Date: Thu, 27 Nov 2008 02:19:10 +0100
From: Bastian Blank <bastian@waldi.eu.org>
To: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Cc: oleg@redhat.com, ebiederm@xmission.com, roland@redhat.com,
       containers@lists.osdl.org, linux-kernel@vger.kernel.org,
       xemul@openvz.org
Subject: Re: [RFC][PATCH 1/5] pid: Implement ns_of_pid
Message-ID: <20081127011910.GD13545@wavehammer.waldi.eu.org>
Mail-Followup-To: Bastian Blank <bastian@waldi.eu.org>,
	Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>, oleg@redhat.com,
	ebiederm@xmission.com, roland@redhat.com, containers@lists.osdl.org,
	linux-kernel@vger.kernel.org, xemul@openvz.org
References: <20081126034242.GA23120@us.ibm.com> <20081126034442.GA23238@us.ibm.com>
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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?

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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