tree c3e4e14cdefd9ff7680c14d83ceaffb4e8fd6134
parent 29f870688d53429ea0478a064f6f175b74c71516
author Eric W. Biederman <ebiederm@xmission.com> 1267570313 -0800
committer Eric W. Biederman <ebiederm@aristanetworks.com> 1312884012 -0500

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.

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