Messages in this thread Patch in this message | | | From | Mathieu Desnoyers <> | Subject | [PATCH 2/2] Tracepoint API doc update: tracepoint_probe_register() return value | Date | Mon, 10 Mar 2014 21:04:58 -0400 |
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Describe the return values of tracepoint_probe_register(), including -ENODEV added by commit:
Author: Steven Rostedt <rostedt@goodmis.org>
tracing: Warn if a tracepoint is not set via debugfs
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> CC: Steven Rostedt <rostedt@goodmis.org> CC: Ingo Molnar <mingo@kernel.org> CC: Frederic Weisbecker <fweisbec@gmail.com> CC: Andrew Morton <akpm@linux-foundation.org> --- kernel/tracepoint.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/kernel/tracepoint.c b/kernel/tracepoint.c index 49cb94e..0839258 100644 --- a/kernel/tracepoint.c +++ b/kernel/tracepoint.c @@ -378,7 +378,17 @@ tracepoint_add_probe(const char *name, void *probe, void *data) * @probe: probe handler * @data: probe private data * - * Returns 0 if ok, error value on error. + * Returns: + * - 0 if the probe was successfully registered, and tracepoint + * callsites are currently loaded for that probe, + * - -ENODEV if the probe was successfully registered, but no tracepoint + * callsite is currently loaded for that probe, + * - other negative error value on error. + * + * When tracepoint_probe_register() returns either 0 or -ENODEV, + * parameters @name, @probe, and @data may be used by the tracepoint + * infrastructure until the probe is unregistered. + * * The probe address must at least be aligned on the architecture pointer size. */ int tracepoint_probe_register(const char *name, void *probe, void *data) -- 1.7.10.4
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