sched: constify sched.h

Add const to some struct task_struct * uses
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

include/linux/sched.h

@@ -1196,7 +1196,7 @@ static inline int rt_prio(int prio)
 	return 0;
 }
 
-static inline int rt_task(struct task_struct *p)
+static inline int rt_task(const struct task_struct *p)
 {
 	return rt_prio(p->prio);
 }
@@ -1211,22 +1211,22 @@ static inline void set_task_pgrp(struct task_struct *tsk, pid_t pgrp)
 	tsk->signal->__pgrp = pgrp;
 }
 
-static inline struct pid *task_pid(struct task_struct *task)
+static inline struct pid *task_pid(const struct task_struct *task)
 {
 	return task->pids[PIDTYPE_PID].pid;
 }
 
-static inline struct pid *task_tgid(struct task_struct *task)
+static inline struct pid *task_tgid(const struct task_struct *task)
 {
 	return task->group_leader->pids[PIDTYPE_PID].pid;
 }
 
-static inline struct pid *task_pgrp(struct task_struct *task)
+static inline struct pid *task_pgrp(const struct task_struct *task)
 {
 	return task->group_leader->pids[PIDTYPE_PGID].pid;
 }
 
-static inline struct pid *task_session(struct task_struct *task)
+static inline struct pid *task_session(const struct task_struct *task)
 {
 	return task->group_leader->pids[PIDTYPE_SID].pid;
 }
@@ -1255,7 +1255,7 @@ struct pid_namespace;
  * see also pid_nr() etc in include/linux/pid.h
  */
 
-static inline pid_t task_pid_nr(struct task_struct *tsk)
+static inline pid_t task_pid_nr(const struct task_struct *tsk)
 {
 	return tsk->pid;
 }
@@ -1268,7 +1268,7 @@ static inline pid_t task_pid_vnr(struct task_struct *tsk)
 }
 
 
-static inline pid_t task_tgid_nr(struct task_struct *tsk)
+static inline pid_t task_tgid_nr(const struct task_struct *tsk)
 {
 	return tsk->tgid;
 }
@@ -1281,7 +1281,7 @@ static inline pid_t task_tgid_vnr(struct task_struct *tsk)
 }
 
 
-static inline pid_t task_pgrp_nr(struct task_struct *tsk)
+static inline pid_t task_pgrp_nr(const struct task_struct *tsk)
 {
 	return tsk->signal->__pgrp;
 }
@@ -1294,7 +1294,7 @@ static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
 }
 
 
-static inline pid_t task_session_nr(struct task_struct *tsk)
+static inline pid_t task_session_nr(const struct task_struct *tsk)
 {
 	return tsk->signal->__session;
 }
@@ -1321,7 +1321,7 @@ static inline pid_t task_ppid_nr_ns(struct task_struct *tsk,
  * If pid_alive fails, then pointers within the task structure
  * can be stale and must not be dereferenced.
  */
-static inline int pid_alive(struct task_struct *p)
+static inline int pid_alive(const struct task_struct *p)
 {
 	return p->pids[PIDTYPE_PID].pid != NULL;
 }
@@ -1332,7 +1332,7 @@ static inline int pid_alive(struct task_struct *p)
  *
  * Check if a task structure is the first user space task the kernel created.
  */
-static inline int is_global_init(struct task_struct *tsk)
+static inline int is_global_init(const struct task_struct *tsk)
 {
 	return tsk->pid == 1;
 }
@@ -1469,7 +1469,7 @@ extern int rt_mutex_getprio(struct task_struct *p);
 extern void rt_mutex_setprio(struct task_struct *p, int prio);
 extern void rt_mutex_adjust_pi(struct task_struct *p);
 #else
-static inline int rt_mutex_getprio(struct task_struct *p)
+static inline int rt_mutex_getprio(const struct task_struct *p)
 {
 	return p->normal_prio;
 }
@@ -1721,7 +1721,7 @@ extern void wait_task_inactive(struct task_struct * p);
  * all we care about is that we have a task with the appropriate
  * pid, we don't actually care if we have the right task.
  */
-static inline int has_group_leader_pid(struct task_struct *p)
+static inline int has_group_leader_pid(const struct task_struct *p)
 {
 	return p->pid == p->tgid;
 }
@@ -1738,7 +1738,7 @@ static inline struct task_struct *next_thread(const struct task_struct *p)
 			  struct task_struct, thread_group);
 }
 
-static inline int thread_group_empty(struct task_struct *p)
+static inline int thread_group_empty(const struct task_struct *p)
 {
 	return list_empty(&p->thread_group);
 }