From: Mathieu Desnoyers <[email protected]> Describe the return values of tracepoint_probe_register(), including -ENODEV added by commit:
Author: Steven Rostedt <[email protected]> tracing: Warn if a tracepoint is not set via debugfs Link: http://lkml.kernel.org/r/[email protected] CC: Ingo Molnar <[email protected]> CC: Frederic Weisbecker <[email protected]> CC: Andrew Morton <[email protected]> Signed-off-by: Mathieu Desnoyers <[email protected]> Signed-off-by: Steven Rostedt <[email protected]> --- kernel/tracepoint.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/kernel/tracepoint.c b/kernel/tracepoint.c index a4f629d..e2a58a2 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) -- 1.8.5.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
