linux-kernel - [PATCH] serial: cpm_uart: Protect udbg definitions by CONFIG_SERIAL_CPM

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Date:   Wed, 27 Oct 2021 09:53:26 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Christophe Leroy <christophe.leroy@...roup.eu>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>
Cc:     Arnd Bergmann <arnd@...db.de>, linux-serial@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: [PATCH] serial: cpm_uart: Protect udbg definitions by CONFIG_SERIAL_CPM_CONSOLE

If CONFIG_CONSOLE_POLL=y, and CONFIG_SERIAL_CPM=m (hence
CONFIG_SERIAL_CPM_CONSOLE=n):

    drivers/tty/serial/cpm_uart/cpm_uart_core.c:1109:12: warning: ‘udbg_cpm_getc’ defined but not used [-Wunused-function]
     1109 | static int udbg_cpm_getc(void)
	  |            ^~~~~~~~~~~~~
    drivers/tty/serial/cpm_uart/cpm_uart_core.c:1095:13: warning: ‘udbg_cpm_putc’ defined but not used [-Wunused-function]
     1095 | static void udbg_cpm_putc(char c)
	  |             ^~~~~~~~~~~~~

Fix this by making the udbg definitions depend on
CONFIG_SERIAL_CPM_CONSOLE, in addition to CONFIG_CONSOLE_POLL.

Fixes: a60526097f42eb98 ("tty: serial: cpm_uart: Add udbg support for enabling xmon")
Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
---
One more casualty of CONFIG_WERROR=y.
http://kisskb.ellerman.id.au/kisskb/buildresult/14652935/
---
 drivers/tty/serial/cpm_uart/cpm_uart_core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/tty/serial/cpm_uart/cpm_uart_core.c b/drivers/tty/serial/cpm_uart/cpm_uart_core.c
index c719aa2b18328321..d6d3db9c3b1f83ab 100644
--- a/drivers/tty/serial/cpm_uart/cpm_uart_core.c
+++ b/drivers/tty/serial/cpm_uart/cpm_uart_core.c
@@ -1090,6 +1090,7 @@ static void cpm_put_poll_char(struct uart_port *port,
 	cpm_uart_early_write(pinfo, ch, 1, false);
 }
 
+#ifdef CONFIG_SERIAL_CPM_CONSOLE
 static struct uart_port *udbg_port;
 
 static void udbg_cpm_putc(char c)
@@ -1114,6 +1115,7 @@ static int udbg_cpm_getc(void)
 		cpu_relax();
 	return c;
 }
+#endif /* CONFIG_SERIAL_CPM_CONSOLE */
 
 #endif /* CONFIG_CONSOLE_POLL */
 
-- 
2.25.1