rcu: combine duplicate code, courtesy of CONFIG_PREEMPT_RCU

The CONFIG_PREEMPT_RCU kernel configuration parameter was recently
re-introduced, but as an indication of the type of RCU (preemptible
vs. non-preemptible) instead of as selecting a given implementation.
This commit uses CONFIG_PREEMPT_RCU to combine duplicate code
from include/linux/rcutiny.h and include/linux/rcutree.h into
include/linux/rcupdate.h.  This commit also combines a few other pieces
of duplicate code that have accumulated.

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

1 files changed, 0 insertions, 51 deletions

diff --git a/include/linux/rcutiny.h b/include/linux/rcutiny.h
index c6b11dc5ba0a..13877cb93a60 100644
--- a/include/linux/rcutiny.h
+++ b/include/linux/rcutiny.h
@@ -27,34 +27,10 @@
 
 #include <linux/cache.h>
 
-void rcu_sched_qs(int cpu);
-void rcu_bh_qs(int cpu);
-
-#ifdef CONFIG_TINY_RCU
-#define __rcu_read_lock()       preempt_disable()
-#define __rcu_read_unlock()     preempt_enable()
-#else /* #ifdef CONFIG_TINY_RCU */
-void __rcu_read_lock(void);
-void __rcu_read_unlock(void);
-#endif /* #else #ifdef CONFIG_TINY_RCU */
-#define __rcu_read_lock_bh()    local_bh_disable()
-#define __rcu_read_unlock_bh()  local_bh_enable()
-extern void call_rcu_sched(struct rcu_head *head,
-                           void (*func)(struct rcu_head *rcu));
-
 #define rcu_init_sched()        do { } while (0)
 
-extern void synchronize_sched(void);
-
 #ifdef CONFIG_TINY_RCU
 
-#define call_rcu                call_rcu_sched
-
-static inline void synchronize_rcu(void)
-{
-        synchronize_sched();
-}
-
 static inline void synchronize_rcu_expedited(void)
 {
         synchronize_sched();    /* Only one CPU, so pretty fast anyway!!! */
@@ -67,7 +43,6 @@ static inline void rcu_barrier(void)
 
 #else /* #ifdef CONFIG_TINY_RCU */
 
-void synchronize_rcu(void);
 void rcu_barrier(void);
 void synchronize_rcu_expedited(void);
 
@@ -83,25 +58,6 @@ static inline void synchronize_rcu_bh_expedited(void)
         synchronize_sched();
 }
 
-struct notifier_block;
-
-#ifdef CONFIG_NO_HZ
-
-extern void rcu_enter_nohz(void);
-extern void rcu_exit_nohz(void);
-
-#else /* #ifdef CONFIG_NO_HZ */
-
-static inline void rcu_enter_nohz(void)
-{
-}
-
-static inline void rcu_exit_nohz(void)
-{
-}
-
-#endif /* #else #ifdef CONFIG_NO_HZ */
-
 #ifdef CONFIG_TINY_RCU
 
 static inline void rcu_preempt_note_context_switch(void)
@@ -117,11 +73,6 @@ static inline int rcu_needs_cpu(int cpu)
         return 0;
 }
 
-static inline int rcu_preempt_depth(void)
-{
-        return 0;
-}
-
 #else /* #ifdef CONFIG_TINY_RCU */
 
 void rcu_preempt_note_context_switch(void);
@@ -141,8 +92,6 @@ static inline void rcu_note_context_switch(int cpu)
         rcu_preempt_note_context_switch();
 }
 
-extern void rcu_check_callbacks(int cpu, int user);
-
 /*
  * Return the number of grace periods.
  */