From: Pavel Emelyanov <xemul@openvz.org>

Since we've switched from using pid->nr to pid->upids->nr some
fields on struct pid are no longer needed

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Sukadev Bhattiprolu <sukadev@us.ibm.com>
Cc: Paul Menage <menage@google.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/init_task.h |    3 ---
 include/linux/pid.h       |    3 ---
 kernel/pid.c              |    1 -
 3 files changed, 7 deletions(-)

diff -puN include/linux/init_task.h~pid-namespaces-remove-the-struct-pid-unneeded-fields include/linux/init_task.h
--- a/include/linux/init_task.h~pid-namespaces-remove-the-struct-pid-unneeded-fields
+++ a/include/linux/init_task.h
@@ -94,9 +94,6 @@ extern struct group_info init_groups;
 
 #define INIT_STRUCT_PID {						\
 	.count 		= ATOMIC_INIT(1),				\
-	.nr		= 0, 						\
-	/* Don't put this struct pid in pid_hash */			\
-	.pid_chain	= { .next = NULL, .pprev = NULL },		\
 	.tasks		= {						\
 		{ .first = &init_task.pids[PIDTYPE_PID].node },		\
 		{ .first = &init_task.pids[PIDTYPE_PGID].node },	\
diff -puN include/linux/pid.h~pid-namespaces-remove-the-struct-pid-unneeded-fields include/linux/pid.h
--- a/include/linux/pid.h~pid-namespaces-remove-the-struct-pid-unneeded-fields
+++ a/include/linux/pid.h
@@ -57,9 +57,6 @@ struct upid {
 struct pid
 {
 	atomic_t count;
-	/* Try to keep pid_chain in the same cacheline as nr for find_pid */
-	int nr;
-	struct hlist_node pid_chain;
 	/* lists of tasks that use this pid */
 	struct hlist_head tasks[PIDTYPE_MAX];
 	struct rcu_head rcu;
diff -puN kernel/pid.c~pid-namespaces-remove-the-struct-pid-unneeded-fields kernel/pid.c
--- a/kernel/pid.c~pid-namespaces-remove-the-struct-pid-unneeded-fields
+++ a/kernel/pid.c
@@ -263,7 +263,6 @@ struct pid *alloc_pid(struct pid_namespa
 
 	get_pid_ns(ns);
 	pid->level = ns->level;
-	pid->nr = pid->numbers[0].nr;
 	atomic_set(&pid->count, 1);
 	for (type = 0; type < PIDTYPE_MAX; ++type)
 		INIT_HLIST_HEAD(&pid->tasks[type]);
_