From: Steven Rostedt <rostedt@goodmis.org>
To: Wei Yang <richard.weiyang@linux.alibaba.com>
Cc: mingo@redhat.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 5/5] tracing: toplevel d_entry already initialized
Date: Thu, 9 Jul 2020 18:13:59 -0400 [thread overview]
Message-ID: <20200709181359.42b4e61e@oasis.local.home> (raw)
In-Reply-To: <20200703020612.12930-5-richard.weiyang@linux.alibaba.com>
On Fri, 3 Jul 2020 10:06:12 +0800
Wei Yang <richard.weiyang@linux.alibaba.com> wrote:
> Currently we have following call flow:
>
> tracer_init_tracefs()
> tracing_init_dentry()
> event_trace_init()
> tracing_init_dentry()
>
> This shows tracing_init_dentry() is called twice in this flow and this
> is not necessary.
There's no reason to have patch 4 and 5 separate. Fold the two together.
If you want, you can create another patch that changes
tracing_init_dentry() to return a integer, as you point out, it never
returns an actual dentry. No reason for having it return a pointer then.
-- Steve
>
> Let's remove the second one when it is for sure be properly initialized.
>
> Signed-off-by: Wei Yang <richard.weiyang@linux.alibaba.com>
> ---
> kernel/trace/trace_events.c | 5 -----
> 1 file changed, 5 deletions(-)
>
> diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
> index 8b3aa57dcea6..76879b29cf33 100644
> --- a/kernel/trace/trace_events.c
> +++ b/kernel/trace/trace_events.c
> @@ -3434,7 +3434,6 @@ early_initcall(event_trace_enable_again);
> __init int event_trace_init(void)
> {
> struct trace_array *tr;
> - struct dentry *d_tracer;
> struct dentry *entry;
> int ret;
>
> @@ -3442,10 +3441,6 @@ __init int event_trace_init(void)
> if (!tr)
> return -ENODEV;
>
> - d_tracer = tracing_init_dentry();
> - if (IS_ERR(d_tracer))
> - return 0;
> -
> entry = tracefs_create_file("available_events", 0444, NULL,
> tr, &ftrace_avail_fops);
> if (!entry)
next prev parent reply other threads:[~2020-07-09 22:14 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-03 2:06 [PATCH 1/5] tracing: use union to simplify the trace_event_functions initialization Wei Yang
2020-07-03 2:06 ` [PATCH 2/5] tracing: simplify the logic by defining next to be "lasst + 1" Wei Yang
2020-07-09 21:59 ` Steven Rostedt
2020-07-03 2:06 ` [PATCH 3/5] tracing: save one trace_event->type by using __TRACE_LAST_TYPE Wei Yang
2020-07-09 22:04 ` Steven Rostedt
2020-07-03 2:06 ` [PATCH 4/5] tracing: use NULL directly to create root level tracefs Wei Yang
2020-07-03 2:06 ` [PATCH 5/5] tracing: toplevel d_entry already initialized Wei Yang
2020-07-09 22:13 ` Steven Rostedt [this message]
2020-07-10 1:11 ` Wei Yang
2020-07-10 13:08 ` Steven Rostedt
2020-07-09 21:57 ` [PATCH 1/5] tracing: use union to simplify the trace_event_functions initialization Steven Rostedt
2020-07-10 1:10 ` Wei Yang
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