On Mon, May 14, 2018 at 04:58:50PM -0400, Steven Rostedt wrote:
> From: "Steven Rostedt (VMware)" <rostedt@xxxxxxxxxxx>
>
> The filter file in the ftrace internal events, like in
> /sys/kernel/tracing/events/ftrace/function/filter is not attached to any
> functionality. Do not create them as they are meaningless.
>
> In the future, if an ftrace internal event gets filter functionality, then
> it will need to create it directly.
>
> Signed-off-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>
> ---
> kernel/trace/trace_events.c | 10 ++++++----
> 1 file changed, 6 insertions(+), 4 deletions(-)
>
> diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
> index 5b647904a65b..14ff4ff3caab 100644
> --- a/kernel/trace/trace_events.c
> +++ b/kernel/trace/trace_events.c
> @@ -2007,16 +2007,18 @@ event_create_dir(struct dentry *parent, struct trace_event_file *file)
> return -1;
> }
> }
> - trace_create_file("filter", 0644, file->dir, file,
> - &ftrace_event_filter_fops);
>
> /*
> * Only event directories that can be enabled should have
> - * triggers.
> + * triggers or filters.
> */
> - if (!(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE))
> + if (!(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) {
> + trace_create_file("filter", 0644, file->dir, file,
> + &ftrace_event_filter_fops);
> +
> trace_create_file("trigger", 0644, file->dir, file,
> &event_trigger_fops);
> + }
>
> #ifdef CONFIG_HIST_TRIGGERS
> trace_create_file("hist", 0444, file->dir, file,
What about moving the "hist" file as well since it's meaningless
without the trigger.
Thanks,
Namhyung
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