linux-kernel - Re: [PATCH] sched: loadavg: delete useless param ticks for calc_global

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Date:   Tue, 28 Jul 2020 11:28:06 +0200
From:   Dietmar Eggemann <dietmar.eggemann@....com>
To:     Wang Wenhu <wenhu.wang@...o.com>, Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        John Stultz <john.stultz@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Stephen Boyd <sboyd@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sched: loadavg: delete useless param ticks for
 calc_global_load

On 28/07/2020 10:58, Wang Wenhu wrote:
> The only parameter "unsigned long ticks" for calc_global_load is
> never used inside the function definition. Delete it now.
> 
> Signed-off-by: Wang Wenhu <wenhu.wang@...o.com>
> ---
>  include/linux/sched/loadavg.h | 2 +-
>  kernel/sched/loadavg.c        | 2 +-
>  kernel/time/timekeeping.c     | 2 +-
>  3 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/include/linux/sched/loadavg.h b/include/linux/sched/loadavg.h
> index 4859bea47a7b..83ec54b65e79 100644
> --- a/include/linux/sched/loadavg.h
> +++ b/include/linux/sched/loadavg.h
> @@ -43,6 +43,6 @@ extern unsigned long calc_load_n(unsigned long load, unsigned long exp,
>  #define LOAD_INT(x) ((x) >> FSHIFT)
>  #define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
>  
> -extern void calc_global_load(unsigned long ticks);
> +extern void calc_global_load(void);
>  
>  #endif /* _LINUX_SCHED_LOADAVG_H */
> diff --git a/kernel/sched/loadavg.c b/kernel/sched/loadavg.c
> index de22da666ac7..d2a655643a02 100644
> --- a/kernel/sched/loadavg.c
> +++ b/kernel/sched/loadavg.c
> @@ -347,7 +347,7 @@ static inline void calc_global_nohz(void) { }
>   *
>   * Called from the global timer code.
>   */
> -void calc_global_load(unsigned long ticks)
> +void calc_global_load(void)
>  {
>  	unsigned long sample_window;
>  	long active, delta;
> diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
> index d20d489841c8..63a632f9896c 100644
> --- a/kernel/time/timekeeping.c
> +++ b/kernel/time/timekeeping.c
> @@ -2193,7 +2193,7 @@ EXPORT_SYMBOL(ktime_get_coarse_ts64);
>  void do_timer(unsigned long ticks)
>  {
>  	jiffies_64 += ticks;
> -	calc_global_load(ticks);
> +	calc_global_load();
>  }
>  
>  /**

There is already commit 46132e3ac58c ("sched: nohz: stop passing around
unused "ticks" parameter.") in linux-next master.