Re: [PATCH v3] kernel/trace: fixed static warnings

[Masami Hiramatsu (Google) <mhiramat@kernel.org>]

On Mon,  6 Apr 2026 08:00:36 +0200
abhijithsriram95@gmail.com wrote:

> From: Abhijith Sriram <abhijithsriram95@gmail.com>
> 
> The change in the function argument description
> was due to the static code checker script reading
> the word filter back to back
> 
> Changes in v2:
> - corrected *m = file->private_data to m = file->private_data
> 
> Changes in v3:
> - reverted the changes for struct seq_file *m and
>   added a new empty line instead
> 
> Signed-off-by: Abhijith Sriram <abhijithsriram95@gmail.com>
> ---
>  kernel/trace/trace_events_trigger.c | 8 +++++---
>  new-changes                         | 6 ++++++
>  2 files changed, 11 insertions(+), 3 deletions(-)
>  create mode 100644 new-changes
> 
> diff --git a/kernel/trace/trace_events_trigger.c b/kernel/trace/trace_events_trigger.c
> index 655db2e82513..08adb593fcd9 100644
> --- a/kernel/trace/trace_events_trigger.c
> +++ b/kernel/trace/trace_events_trigger.c
> @@ -246,7 +246,7 @@ event_triggers_post_call(struct trace_event_file *file,
>  }
>  EXPORT_SYMBOL_GPL(event_triggers_post_call);
>  
> -#define SHOW_AVAILABLE_TRIGGERS	(void *)(1UL)
> +#define SHOW_AVAILABLE_TRIGGERS	((void *)(1UL))
>  
>  static void *trigger_next(struct seq_file *m, void *t, loff_t *pos)
>  {
> @@ -352,6 +352,7 @@ static int event_trigger_regex_open(struct inode *inode, struct file *file)
>  		ret = seq_open(file, &event_triggers_seq_ops);
>  		if (!ret) {
>  			struct seq_file *m = file->private_data;
> +
>  			m->private = file;
>  		}
>  	}
> @@ -388,9 +389,9 @@ static ssize_t event_trigger_regex_write(struct file *file,
>  					 const char __user *ubuf,
>  					 size_t cnt, loff_t *ppos)
>  {
> +	char *buf __free(kfree) = NULL;
>  	struct trace_event_file *event_file;
>  	ssize_t ret;
> -	char *buf __free(kfree) = NULL;

Again, this is not OK. Even if checkpatch.pl complained against this,
there should be no problem. Only if you think this is not sorted by
length, you can do:

 	struct trace_event_file *event_file;
+	char *buf __free(kfree) = NULL;
 	ssize_t ret;
-	char *buf __free(kfree) = NULL;

This change is acceptable as a cosmetic change.

>  
>  	if (!cnt)
>  		return 0;
> @@ -633,6 +634,7 @@ clear_event_triggers(struct trace_array *tr)
>  
>  	list_for_each_entry(file, &tr->events, list) {
>  		struct event_trigger_data *data, *n;
> +
>  		list_for_each_entry_safe(data, n, &file->triggers, list) {
>  			trace_event_trigger_enable_disable(file, 0);
>  			list_del_rcu(&data->list);
> @@ -785,7 +787,7 @@ static void unregister_trigger(char *glob,
>   *   cmd               - the trigger command name
>   *   glob              - the trigger command name optionally prefaced with '!'
>   *   param_and_filter  - text following cmd and ':'
> - *   param             - text following cmd and ':' and stripped of filter
> + *   param             - text following cmd and ':' and filter removed
>   *   filter            - the optional filter text following (and including) 'if'
>   *
>   * To illustrate the use of these components, here are some concrete
> diff --git a/new-changes b/new-changes
> new file mode 100644
> index 000000000000..9e3a24de3033
> --- /dev/null
> +++ b/new-changes
> @@ -0,0 +1,6 @@
> +Line 25 -> adding const to the pointer address as well.
> +
> +linw 1193 -> removing else because there is a return statement in the if condition
> +line 1727 -> adding new line after statement
> +line 1800 -> reordering to solve missing a blank line warning
> +line 12364 -> changed the function to kstrtoul
> \ No newline at end of file

Is this your working note?
Please remove it.

Thank you,

> -- 
> 2.43.0
> 


-- 
Masami Hiramatsu (Google) <mhiramat@kernel.org>