sched/headers, RCU: Move rcu_copy_process() from <linux/sched/task.h> to kernel/fork.c

Move rcu_copy_process() into kernel/fork.c, which is the only
user of this inline function.

This simplifies <linux/sched/task.h> to the level that <linux/sched.h>
does not have to be included in it anymore - which change is done
in a subsequent patch.

Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

include/linux/sched/task.h

@@ -25,21 +25,6 @@ extern asmlinkage void schedule_tail(struct task_struct *prev);
 extern void init_idle(struct task_struct *idle, int cpu);
 extern void init_idle_bootup_task(struct task_struct *idle);
 
-static inline void rcu_copy_process(struct task_struct *p)
-{
-#ifdef CONFIG_PREEMPT_RCU
-	p->rcu_read_lock_nesting = 0;
-	p->rcu_read_unlock_special.s = 0;
-	p->rcu_blocked_node = NULL;
-	INIT_LIST_HEAD(&p->rcu_node_entry);
-#endif /* #ifdef CONFIG_PREEMPT_RCU */
-#ifdef CONFIG_TASKS_RCU
-	p->rcu_tasks_holdout = false;
-	INIT_LIST_HEAD(&p->rcu_tasks_holdout_list);
-	p->rcu_tasks_idle_cpu = -1;
-#endif /* #ifdef CONFIG_TASKS_RCU */
-}
-
 extern int sched_fork(unsigned long clone_flags, struct task_struct *p);
 extern void sched_dead(struct task_struct *p);
 

kernel/fork.c

@@ -1465,6 +1465,21 @@ init_task_pid(struct task_struct *task, enum pid_type type, struct pid *pid)
 	 task->pids[type].pid = pid;
 }
 
+static inline void rcu_copy_process(struct task_struct *p)
+{
+#ifdef CONFIG_PREEMPT_RCU
+	p->rcu_read_lock_nesting = 0;
+	p->rcu_read_unlock_special.s = 0;
+	p->rcu_blocked_node = NULL;
+	INIT_LIST_HEAD(&p->rcu_node_entry);
+#endif /* #ifdef CONFIG_PREEMPT_RCU */
+#ifdef CONFIG_TASKS_RCU
+	p->rcu_tasks_holdout = false;
+	INIT_LIST_HEAD(&p->rcu_tasks_holdout_list);
+	p->rcu_tasks_idle_cpu = -1;
+#endif /* #ifdef CONFIG_TASKS_RCU */
+}
+
 /*
  * This creates a new process as a copy of the old one,
  * but does not actually start it yet.