linux-kernel - [PATCH v2 1/3] printk: Constify name for add_preferred

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Message-ID: <20230912110350.14482-2-tony@atomide.com>
Date:   Tue, 12 Sep 2023 14:03:43 +0300
From:   Tony Lindgren <tony@...mide.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        John Ogness <john.ogness@...utronix.de>
Cc:     Andy Shevchenko <andriy.shevchenko@...el.com>,
        Dhruva Gole <d-gole@...com>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        Johan Hovold <johan@...nel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org
Subject: [PATCH v2 1/3] printk: Constify name for add_preferred_console()

While adding a preferred console handling for serial_core for serial port
hardware based device addressing, Jiri suggested we constify name for
add_preferred_console(). The gets copied anyways. This allows serial core
to add a preferred console using serial drv->dev_name without copying it.

Note that constifying options causes changes all over the place because of
struct console for match().

Cc: John Ogness <john.ogness@...utronix.de>
Cc: Petr Mladek <pmladek@...e.com>
Cc: Sergey Senozhatsky <senozhatsky@...omium.org>
Cc: Steven Rostedt <rostedt@...dmis.org>
Suggested-by: Jiri Slaby <jirislaby@...nel.org>
Signed-off-by: Tony Lindgren <tony@...mide.com>
---
 include/linux/console.h | 2 +-
 kernel/printk/printk.c  | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/linux/console.h b/include/linux/console.h
--- a/include/linux/console.h
+++ b/include/linux/console.h
@@ -337,7 +337,7 @@ enum con_flush_mode {
 	CONSOLE_REPLAY_ALL,
 };
 
-extern int add_preferred_console(char *name, int idx, char *options);
+extern int add_preferred_console(const char *name, int idx, char *options);
 extern void console_force_preferred_locked(struct console *con);
 extern void register_console(struct console *);
 extern int unregister_console(struct console *);
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -2400,7 +2400,7 @@ static void set_user_specified(struct console_cmdline *c, bool user_specified)
 	console_set_on_cmdline = 1;
 }
 
-static int __add_preferred_console(char *name, int idx, char *options,
+static int __add_preferred_console(const char *name, int idx, char *options,
 				   char *brl_options, bool user_specified)
 {
 	struct console_cmdline *c;
@@ -2509,7 +2509,7 @@ __setup("console=", console_setup);
  * commonly to provide a default console (ie from PROM variables) when
  * the user has not supplied one.
  */
-int add_preferred_console(char *name, int idx, char *options)
+int add_preferred_console(const char *name, int idx, char *options)
 {
 	return __add_preferred_console(name, idx, options, NULL, false);
 }
-- 
2.42.0