CRED: Separate task security context from task_struct

Separate the task security context from task_struct.  At this point, the
security data is temporarily embedded in the task_struct with two pointers
pointing to it.

Note that the Alpha arch is altered as it refers to (E)UID and (E)GID in
entry.S via asm-offsets.

With comment fixes Signed-off-by: Marc Dionne <marc.c.dionne@gmail.com>

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: James Morris <jmorris@namei.org>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: James Morris <jmorris@namei.org>
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 9f3b478..5c97c5b 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -246,7 +246,7 @@
 
 	memcpy(data->comm, tsk->comm, TASK_COMM_LEN);
 	data->pid = tsk->pid;
-	data->uid = tsk->uid;
+	data->uid = task_uid(tsk);
 	data->nice = tsk->static_prio - 20 - MAX_RT_PRIO;
 	data->policy = tsk->policy;
 	data->rt_priority = tsk->rt_priority;