tree c5cec307c06f7e4ddc26e04e73c8833897b67113
parent 49f4d8b93ccf9454284b6f524b96c66d8d7fbccc
author Eric W. Biederman <ebiederm@xmission.com> 1267570313 -0800
committer Eric W. Biederman <ebiederm@xmission.com> 1353333549 -0800

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>