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Commit 9a1e9693 authored by Mathieu Desnoyers's avatar Mathieu Desnoyers Committed by Ingo Molnar
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tracepoints: fix reentrancy 



The tracepoints had the same problem markers did have wrt reentrancy. Apply a
similar fix using a rcu_barrier after each tracepoint mutex lock.

Signed-off-by: default avatarMathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent ca2db6cf

kernel/tracepoint.c

+4 −0
Original line number Diff line number Diff line
@@ -356,6 +356,8 @@ int tracepoint_probe_register(const char *name, void *probe) 
	mutex_lock(&tracepoints_mutex);

	entry = get_tracepoint(name);

	WARN_ON(!entry);

	if (entry->rcu_pending)

		rcu_barrier_sched();

	tracepoint_entry_free_old(entry, old);

end:

	mutex_unlock(&tracepoints_mutex);
@@ -392,6 +394,8 @@ int tracepoint_probe_unregister(const char *name, void *probe) 
	entry = get_tracepoint(name);

	if (!entry)

		goto end;

	if (entry->rcu_pending)

		rcu_barrier_sched();

	tracepoint_entry_free_old(entry, old);

	remove_tracepoint(name);	/* Ignore busy error message */

	ret = 0;