[PATCH] Fix more header file breakage

Since namespace.h needs the contents of dcache, task struct and
semaphores, it seems sensible to include these two files into
namespace.h.

For the future: If the task_struct in sched.h is split into its own
include file, namespace.h could include this file, but namespace.h
will also need asm/semaphore.h

include/linux/namespace.h

@@ -2,6 +2,9 @@
 #define _NAMESPACE_H_
 #ifdef __KERNEL__
 
+#include <linux/dcache.h>
+#include <linux/sched.h>
+
 struct namespace {
 	atomic_t		count;
 	struct vfsmount *	root;

kernel/fork.c

@@ -24,6 +24,7 @@
 #include <linux/file.h>
 #include <linux/binfmts.h>
 #include <linux/fs.h>
+#include <linux/mm.h>
 
 #include <asm/pgtable.h>
 #include <asm/pgalloc.h>

mm/vmalloc.c

@@ -10,6 +10,7 @@
 #include <linux/slab.h>
 #include <linux/vmalloc.h>
 #include <linux/spinlock.h>
+#include <linux/mm.h>
 #include <linux/highmem.h>
 #include <linux/smp_lock.h>