linux-kernel - Re: [PATCH] stats: Replace seq_printf with seq

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Date:   Wed, 16 Sep 2020 10:12:25 +0200
From:   peterz@...radead.org
To:     Xu Wang <vulab@...as.ac.cn>
Cc:     mingo@...hat.com, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] stats: Replace seq_printf with seq_puts

On Wed, Sep 16, 2020 at 03:44:15AM +0000, Xu Wang wrote:
> seq_puts is a lot cheaper than seq_printf, so use that to print
> literal strings.

performance is not a consideration here.

> Signed-off-by: Xu Wang <vulab@...as.ac.cn>
> ---
>  kernel/sched/stats.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/sched/stats.c b/kernel/sched/stats.c
> index 750fb3c67eed..0818fe03407a 100644
> --- a/kernel/sched/stats.c
> +++ b/kernel/sched/stats.c
> @@ -37,7 +37,7 @@ static int show_schedstat(struct seq_file *seq, void *v)
>  		    rq->rq_cpu_time,
>  		    rq->rq_sched_info.run_delay, rq->rq_sched_info.pcount);
>  
> -		seq_printf(seq, "\n");
> +		seq_putc(seq, '\n');

And yet, the changelog says seq_put*s*().

>  
>  #ifdef CONFIG_SMP
>  		/* domain-specific stats */
> -- 
> 2.17.1
>