rcu/kvfree: Initialize kvfree_rcu() separately

Introduce a separate initialization of kvfree_rcu() functionality.
For such purpose a kfree_rcu_batch_init() is renamed to a kvfree_rcu_init()
and it is invoked from the main.c right after rcu_init() is done.

Signed-off-by: Uladzislau Rezki (Sony) <[email protected]>
Acked-by: Hyeonggon Yoo <[email protected]>
Tested-by: Hyeonggon Yoo <[email protected]>
Signed-off-by: Vlastimil Babka <[email protected]>

Author: urezki

include/linux/rcupdate.h

@@ -118,6 +118,7 @@ static inline void call_rcu_hurry(struct rcu_head *head, rcu_callback_t func)
 
 /* Internal to kernel */
 void rcu_init(void);
+void __init kvfree_rcu_init(void);
 extern int rcu_scheduler_active;
 void rcu_sched_clock_irq(int user);
 

init/main.c

@@ -992,6 +992,7 @@ void start_kernel(void)
 	workqueue_init_early();
 
 	rcu_init();
+	kvfree_rcu_init();
 
 	/* Trace events are available after this */
 	trace_init();

kernel/rcu/tree.c

@@ -5648,7 +5648,7 @@ static void __init rcu_dump_rcu_node_tree(void)
 
 struct workqueue_struct *rcu_gp_wq;
 
-static void __init kfree_rcu_batch_init(void)
+void __init kvfree_rcu_init(void)
 {
 	int cpu;
 	int i, j;
@@ -5703,7 +5703,6 @@ void __init rcu_init(void)
 
 	rcu_early_boot_tests();
 
-	kfree_rcu_batch_init();
 	rcu_bootup_announce();
 	sanitize_kthread_prio();
 	rcu_init_geometry();