixes: 0413d7f33e60 ("sched/uclamp: Always use 'enum uclamp_id' for clamp_id values") Link: https://lkml.kernel.org/r/20191115103908.27610-1-valentin.schneider@arm.com Signed-off-by: Ingo Molnar mingo@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- kernel/sched/core.c | 6 +++--- kernel/sched/sched.h | 2 +- 2 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 44123b4d14e8..8dacda4b0362 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -810,7 +810,7 @@ static inline unsigned int uclamp_bucket_base_value(unsigned int clamp_value) return UCLAMP_BUCKET_DELTA * uclamp_bucket_id(clamp_value); }
-static inline enum uclamp_id uclamp_none(enum uclamp_id clamp_id) +static inline unsigned int uclamp_none(enum uclamp_id clamp_id) { if (clamp_id == UCLAMP_MIN) return 0; @@ -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 c8870c5bd7df..49ed949f850c 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,