1 files changed, 6 insertions, 25 deletions

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 789923fbee3a..00de3e950dd4 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -779,7 +779,8 @@ struct task_struct {
 	struct list_head		ptrace_entry;
 
 	/* PID/PID hash table linkage. */
-	struct pid_link			pids[PIDTYPE_MAX];
+	struct pid			*thread_pid;
+	struct hlist_node		pid_links[PIDTYPE_MAX];
 	struct list_head		thread_group;
 	struct list_head		thread_node;
 
@@ -1209,27 +1210,7 @@ struct task_struct {
 
 static inline struct pid *task_pid(struct task_struct *task)
 {
-	return task->pids[PIDTYPE_PID].pid;
-}
-
-static inline struct pid *task_tgid(struct task_struct *task)
-{
-	return task->group_leader->pids[PIDTYPE_PID].pid;
-}
-
-/*
- * Without tasklist or RCU lock it is not safe to dereference
- * the result of task_pgrp/task_session even if task == current,
- * we can race with another thread doing sys_setsid/sys_setpgid.
- */
-static inline struct pid *task_pgrp(struct task_struct *task)
-{
-	return task->group_leader->pids[PIDTYPE_PGID].pid;
-}
-
-static inline struct pid *task_session(struct task_struct *task)
-{
-	return task->group_leader->pids[PIDTYPE_SID].pid;
+	return task->thread_pid;
 }
 
 /*
@@ -1278,7 +1259,7 @@ static inline pid_t task_tgid_nr(struct task_struct *tsk)
  */
 static inline int pid_alive(const struct task_struct *p)
 {
-	return p->pids[PIDTYPE_PID].pid != NULL;
+	return p->thread_pid != NULL;
 }
 
 static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns)
@@ -1304,12 +1285,12 @@ static inline pid_t task_session_vnr(struct task_struct *tsk)
 
 static inline pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns)
 {
-	return __task_pid_nr_ns(tsk, __PIDTYPE_TGID, ns);
+	return __task_pid_nr_ns(tsk, PIDTYPE_TGID, ns);
 }
 
 static inline pid_t task_tgid_vnr(struct task_struct *tsk)
 {
-	return __task_pid_nr_ns(tsk, __PIDTYPE_TGID, NULL);
+	return __task_pid_nr_ns(tsk, PIDTYPE_TGID, NULL);
 }
 
 static inline pid_t task_ppid_nr_ns(const struct task_struct *tsk, struct pid_namespace *ns)