linux-kernel - Re: [RFC][PATCH] tracing: Deprecate auto-mounting tracefs in debugfs

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Message-ID: <20250617152906.2d7ddb9f@gandalf.local.home>
Date: Tue, 17 Jun 2025 15:29:06 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: LKML <linux-kernel@...r.kernel.org>, Linux Trace Kernel
 <linux-trace-kernel@...r.kernel.org>, "linux-trace-users@...r.kernel.org"
 <linux-trace-users@...r.kernel.org>, linux-fsdevel@...r.kernel.org,
 linux-perf-users@...r.kernel.org
Cc: Masami Hiramatsu <mhiramat@...nel.org>, Mathieu Desnoyers
 <mathieu.desnoyers@...icios.com>, Mark Rutland <mark.rutland@....com>,
 Peter Zijlstra <peterz@...radead.org>, Thomas Gleixner
 <tglx@...utronix.de>, Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
 Namhyung Kim <namhyung@...nel.org>, Linus Torvalds
 <torvalds@...ux-foundation.org>, Andrew Morton <akpm@...ux-foundation.org>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Al Viro
 <viro@...IV.linux.org.uk>, Christian Brauner <brauner@...nel.org>, Jan Kara
 <jack@...e.cz>, Arnaldo Carvalho de Melo <acme@...nel.org>, Frederic
 Weisbecker <fweisbec@...il.com>, Jiri Olsa <jolsa@...nel.org>, Ian Rogers
 <irogers@...gle.com>
Subject: Re: [RFC][PATCH] tracing: Deprecate auto-mounting tracefs in
 debugfs

On Tue, 17 Jun 2025 13:36:14 -0400
Steven Rostedt <rostedt@...dmis.org> wrote:

> @@ -10311,6 +10313,8 @@ int tracing_init_dentry(void)
>  	if (WARN_ON(!tracefs_initialized()))
>  		return -ENODEV;
>  
> +#ifdef CONFIG_TRACEFS_AUTOMOUNT_DEPRECATED
> +	pr_warning("NOTICE: Automounting of tracing to debugfs is deprecated and will be removed in 2027\n");

I tested this with the config off but not on.

The above errors with pr_warning() undefined, "do you mean pr_warn?" :-p

-- Steve

>  	/*
>  	 * As there may still be users that expect the tracing
>  	 * files to exist in debugfs/tracing, we must automount
> @@ -10319,6 +10323,7 @@ int tracing_init_dentry(void)
>  	 */
>  	tr->dir = debugfs_create_automount("tracing", NULL,
>  					   trace_automount, NULL);
> +#endif
>  
>  	return 0;
>  }
> --