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Date:   Mon, 07 Jan 2019 07:25:07 -0800 (PST)
Message-Id: <20190107.072507.2123333109511407402.davem@davemloft.net>
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Cc:     netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
        daniel@iogearbox.net, ast@kernel.org, mcgrof@kernel.org
Subject: Re: [PATCH net v3 1/4] umh: add exit routine for UMH process
From:   David Miller <davem@davemloft.net>
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From: Taehee Yoo <ap420073@gmail.com>
Date: Mon,  7 Jan 2019 21:10:14 +0900

> @@ -679,6 +688,29 @@ static int proc_cap_handler(struct ctl_table *table, int write,
>  	return 0;
>  }
>  
> +void exit_umh(struct task_struct *tsk)
> +{
> +	struct umh_info *info;
> +	pid_t pid = tsk->pid;
> +
> +	if (!(tsk->flags & PF_UMH))
> +		return;

Let's really make this low cost.

In linux/sched.h or similar:

void __exit_umh(struct task_struct *tsk);

static inline void exit_umh(struct task_struct *tsk)
{
	if (unlikely(tsk->flags & PF_UMH))
		__exit_umh(tsk);
}

Thank you.