linux-kernel - Re: [PATCH] sched: change printk(KERN_<LEVEL>.. to pr

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Date:   Thu, 26 May 2022 02:42:35 -0700
From:   Joe Perches <joe@...ches.com>
To:     Yu Zhe <yuzhe@...china.com>, mingo@...hat.com,
        peterz@...radead.org, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
        bristot@...hat.com, vschneid@...hat.com
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        liqiong@...china.com
Subject: Re: [PATCH] sched: change printk(KERN_<LEVEL>.. to pr_<level>()

On Thu, 2022-05-26 at 02:10 -0700, Yu Zhe wrote:
> Prefer pr_<level>(...  to printk(KERN_<LEVEL> ..., change them.

Do remember that checkpatch is just a guide and isn't always correct.

You are responsible for verifying that anything it suggests is
converted properly.

> diff --git a/kernel/sched/core.c b/kernel/sched/core.c
[]
> @@ -9370,7 +9370,7 @@ static void dump_rq_tasks(struct rq *rq, const char *loglvl)
>  
>  	lockdep_assert_rq_held(rq);
>  
> -	printk("%sCPU%d enqueued tasks (%u total):\n", loglvl, cpu, rq->nr_running);
> +	pr_warn("%sCPU%d enqueued tasks (%u total):\n", loglvl, cpu, rq->nr_running);

This is _not_ a good change.

Do please look to see what loglvl is and if this change is appropriate.

>  	for_each_process_thread(g, p) {
>  		if (task_cpu(p) != cpu)
>  			continue;
> @@ -9378,7 +9378,7 @@ static void dump_rq_tasks(struct rq *rq, const char *loglvl)
>  		if (!task_on_rq_queued(p))
>  			continue;
>  
> -		printk("%s\tpid: %d, name: %s\n", loglvl, p->pid, p->comm);
> +		pr_warn("%s\tpid: %d, name: %s\n", loglvl, p->pid, p->comm);

here too.