linux-kernel - Re: + proc-export-a-processes-resource-limits-via-proc-pid.patch added to -mm tree

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Message-ID: <20070818190351.GA98@tv-sign.ru>
Date:	Sat, 18 Aug 2007 23:03:51 +0400
From:	Oleg Nesterov <oleg@...sign.ru>
To:	Neil Horman <nhorman@...driver.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: + proc-export-a-processes-resource-limits-via-proc-pid.patch added to -mm tree

On 08/18, Neil Horman wrote:
>
> +static int proc_pid_limits(struct task_struct *task, char *buffer)
> +{
> +	unsigned int i;
> +	int count = 0;
> +	unsigned long flags;
> +	char *bufptr = buffer;
> +
> +	struct rlimit rlim[RLIM_NLIMITS];
> +
> +	read_lock(&tasklist_lock);
> +	lock_task_sighand(task, &flags);
> +	if (task->signal == NULL){
> +		unlock_task_sighand(task, &flags);
> +		read_unlock(&tasklist_lock);

Neil, please, don't add tasklist_lock again. It was not easy to wipe it from
fs/proc/ :) Just change this code to use rcu_read_lock().

Oleg.

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