Re: [PATCH 4/4] tracing/mmiotrace: Clean up coding style and redundant debug logs

[Steven Rostedt]

On Tue, 28 Jul 2026 21:50:19 +0900
"Masami Hiramatsu (Google)" <mhiramat@xxxxxxxxxx> wrote:

> From: Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>
> 
> Clean up coding style issues in trace_mmiotrace.c:
> - Remove redundant pr_debug() entries in tracer callbacks.
> - Fix opening brace placement for mmio_tracer.
> - Prefer 'unsigned int' to bare 'unsigned'.
> - Add missing blank lines after local variable declarations.
> 
> Assisted-by: Antigravity:gemini-3.6-flash
> Signed-off-by: Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>
> ---
>  kernel/trace/trace_mmiotrace.c |   16 +++++++---------
>  1 file changed, 7 insertions(+), 9 deletions(-)
> 
> diff --git a/kernel/trace/trace_mmiotrace.c b/kernel/trace/trace_mmiotrace.c
> index 77120d467e11..ce16e1c53d12 100644
> --- a/kernel/trace/trace_mmiotrace.c
> +++ b/kernel/trace/trace_mmiotrace.c
> @@ -36,7 +36,6 @@ static void mmio_reset_data(struct trace_array *tr)
>  
>  static int mmio_trace_init(struct trace_array *tr)
>  {
> -	pr_debug("in %s\n", __func__);

So how are these redundant?

Are there pr_debug() prints elsewhere?

>  	mmio_trace_array = tr;
>  
>  	mmio_reset_data(tr);
> @@ -46,8 +45,6 @@ static int mmio_trace_init(struct trace_array *tr)
>  
>  static void mmio_trace_reset(struct trace_array *tr)
>  {
> -	pr_debug("in %s\n", __func__);
> -
>  	disable_mmiotrace();
>  	mmio_reset_data(tr);
>  	mmio_trace_array = NULL;
> @@ -55,7 +52,6 @@ static void mmio_trace_reset(struct trace_array *tr)
>  
>  static void mmio_trace_start(struct trace_array *tr)
>  {
> -	pr_debug("in %s\n", __func__);
>  	mmio_reset_data(tr);
>  }
>  
> @@ -113,6 +109,7 @@ static void mmio_pipe_open(struct trace_iterator *iter)
>  static void mmio_close(struct trace_iterator *iter)
>  {
>  	struct header_iter *hiter = iter->private;
> +
>  	destroy_header_iter(hiter);
>  	iter->private = NULL;
>  }

This is fine.

> @@ -170,7 +167,7 @@ static enum print_line_t mmio_print_rw(struct trace_iterator *iter)
>  	struct trace_seq *s	= &iter->seq;
>  	unsigned long long t	= ns2usecs(iter->ts);
>  	unsigned long usec_rem	= do_div(t, USEC_PER_SEC);
> -	unsigned secs		= (unsigned long)t;
> +	unsigned int secs	= (unsigned long)t;
>  

OK.

>  	trace_assign_type(field, entry);
>  	rw = &field->rw;
> @@ -215,7 +212,7 @@ static enum print_line_t mmio_print_map(struct trace_iterator *iter)
>  	struct trace_seq *s	= &iter->seq;
>  	unsigned long long t	= ns2usecs(iter->ts);
>  	unsigned long usec_rem	= do_div(t, USEC_PER_SEC);
> -	unsigned secs		= (unsigned long)t;
> +	unsigned int secs	= (unsigned long)t;
>  
>  	trace_assign_type(field, entry);
>  	m = &field->map;
> @@ -249,7 +246,7 @@ static enum print_line_t mmio_print_mark(struct trace_iterator *iter)
>  	struct trace_seq *s	= &iter->seq;
>  	unsigned long long t	= ns2usecs(iter->ts);
>  	unsigned long usec_rem	= do_div(t, USEC_PER_SEC);
> -	unsigned secs		= (unsigned long)t;
> +	unsigned int secs	= (unsigned long)t;
>  
>  	trace_assign_type(print, entry);
>  	msg = print->buf;
> @@ -274,8 +271,7 @@ static enum print_line_t mmio_print_line(struct trace_iterator *iter)
>  	}
>  }
>  
> -static struct tracer mmio_tracer __read_mostly =
> -{
> +static struct tracer mmio_tracer __read_mostly = {

OK.

>  	.name		= "mmiotrace",
>  	.init		= mmio_trace_init,
>  	.reset		= mmio_trace_reset,
> @@ -322,6 +318,7 @@ static void __trace_mmiotrace_rw(struct trace_array *tr,
>  void mmio_trace_rw(struct mmiotrace_rw *rw)
>  {
>  	struct trace_array *tr = mmio_trace_array;
> +
>  	__trace_mmiotrace_rw(tr, rw);
>  }
>  
> @@ -353,6 +350,7 @@ static void __trace_mmiotrace_map(struct trace_array *tr,
>  void mmio_trace_mapping(struct mmiotrace_map *map)
>  {
>  	struct trace_array *tr = mmio_trace_array;
> +
>  	__trace_mmiotrace_map(tr, map);
>  }

Honestly, for one line functions like the above, I think it looks better
without that blank line.

-- Steve