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Commit ca2db6cf authored by Mathieu Desnoyers's avatar Mathieu Desnoyers Committed by Ingo Molnar
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tracepoints: use rcu sched 



Make tracepoints use rcu sched. (cleanup)

Signed-off-by: default avatarMathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent d74185ed

kernel/tracepoint.c

+6 −9
Original line number Diff line number Diff line
@@ -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 */