Re: [PATCH] fprobe: Use guard(rcu_sched_notrace) and check rcu_is_watching()

[Steven Rostedt]

On Tue, 29 Sep 2026 09:19:12 +0900
"Masami Hiramatsu (Google)" <mhiramat@xxxxxxxxxx> wrote:

> @@ -329,16 +333,14 @@ static void fprobe_ftrace_entry(unsigned long ip, unsigned long parent_ip,
>  	struct fprobe *fp;
>  	int bit;
>  
> +	if (!rcu_is_watching())
> +		return;
> +

I'm thinking these should really be:

	if (WARN_ON_ONCE(!rcu_is_watching()))
		return;

-- Steve