linux-kernel - Re: [RFC][PATCH 1/5] pid: Implement ns_of

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Message-ID: <20081201202422.GD12493@us.ibm.com>
Date:	Mon, 1 Dec 2008 12:24:22 -0800
From:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
To:	Bastian Blank <bastian@...di.eu.org>, oleg@...hat.com,
	ebiederm@...ssion.com, roland@...hat.com,
	containers@...ts.osdl.org, linux-kernel@...r.kernel.org,
	xemul@...nvz.org
Subject: Re: [RFC][PATCH 1/5] pid: Implement ns_of_pid

Bastian Blank [bastian@...di.eu.org] wrote:
| On Tue, Nov 25, 2008 at 07:44:42PM -0800, Sukadev Bhattiprolu wrote:
| > +/* ns_of_pid returns the pid namespace in which the specified
| > + * pid was allocated.
| > + */
| > +static inline struct pid_namespace *ns_of_pid(struct pid *pid)
| > +{
| > +	struct pid_namespace *ns = NULL;
| > +	if (pid)
| > +		ns = pid->numbers[pid->level].ns;
| > +	return ns;
| > +}
| > +
| 
| When can the pid argument be null?

Soon after creation but more importantly, after detach_pid()
(release_task).

| 
| Bastian
| 
| -- 
| Another Armenia, Belgium ... the weak innocents who always seem to be
| located on a natural invasion route.
| 		-- Kirk, "Errand of Mercy", stardate 3198.4
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