[RFC][PATCH] (version 2) Introduce /proc/$$/loginuid

This patch finishes some of the cleanup of the last patch which moved loginuid into the task_struct, and introduces /proc/$$/loginuid. The only comment I can think of which I haven't yet integrated was getting rid of the get_free_page() in proc_loginuid_read(). I had problems when I tried to do that earlier, but those were probably due to the loginuid in audit_context problem. thanks, -serge -- Serge Hallyn <serue(a)us.ibm.com&gt;