linux-kernel - Re: [PATCH] tracing: Update create_system

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Date:   Thu, 25 Mar 2021 22:31:27 +0800
From:   Qiujun Huang <hqjagain@...il.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     mingo@...hat.com, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] tracing: Update create_system_filter() kernel-doc comment

On Thu, Mar 25, 2021 at 8:56 AM Steven Rostedt <rostedt@...dmis.org> wrote:
>
> On Sat, 20 Mar 2021 11:39:16 +0000
> Qiujun Huang <hqjagain@...il.com> wrote:
>
> > commit f306cc82a93d ("tracing: Update event filters for multibuffer")
> > added the parameter @tr for create_system_filter().
> >
> > commit bb9ef1cb7d86 ("tracing: Change apply_subsystem_event_filter() paths to
> > check file->system == dir")
> > changed the parameter from @system to @dir.
> >
> > commit 1e144d73f729 ("tracing: Add trace_array parameter to
> > create_event_filter()")
> > added the parameter @tr for create_filter().
> >
> > Signed-off-by: Qiujun Huang <hqjagain@...il.com>
> > ---
> >  kernel/trace/trace_events_filter.c | 6 ++++--
> >  1 file changed, 4 insertions(+), 2 deletions(-)
> >
> > diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
> > index e91259f6a722..00e78a012de9 100644
> > --- a/kernel/trace/trace_events_filter.c
> > +++ b/kernel/trace/trace_events_filter.c
> > @@ -1693,6 +1693,7 @@ static void create_filter_finish(struct filter_parse_error *pe)
> >
> >  /**
> >   * create_filter - create a filter for a trace_event_call
> > + * @tr: the trace array associated with these events
>
> This looks fine.
>
> >   * @call: trace_event_call to create a filter for
> >   * @filter_str: filter string
> >   * @set_str: remember @filter_str and enable detailed error in filter
> > @@ -1741,8 +1742,9 @@ int create_event_filter(struct trace_array *tr,
> >  }
> >
> >  /**
> > - * create_system_filter - create a filter for an event_subsystem
> > - * @system: event_subsystem to create a filter for
> > + * create_system_filter - create a filter for an event_subsystem_dir
>
> Do you know what a "event_subsystem_dir" is? I don't.
>
> In fact, the original text makes much more sense. You could remove the
> "_" and have it say "event subsystem".
>
>
> > + * @dir: event_subsystem_dir to create a filter for
>
> I have no idea what the above text even means. @dir is the descriptor
> for the system directory.

Get that.

>
> > + * @tr: the trace array associated with these events
> >   * @filter_str: filter string
> >   * @filterp: out param for created filter (always updated on return)
> >   *
>
> Looking at the code I think it should have another clean up, as where
> both @dir and @tr as passed it, it should just pass in @dir, because
> @tr is simply @dir->tr.

I'll clean it up in another patch.

>
> -- Steve

Thanks