linux-kernel - Re: [PATCH linux-next RESEND] sched/core: Add WARN() to checks in migrate

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Date: Tue, 2 Jul 2024 12:43:34 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: <xu.xin16@....com.cn>
Cc: <mingo@...hat.com>, <peterz@...radead.org>, <juri.lelli@...hat.com>,
 <vincent.guittot@...aro.org>, <ietmar.eggemann@....com>,
 <ostedt@...dmis.org>, <bsegall@...gle.com>, <mgorman@...e.de>,
 <bristot@...hat.com>, <he.peilin@....com.cn>, <yang.yang29@....com.cn>,
 <tu.qiang35@....com.cn>, <jiang.kun2@....com.cn>,
 <zhang.yunkai@....com.cn>, <liu.chun2@....com.cn>, <fan.yu9@....com.cn>,
 <linux-kernel@...r.kernel.org>
Subject: Re:  [PATCH linux-next RESEND] sched/core: Add WARN() to checks in
 migrate_disable()

On Tue, 2 Jul 2024 19:33:59 +0800 (CST)
<xu.xin16@....com.cn> wrote:

> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -2259,6 +2259,8 @@ void migrate_disable(void)
>  	struct task_struct *p = current;
> 
>  	if (p->migration_disabled) {
> +		if (p->migration_disabled == USHRT_MAX)
> +			WARN(1, "migration_disabled has encountered an overflow.\n");

This is redundant, you want:

		WARN(p->migration_disabled == USHRT_MAX, "migration_disabled has encountered an overflow.");

I'm not sure the '\n' is needed, but it seems like 50% of WARN() has
them, and 50% do not.

-- Steve


>  		p->migration_disabled++;
>  		return;
>  	}