tracepoints: use rcu sched
Mathieu Desnoyers [Tue, 30 Sep 2008 05:49:39 +0000 (01:49 -0400)]
Make tracepoints use rcu sched. (cleanup)

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

kernel/tracepoint.c

index c7c62a4..db39961 100644 (file)
@@ -80,10 +80,7 @@ static void tracepoint_entry_free_old(struct tracepoint_entry *entry, void *old)
        entry->rcu_pending = 1;
        /* write rcu_pending before calling the RCU callback */
        smp_wmb();
-#ifdef CONFIG_PREEMPT_RCU
-       synchronize_sched();    /* Until we have the call_rcu_sched() */
-#endif
-       call_rcu(&entry->rcu, free_old_closure);
+       call_rcu_sched(&entry->rcu, free_old_closure);
 }
 
 static void debug_print_probes(struct tracepoint_entry *entry)
@@ -245,9 +242,9 @@ static int remove_tracepoint(const char *name)
        if (e->refcount)
                return -EBUSY;
        hlist_del(&e->hlist);
-       /* Make sure the call_rcu has been executed */
+       /* Make sure the call_rcu_sched has been executed */
        if (e->rcu_pending)
-               rcu_barrier();
+               rcu_barrier_sched();
        kfree(e);
        return 0;
 }
@@ -344,11 +341,11 @@ int tracepoint_probe_register(const char *name, void *probe)
                }
        }
        /*
-        * If we detect that a call_rcu is pending for this tracepoint,
+        * If we detect that a call_rcu_sched is pending for this tracepoint,
         * make sure it's executed now.
         */
        if (entry->rcu_pending)
-               rcu_barrier();
+               rcu_barrier_sched();
        old = tracepoint_entry_add_probe(entry, probe);
        if (IS_ERR(old)) {
                ret = PTR_ERR(old);
@@ -387,7 +384,7 @@ int tracepoint_probe_unregister(const char *name, void *probe)
        if (!entry)
                goto end;
        if (entry->rcu_pending)
-               rcu_barrier();
+               rcu_barrier_sched();
        old = tracepoint_entry_remove_probe(entry, probe);
        mutex_unlock(&tracepoints_mutex);
        tracepoint_update_probes();             /* may update entry */