rcu: Remove #ifdef moving rcu_end_inkernel_boot from rcupdate.h

This commit removes a #ifdef and saves a few lines of code by moving
the rcu_end_inkernel_boot() function from include/linux/rcupdate.h to
include/linux/rcutiny.h (for TINY_RCU) and to include/linux/rcutree.h
(for TREE_RCU).

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

include/linux/rcupdate.h

@@ -111,12 +111,6 @@ void rcu_check_callbacks(int user);
 void rcu_report_dead(unsigned int cpu);
 void rcu_cpu_starting(unsigned int cpu);
 
-#ifndef CONFIG_TINY_RCU
-void rcu_end_inkernel_boot(void);
-#else /* #ifndef CONFIG_TINY_RCU */
-static inline void rcu_end_inkernel_boot(void) { }
-#endif /* #ifndef CONFIG_TINY_RCU */
-
 #ifdef CONFIG_RCU_STALL_COMMON
 void rcu_sysrq_start(void);
 void rcu_sysrq_end(void);

include/linux/rcutiny.h

@@ -123,7 +123,7 @@ void rcu_scheduler_starting(void);
 #else /* #if defined(CONFIG_DEBUG_LOCK_ALLOC) || defined(CONFIG_SRCU) */
 static inline void rcu_scheduler_starting(void) { }
 #endif /* #else #if defined(CONFIG_DEBUG_LOCK_ALLOC) || defined(CONFIG_SRCU) */
-
+static inline void rcu_end_inkernel_boot(void) { }
 static inline bool rcu_is_watching(void) { return true; }
 
 /* Avoid RCU read-side critical sections leaking across. */

include/linux/rcutree.h

@@ -91,6 +91,7 @@ void exit_rcu(void);
 
 void rcu_scheduler_starting(void);
 extern int rcu_scheduler_active __read_mostly;
+void rcu_end_inkernel_boot(void);
 bool rcu_is_watching(void);
 void rcu_all_qs(void);