Mark-PK Tsai 6eb85cbd9e tracing: Avoid adding tracer option before update_tracer_options
[ Upstream commit ef9188bcc6ca1d8a2ad83e826b548e6820721061 ]

To prepare for support asynchronous tracer_init_tracefs initcall,
avoid calling create_trace_option_files before __update_tracer_options.
Otherwise, create_trace_option_files will show warning because
some tracers in trace_types list are already in tr->topts.

For example, hwlat_tracer call register_tracer in late_initcall,
and global_trace.dir is already created in tracing_init_dentry,
hwlat_tracer will be put into tr->topts.
Then if the __update_tracer_options is executed after hwlat_tracer
registered, create_trace_option_files find that hwlat_tracer is
already in tr->topts.

Link: https://lkml.kernel.org/r/20220426122407.17042-2-mark-pk.tsai@mediatek.com

Link: https://lore.kernel.org/lkml/20220322133339.GA32582@xsang-OptiPlex-9020/
Reported-by: kernel test robot <oliver.sang@intel.com>
Signed-off-by: Mark-PK Tsai <mark-pk.tsai@mediatek.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2022-06-14 18:36:14 +02:00
..
2022-06-09 10:23:03 +02:00
2021-09-02 13:00:15 -07:00
2021-08-11 13:11:12 -07:00
2021-09-08 15:32:35 -07:00
2022-03-08 19:12:49 +01:00
2021-06-18 11:43:08 +02:00
2021-09-08 15:32:34 -07:00
2021-05-07 00:26:33 -07:00
2021-05-07 00:26:34 -07:00