rcu: Replace the rcu_barrier enum with pointer to call_rcu*() function

[safe/jmp/linux-2.6] / kernel / rcupdate.c

diff --git a/kernel/rcupdate.c b/kernel/rcupdate.c
index 4a189ea..e432422 100644 (file)
--- a/kernel/rcupdate.c
+++ b/kernel/rcupdate.c
@@ -53,12 +53,6 @@ struct lockdep_map rcu_lock_map =
 EXPORT_SYMBOL_GPL(rcu_lock_map);
 #endif
 
-enum rcu_barrier {
-       RCU_BARRIER_STD,
-       RCU_BARRIER_BH,
-       RCU_BARRIER_SCHED,
-};
-
 static DEFINE_PER_CPU(struct rcu_head, rcu_barrier_head) = {NULL};
 static atomic_t rcu_barrier_cpu_count;
 static DEFINE_MUTEX(rcu_barrier_mutex);
@@ -184,19 +178,12 @@ static void rcu_barrier_func(void *type)
 {
        int cpu = smp_processor_id();
        struct rcu_head *head = &per_cpu(rcu_barrier_head, cpu);
+       void (*call_rcu_func)(struct rcu_head *head,
+                             void (*func)(struct rcu_head *head));
 
        atomic_inc(&rcu_barrier_cpu_count);
-       switch ((enum rcu_barrier)type) {
-       case RCU_BARRIER_STD:
-               call_rcu(head, rcu_barrier_callback);
-               break;
-       case RCU_BARRIER_BH:
-               call_rcu_bh(head, rcu_barrier_callback);
-               break;
-       case RCU_BARRIER_SCHED:
-               call_rcu_sched(head, rcu_barrier_callback);
-               break;
-       }
+       call_rcu_func = type;
+       call_rcu_func(head, rcu_barrier_callback);
 }
 
 static inline void wait_migrated_callbacks(void)
@@ -209,7 +196,8 @@ static inline void wait_migrated_callbacks(void)
  * Orchestrate the specified type of RCU barrier, waiting for all
  * RCU callbacks of the specified type to complete.
  */
-static void _rcu_barrier(enum rcu_barrier type)
+static void _rcu_barrier(void (*call_rcu_func)(struct rcu_head *head,
+                                              void (*func)(struct rcu_head *head)))
 {
        BUG_ON(in_interrupt());
        /* Take cpucontrol mutex to protect against CPU hotplug */
@@ -225,7 +213,7 @@ static void _rcu_barrier(enum rcu_barrier type)
         * early.
         */
        atomic_set(&rcu_barrier_cpu_count, 1);
-       on_each_cpu(rcu_barrier_func, (void *)type, 1);
+       on_each_cpu(rcu_barrier_func, (void *)call_rcu_func, 1);
        if (atomic_dec_and_test(&rcu_barrier_cpu_count))
                complete(&rcu_barrier_completion);
        wait_for_completion(&rcu_barrier_completion);
@@ -238,7 +226,7 @@ static void _rcu_barrier(enum rcu_barrier type)
  */
 void rcu_barrier(void)
 {
-       _rcu_barrier(RCU_BARRIER_STD);
+       _rcu_barrier(call_rcu);
 }
 EXPORT_SYMBOL_GPL(rcu_barrier);
 
@@ -247,7 +235,7 @@ EXPORT_SYMBOL_GPL(rcu_barrier);
  */
 void rcu_barrier_bh(void)
 {
-       _rcu_barrier(RCU_BARRIER_BH);
+       _rcu_barrier(call_rcu_bh);
 }
 EXPORT_SYMBOL_GPL(rcu_barrier_bh);
 
@@ -256,7 +244,7 @@ EXPORT_SYMBOL_GPL(rcu_barrier_bh);
  */
 void rcu_barrier_sched(void)
 {
-       _rcu_barrier(RCU_BARRIER_SCHED);
+       _rcu_barrier(call_rcu_sched);
 }
 EXPORT_SYMBOL_GPL(rcu_barrier_sched);