linux-kernel - Re: [PATCH v2 1/4] sched/uclamp: Make uclamp_util

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Message-ID: <5b293a96-438e-e4f8-3fb0-3820c6d9651c@arm.com>
Date:   Tue, 10 Dec 2019 19:09:45 +0100
From:   Dietmar Eggemann <dietmar.eggemann@....com>
To:     Valentin Schneider <valentin.schneider@....com>,
        linux-kernel@...r.kernel.org
Cc:     peterz@...radead.org, mingo@...nel.org, vincent.guittot@...aro.org,
        patrick.bellasi@...bug.net, qperret@...gle.com,
        qais.yousef@....com, morten.rasmussen@....com
Subject: Re: [PATCH v2 1/4] sched/uclamp: Make uclamp_util_*() helpers use and
 return UL values

On 03/12/2019 16:59, Valentin Schneider wrote:

[...]

> diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
> index 280a3c735935..f1d035e5df7e 100644
> --- a/kernel/sched/sched.h
> +++ b/kernel/sched/sched.h
> @@ -2303,15 +2303,15 @@ static inline void cpufreq_update_util(struct rq *rq, unsigned int flags) {}
>  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,
> -			      struct task_struct *p)
> +unsigned long uclamp_util_with(struct rq *rq, unsigned long util,
> +			       struct task_struct *p)
>  {
> -	unsigned int min_util = READ_ONCE(rq->uclamp[UCLAMP_MIN].value);
> -	unsigned int max_util = READ_ONCE(rq->uclamp[UCLAMP_MAX].value);
> +	unsigned long min_util = READ_ONCE(rq->uclamp[UCLAMP_MIN].value);
> +	unsigned long max_util = READ_ONCE(rq->uclamp[UCLAMP_MAX].value);
>  
>  	if (p) {
> -		min_util = max(min_util, uclamp_eff_value(p, UCLAMP_MIN));
> -		max_util = max(max_util, uclamp_eff_value(p, UCLAMP_MAX));
> +		min_util = max_t(unsigned long, min_util, uclamp_eff_value(p, UCLAMP_MIN));
> +		max_util = max_t(unsigned long, max_util, uclamp_eff_value(p, UCLAMP_MAX));
>  	}
>  
>  	/*
> @@ -2325,17 +2325,17 @@ unsigned int uclamp_util_with(struct rq *rq, unsigned int util,
>  	return clamp(util, min_util, max_util);
>  }
>  
> -static inline unsigned int uclamp_util(struct rq *rq, unsigned int util)
> +static inline unsigned long uclamp_util(struct rq *rq, unsigned long util)
>  {
>  	return uclamp_util_with(rq, util, NULL);
>  }
>  #else /* CONFIG_UCLAMP_TASK */
> -static inline unsigned int uclamp_util_with(struct rq *rq, unsigned int util,
> -					    struct task_struct *p)
> +static inline unsigned long uclamp_util_with(struct rq *rq, unsigned long util,
> +					     struct task_struct *p)
>  {
>  	return util;
>  }
> -static inline unsigned int uclamp_util(struct rq *rq, unsigned int util)
> +static inline unsigned long uclamp_util(struct rq *rq, unsigned long util)
>  {
>  	return util;
>  }

There doesn't seem to be any user of uclamp_util(), only uclamp_util_with()?