From: Eric W. Biederman <ebiederm@xmission.com>
Date: Tue, 2 Mar 2010 22:51:53 +0000 (-0800)
Subject: pidns: Use task_active_pid_ns where appropriate
X-Git-Tag: v3.8-rc1~77^2~29
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=17cf22c33e1f1b5e435469c84e43872579497653;p=pandora-kernel.git

pidns: Use task_active_pid_ns where appropriate

The expressions tsk->nsproxy->pid_ns and task_active_pid_ns
aka ns_of_pid(task_pid(tsk)) should have the same number of
cache line misses with the practical difference that
ns_of_pid(task_pid(tsk)) is released later in a processes life.

Furthermore by using task_active_pid_ns it becomes trivial
to write an unshare implementation for the the pid namespace.

So I have used task_active_pid_ns everywhere I can.

In fork since the pid has not yet been attached to the
process I use ns_of_pid, to achieve the same effect.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
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