proc: Split the namespace stuff out into linux/proc_ns.h

Split the proc namespace stuff out into linux/proc_ns.h.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: netdev@vger.kernel.org
cc: Serge E. Hallyn <serge.hallyn@ubuntu.com>
cc: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c
index c1c3dc1..4af28a8 100644
--- a/kernel/pid_namespace.c
+++ b/kernel/pid_namespace.c
@@ -15,7 +15,7 @@
 #include <linux/err.h>
 #include <linux/acct.h>
 #include <linux/slab.h>
-#include <linux/proc_fs.h>
+#include <linux/proc_ns.h>
 #include <linux/reboot.h>
 #include <linux/export.h>