linux-kernel - Re: [PATCH v5 2/4] tracing: Make the backup instance non-reusable

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Message-Id: <20260130180135.7dd5b3731bf242d8d5e907c7@kernel.org>
Date: Fri, 30 Jan 2026 18:01:35 +0900
From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org
Subject: Re: [PATCH v5 2/4] tracing: Make the backup instance non-reusable

On Thu, 29 Jan 2026 14:53:33 -0500
Steven Rostedt <rostedt@...dmis.org> wrote:

> On Wed, 28 Jan 2026 09:09:56 +0900
> "Masami Hiramatsu (Google)" <mhiramat@...nel.org> wrote:
> 
> > @@ -9388,12 +9405,16 @@ static void
> >  tracing_init_tracefs_percpu(struct trace_array *tr, long cpu)
> >  {
> >  	struct dentry *d_percpu = tracing_dentry_percpu(tr, cpu);
> > +	umode_t writable_mode = TRACE_MODE_WRITE;
> >  	struct dentry *d_cpu;
> >  	char cpu_dir[30]; /* 30 characters should be more than enough */
> >  
> >  	if (!d_percpu)
> >  		return;
> >  
> > +	if (trace_array_is_readonly(tr))
> > +		writable_mode = TRACE_MODE_READ;
> 
> Hmm, writable_mode is set but not used?

Oops, good catch! I missed to update it.

Thanks!

> 
> Looks like you missed an update.
> 
> -- Steve
> 
> > +
> >  	snprintf(cpu_dir, 30, "cpu%ld", cpu);
> >  	d_cpu = tracefs_create_dir(cpu_dir, d_percpu);
> >  	if (!d_cpu) {
> > @@ -9616,7 +9637,6 @@ struct dentry *trace_create_file(const char *name,
> >  	return ret;
> >  }


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