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Date: Fri, 27 May 2022 08:39:21 +0900
From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: Yuntao Wang <ytcoode@...il.com>, Ingo Molnar <mingo@...hat.com>,
linux-kernel@...r.kernel.org,
Masami Hiramatsu <mhiramat@...nel.org>
Subject: Re: [PATCH v3] tracing: Use trace_create_file() to simplify
creation of tracefs entries
On Tue, 24 May 2022 12:07:13 -0400
Steven Rostedt <rostedt@...dmis.org> wrote:
> On Fri, 14 Jan 2022 21:10:52 +0800
> Yuntao Wang <ytcoode@...il.com> wrote:
>
> > Creating tracefs entries with tracefs_create_file() followed by pr_warn()
> > is tedious and repetitive, we can use trace_create_file() to simplify
> > this process and make the code more readable.
>
> Sorry I missed this patch (I was in the process of changing jobs when it
> was sent out, and I had COVID :-p ). I'll add it to my queue.
>
> Masami, this touches trace_kprobes.c, care to ACK that part?
Yes, trace_kprobes.c part looks good to me.
Acked-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
Thank you!
>
> Thanks,
>
> -- Steve
>
>
> >
> > Signed-off-by: Yuntao Wang <ytcoode@...il.com>
> > ---
> > Changes since v1:
> > - Remove format change updates
> >
> > Changes since v2:
> > - Remove unused variables
> >
> > kernel/trace/ftrace.c | 9 +++------
> > kernel/trace/trace_dynevent.c | 9 ++-------
> > kernel/trace/trace_events.c | 29 +++++++++------------------
> > kernel/trace/trace_kprobe.c | 15 ++++----------
> > kernel/trace/trace_recursion_record.c | 7 ++-----
> > 5 files changed, 21 insertions(+), 48 deletions(-)
> >
> > diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
> > index 403e485bf091..6d9bb73d19d3 100644
> > --- a/kernel/trace/ftrace.c
> > +++ b/kernel/trace/ftrace.c
> > @@ -952,7 +952,6 @@ static struct tracer_stat function_stats __initdata = {
> > static __init void ftrace_profile_tracefs(struct dentry *d_tracer)
> > {
> > struct ftrace_profile_stat *stat;
> > - struct dentry *entry;
> > char *name;
> > int ret;
> > int cpu;
> > @@ -983,11 +982,9 @@ static __init void ftrace_profile_tracefs(struct dentry *d_tracer)
> > }
> > }
> >
> > - entry = tracefs_create_file("function_profile_enabled",
> > - TRACE_MODE_WRITE, d_tracer, NULL,
> > - &ftrace_profile_fops);
> > - if (!entry)
> > - pr_warn("Could not create tracefs 'function_profile_enabled' entry\n");
> > + trace_create_file("function_profile_enabled",
> > + TRACE_MODE_WRITE, d_tracer, NULL,
> > + &ftrace_profile_fops);
> > }
> >
> > #else /* CONFIG_FUNCTION_PROFILER */
> > diff --git a/kernel/trace/trace_dynevent.c b/kernel/trace/trace_dynevent.c
> > index e34e8182ee4b..076b447a1b88 100644
> > --- a/kernel/trace/trace_dynevent.c
> > +++ b/kernel/trace/trace_dynevent.c
> > @@ -255,19 +255,14 @@ static const struct file_operations dynamic_events_ops = {
> > /* Make a tracefs interface for controlling dynamic events */
> > static __init int init_dynamic_event(void)
> > {
> > - struct dentry *entry;
> > int ret;
> >
> > ret = tracing_init_dentry();
> > if (ret)
> > return 0;
> >
> > - entry = tracefs_create_file("dynamic_events", TRACE_MODE_WRITE, NULL,
> > - NULL, &dynamic_events_ops);
> > -
> > - /* Event list interface */
> > - if (!entry)
> > - pr_warn("Could not create tracefs 'dynamic_events' entry\n");
> > + trace_create_file("dynamic_events", TRACE_MODE_WRITE, NULL,
> > + NULL, &dynamic_events_ops);
> >
> > return 0;
> > }
> > diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
> > index 3147614c1812..718518b3c491 100644
> > --- a/kernel/trace/trace_events.c
> > +++ b/kernel/trace/trace_events.c
> > @@ -3446,12 +3446,10 @@ create_event_toplevel_files(struct dentry *parent, struct trace_array *tr)
> > struct dentry *d_events;
> > struct dentry *entry;
> >
> > - entry = tracefs_create_file("set_event", TRACE_MODE_WRITE, parent,
> > - tr, &ftrace_set_event_fops);
