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

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

On Thu,  2 Apr 2026 21:54:04 +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
> 
> Signed-off-by: Abhijith Sriram <abhijithsriram95@gmail.com>
> ---
>  kernel/trace/trace_events_trigger.c | 10 ++++++----
>  1 file changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/kernel/trace/trace_events_trigger.c b/kernel/trace/trace_events_trigger.c
> index 655db2e82513..477d8dee3362 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))

This is OK.

>  
>  static void *trigger_next(struct seq_file *m, void *t, loff_t *pos)
>  {
> @@ -325,6 +325,7 @@ static const struct seq_operations event_triggers_seq_ops = {
>  static int event_trigger_regex_open(struct inode *inode, struct file *file)
>  {
>  	int ret;
> +	struct seq_file *m = NULL;
>  
>  	ret = security_locked_down(LOCKDOWN_TRACEFS);
>  	if (ret)
> @@ -351,7 +352,7 @@ static int event_trigger_regex_open(struct inode *inode, struct file *file)
>  	if (file->f_mode & FMODE_READ) {
>  		ret = seq_open(file, &event_triggers_seq_ops);
>  		if (!ret) {
> -			struct seq_file *m = file->private_data;
> +			*m = file->private_data;

Why is this change required?

>  			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;

What is this change?

Thanks,

>  
>  	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
> -- 
> 2.43.0
> 


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