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/net/sunrpc/auth.c b/net/sunrpc/auth.c
index 8fc3805..c795432 100644
--- a/net/sunrpc/auth.c
+++ b/net/sunrpc/auth.c
@@ -353,7 +353,7 @@
 	struct auth_cred acred = {
 		.uid = current_fsuid(),
 		.gid = current_fsgid(),
-		.group_info = current->group_info,
+		.group_info = current->cred->group_info,
 	};
 	struct rpc_cred *ret;