diff --git a/include/linux/sched.h b/include/linux/sched.h
index 6867ae9..5fdc1eb 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -90,6 +90,7 @@
 #include <linux/latencytop.h>
 #include <linux/cred.h>
 #include <linux/llist.h>
+#include <linux/uidgid.h>
 
 #include <asm/processor.h>
 
@@ -728,8 +729,7 @@
 
 	/* Hash table maintenance information */
 	struct hlist_node uidhash_node;
-	uid_t uid;
-	struct user_namespace *_user_ns; /* Don't use will be removed soon */
+	kuid_t uid;
 
 #ifdef CONFIG_PERF_EVENTS
 	atomic_long_t locked_vm;
@@ -738,7 +738,7 @@
 
 extern int uids_sysfs_init(void);
 
-extern struct user_struct *find_user(uid_t);
+extern struct user_struct *find_user(kuid_t);
 
 extern struct user_struct root_user;
 #define INIT_USER (&root_user)
@@ -2177,7 +2177,7 @@
 extern void __set_special_pids(struct pid *pid);
 
 /* per-UID process charging. */
-extern struct user_struct * alloc_uid(struct user_namespace *, uid_t);
+extern struct user_struct * alloc_uid(kuid_t);
 static inline struct user_struct *get_uid(struct user_struct *u)
 {
 	atomic_inc(&u->__count);
diff --git a/include/linux/user_namespace.h b/include/linux/user_namespace.h
index dc2d85a..d767508 100644
--- a/include/linux/user_namespace.h
+++ b/include/linux/user_namespace.h
@@ -6,12 +6,8 @@
 #include <linux/sched.h>
 #include <linux/err.h>
 
-#define UIDHASH_BITS	(CONFIG_BASE_SMALL ? 3 : 7)
-#define UIDHASH_SZ	(1 << UIDHASH_BITS)
-
 struct user_namespace {
 	struct kref		kref;
-	struct hlist_head	uidhash_table[UIDHASH_SZ];
 	struct user_namespace	*parent;
 	struct user_struct	*creator;
 	struct work_struct	destroyer;