linux-kernel - Re: [PATCH 13/14] sched: cpufreq: Use IS

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Date:   Fri, 8 May 2020 11:00:53 +0530
From:   Pavan Kondeti <pkondeti@...eaurora.org>
To:     Quentin Perret <qperret@...gle.com>
Cc:     linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, x86@...nel.org,
        hpa@...or.com, sudeep.holla@....com, gregkh@...uxfoundation.org,
        rafael@...nel.org, viresh.kumar@...aro.org, peterz@...radead.org,
        juri.lelli@...hat.com, vincent.guittot@...aro.org,
        dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
        mgorman@...e.de, mcgrof@...nel.org, keescook@...omium.org,
        yzaikin@...gle.com, fweisbec@...il.com, tkjos@...gle.com,
        kernel-team@...roid.com
Subject: Re: [PATCH 13/14] sched: cpufreq: Use IS_ENABLED() for schedutil

Hi Quentin

On Thu, May 07, 2020 at 07:10:11PM +0100, Quentin Perret wrote:
> The IS_ENABLED() macro evaluates to true when an option is set to =y or
> =m. As such, it is a good fit for tristate options.
> 
> In preparation for modularizing schedutil, change all the related ifdefs
> to use IS_ENABLED().
> 
> Signed-off-by: Quentin Perret <qperret@...gle.com>
> ---
>  include/linux/cpufreq.h      | 2 +-
>  include/linux/sched/sysctl.h | 2 +-
>  kernel/sched/sched.h         | 4 ++--
>  kernel/sched/topology.c      | 4 ++--
>  kernel/sysctl.c              | 2 +-
>  5 files changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
> index 267cc3b624da..c1176b8a0f61 100644
> --- a/include/linux/cpufreq.h
> +++ b/include/linux/cpufreq.h
> @@ -983,7 +983,7 @@ static inline bool policy_has_boost_freq(struct cpufreq_policy *policy)
>  }
>  #endif
>  
> -#if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
> +#if defined(CONFIG_ENERGY_MODEL) && IS_ENABLED(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
>  void sched_cpufreq_governor_change(struct cpufreq_policy *policy,
>  			struct cpufreq_governor *old_gov);
>  #else
> diff --git a/include/linux/sched/sysctl.h b/include/linux/sched/sysctl.h
> index d4f6215ee03f..704d971f204f 100644
> --- a/include/linux/sched/sysctl.h
> +++ b/include/linux/sched/sysctl.h
> @@ -94,7 +94,7 @@ extern int sysctl_schedstats(struct ctl_table *table, int write,
>  				 void __user *buffer, size_t *lenp,
>  				 loff_t *ppos);
>  
> -#if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
> +#if defined(CONFIG_ENERGY_MODEL) && IS_ENABLED(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
>  extern unsigned int sysctl_sched_energy_aware;
>  extern int sched_energy_aware_handler(struct ctl_table *table, int write,
>  				 void __user *buffer, size_t *lenp,
> diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
> index 60592cde80e8..087508723e58 100644
> --- a/kernel/sched/sched.h
> +++ b/kernel/sched/sched.h
> @@ -217,7 +217,7 @@ static inline void update_avg(u64 *avg, u64 sample)
>  
>  static inline bool dl_entity_is_special(struct sched_dl_entity *dl_se)
>  {
> -#ifdef CONFIG_CPU_FREQ_GOV_SCHEDUTIL
> +#if IS_ENABLED(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
>  	return unlikely(dl_se->flags & SCHED_FLAG_SUGOV);
>  #else
>  	return false;
> @@ -2459,7 +2459,7 @@ unsigned long scale_irq_capacity(unsigned long util, unsigned long irq, unsigned
>  }
>  #endif
>  
> -#if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
> +#if defined(CONFIG_ENERGY_MODEL) && IS_ENABLED(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
>  
>  #define perf_domain_span(pd) (to_cpumask(((pd)->em_pd->cpus)))
>  
> diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c
> index b905f2e8d9b2..5f49d25730bd 100644
> --- a/kernel/sched/topology.c
> +++ b/kernel/sched/topology.c
> @@ -201,7 +201,7 @@ sd_parent_degenerate(struct sched_domain *sd, struct sched_domain *parent)
>  	return 1;
>  }
>  
> -#if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
> +#if defined(CONFIG_ENERGY_MODEL) && IS_ENABLED(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
>  DEFINE_STATIC_KEY_FALSE(sched_energy_present);
>  unsigned int sysctl_sched_energy_aware = 1;
>  DEFINE_MUTEX(sched_energy_mutex);
> @@ -2287,7 +2287,7 @@ void partition_sched_domains_locked(int ndoms_new, cpumask_var_t doms_new[],
>  		;
>  	}
>  
> -#if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
> +#if defined(CONFIG_ENERGY_MODEL) && IS_ENABLED(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
>  	/* Build perf. domains: */
>  	for (i = 0; i < ndoms_new; i++) {
>  		for (j = 0; j < n && !sched_energy_update; j++) {

Now that scheduler does not have any references to schedutil_gov and cpufreq
has want_eas flag, do we need this CONFIG_CPU_FREQ_GOV_SCHEDUTIL checks here?

Thanks,
Pavan
-- 
Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.