linux-kernel - Re: [PATCH] sched: core: Simplify init_sched_mm

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Message-ID: <20230506220435.0d7238c8@rorschach.local.home>
Date:   Sat, 6 May 2023 22:04:35 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Li kunyu <kunyu@...china.com>
Cc:     mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        bsegall@...gle.com, mgorman@...e.de, bristot@...hat.com,
        vschneid@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sched: core: Simplify init_sched_mm_cid()

On Sun,  7 May 2023 10:33:52 +0800
Li kunyu <kunyu@...china.com> wrote:

> int mm_users variable definition move to variable usage location.

Why?

> 
> Signed-off-by: Li kunyu <kunyu@...china.com>
> ---
>  kernel/sched/core.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> index f341e2100304..a66960da3f5c 100644
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -11910,10 +11910,9 @@ static void task_mm_cid_work(struct callback_head *work)
>  void init_sched_mm_cid(struct task_struct *t)
>  {
>  	struct mm_struct *mm = t->mm;
> -	int mm_users = 0;
>  
>  	if (mm) {
> -		mm_users = atomic_read(&mm->mm_users);
> +		int mm_users = atomic_read(&mm->mm_users);

This is not a requirement, and not everyone prefers this method.

If anything, a real cleanup would simply be to remove the "= 0" and
just have it be:

	int mm_users;

As there's no reason to initialize it to zero.

-- Steve

>  		if (mm_users == 1)
>  			mm->mm_cid_next_scan = jiffies + msecs_to_jiffies(MM_CID_SCAN_DELAY);
>  	}