> > - if (!entry) {
> > - pr_warn("Could not create tracefs 'set_event' entry\n");
> > + entry = trace_create_file("set_event", TRACE_MODE_WRITE, parent,
> > + tr, &ftrace_set_event_fops);
> > + if (!entry)
> > return -ENOMEM;
> > - }
> >
> > d_events = tracefs_create_dir("events", parent);
> > if (!d_events) {
> > @@ -3466,16 +3464,12 @@ create_event_toplevel_files(struct dentry *parent, struct trace_array *tr)
> >
> > /* There are not as crucial, just warn if they are not created */
> >
> > - entry = tracefs_create_file("set_event_pid", TRACE_MODE_WRITE, parent,
> > - tr, &ftrace_set_event_pid_fops);
> > - if (!entry)
> > - pr_warn("Could not create tracefs 'set_event_pid' entry\n");
> > + trace_create_file("set_event_pid", TRACE_MODE_WRITE, parent,
> > + tr, &ftrace_set_event_pid_fops);
> >
> > - entry = tracefs_create_file("set_event_notrace_pid",
> > - TRACE_MODE_WRITE, parent, tr,
> > - &ftrace_set_event_notrace_pid_fops);
> > - if (!entry)
> > - pr_warn("Could not create tracefs 'set_event_notrace_pid' entry\n");
> > + trace_create_file("set_event_notrace_pid",
> > + TRACE_MODE_WRITE, parent, tr,
> > + &ftrace_set_event_notrace_pid_fops);
> >
> > /* ring buffer internal formats */
> > trace_create_file("header_page", TRACE_MODE_READ, d_events,
> > @@ -3690,17 +3684,14 @@ static __init int event_trace_init_fields(void)
> > __init int event_trace_init(void)
> > {
> > struct trace_array *tr;
> > - struct dentry *entry;
> > int ret;
> >
> > tr = top_trace_array();
> > if (!tr)
> > return -ENODEV;
> >
> > - entry = tracefs_create_file("available_events", TRACE_MODE_READ,
> > - NULL, tr, &ftrace_avail_fops);
> > - if (!entry)
> > - pr_warn("Could not create tracefs 'available_events' entry\n");
> > + trace_create_file("available_events", TRACE_MODE_READ,
> > + NULL, tr, &ftrace_avail_fops);
> >
> > ret = early_event_add_tracer(NULL, tr);
> > if (ret)
> > diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
> > index 3d85323278ed..5c35c2311690 100644
> > --- a/kernel/trace/trace_kprobe.c
> > +++ b/kernel/trace/trace_kprobe.c
> > @@ -1906,25 +1906,18 @@ core_initcall(init_kprobe_trace_early);
> > static __init int init_kprobe_trace(void)
> > {
> > int ret;
> > - struct dentry *entry;
> >
> > ret = tracing_init_dentry();
> > if (ret)
> > return 0;
> >
> > - entry = tracefs_create_file("kprobe_events", TRACE_MODE_WRITE,
> > - NULL, NULL, &kprobe_events_ops);
> > -
> > /* Event list interface */
> > - if (!entry)
> > - pr_warn("Could not create tracefs 'kprobe_events' entry\n");
> > + trace_create_file("kprobe_events", TRACE_MODE_WRITE,
> > + NULL, NULL, &kprobe_events_ops);
> >
> > /* Profile interface */
> > - entry = tracefs_create_file("kprobe_profile", TRACE_MODE_READ,
> > - NULL, NULL, &kprobe_profile_ops);
> > -
> > - if (!entry)
> > - pr_warn("Could not create tracefs 'kprobe_profile' entry\n");
> > + trace_create_file("kprobe_profile", TRACE_MODE_READ,
> > + NULL, NULL, &kprobe_profile_ops);
> >
> > setup_boot_kprobe_events();
> >
> > diff --git a/kernel/trace/trace_recursion_record.c b/kernel/trace/trace_recursion_record.c
> > index 4d4b78c8ca25..a520b11afb0d 100644
> > --- a/kernel/trace/trace_recursion_record.c
> > +++ b/kernel/trace/trace_recursion_record.c
> > @@ -224,12 +224,9 @@ static const struct file_operations recursed_functions_fops = {
> >
> > __init static int create_recursed_functions(void)
> > {
> > - struct dentry *dentry;
> >
> > - dentry = trace_create_file("recursed_functions", TRACE_MODE_WRITE,
> > - NULL, NULL, &recursed_functions_fops);
> > - if (!dentry)
> > - pr_warn("WARNING: Failed to create recursed_functions\n");
> > + trace_create_file("recursed_functions", TRACE_MODE_WRITE,
> > + NULL, NULL, &recursed_functions_fops);
> > return 0;
> > }
> >
>
--
Masami Hiramatsu (Google) <mhiramat@...nel.org>
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