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authorValentin Schneider <valentin.schneider@arm.com>2019-11-15 10:39:08 +0000
committerIngo Molnar <mingo@kernel.org>2019-11-17 10:46:05 +0100
commit7763baace1b738d65efa46d68326c9406311c6bf (patch)
tree4fc5e78ebfb5af865bb77c32e9596ba7726a8d9e
parenta0e813f26ebcb25c0b5e504498fbd796cca1a4ba (diff)
downloadlinux-7763baace1b738d65efa46d68326c9406311c6bf.tar.bz2
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 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>
-rw-r--r--kernel/sched/core.c6
-rw-r--r--kernel/sched/sched.h2
2 files changed, 4 insertions, 4 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 513a4794ff36..3ceff1c93ef1 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 05c282775f21..280a3c735935 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -2300,7 +2300,7 @@ 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,