linux-kernel - [PATCH] powerpc/legacy_serial: check CONFIG_SERIAL_8250

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Message-Id: <20230609003328.15008-1-rdunlap@infradead.org>
Date:   Thu,  8 Jun 2023 17:33:28 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     linux-kernel@...r.kernel.org
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-serial@...r.kernel.org,
        Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH] powerpc/legacy_serial: check CONFIG_SERIAL_8250_CONSOLE

When SERIAL_8250_CONSOLE is not set but PPC_UDBG_16550=y,
the legacy_serial code references fsl8250_handle_irq, which is
only built when SERIAL_8250_CONSOLE is set.

Be consistent in referencing the used CONFIG_SERIAL_8250*
symbols so that the build errors do not happen.

Prevents these build errors:

powerpc-linux-ld: arch/powerpc/kernel/legacy_serial.o: in function `serial_dev_init':
legacy_serial.c:(.init.text+0x2aa): undefined reference to `fsl8250_handle_irq'
powerpc-linux-ld: legacy_serial.c:(.init.text+0x2b2): undefined reference to `fsl8250_handle_irq'

Fixes: 66eff0ef528b ("powerpc/legacy_serial: Warn about 8250 devices operated without active FSL workarounds")
Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
Cc: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-serial@...r.kernel.org
Cc: Michael Ellerman <mpe@...erman.id.au>
Cc: Nicholas Piggin <npiggin@...il.com>
Cc: Christophe Leroy <christophe.leroy@...roup.eu>
Cc: linuxppc-dev@...ts.ozlabs.org
---
 arch/powerpc/kernel/legacy_serial.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff -- a/arch/powerpc/kernel/legacy_serial.c b/arch/powerpc/kernel/legacy_serial.c
--- a/arch/powerpc/kernel/legacy_serial.c
+++ b/arch/powerpc/kernel/legacy_serial.c
@@ -508,9 +508,9 @@ static void __init fixup_port_irq(int in
 
 	port->irq = virq;
 
-	if (IS_ENABLED(CONFIG_SERIAL_8250) &&
+	if (IS_ENABLED(CONFIG_SERIAL_8250_CONSOLE) &&
 	    of_device_is_compatible(np, "fsl,ns16550")) {
-		if (IS_REACHABLE(CONFIG_SERIAL_8250)) {
+		if (IS_REACHABLE(CONFIG_SERIAL_8250_CONSOLE)) {
 			port->handle_irq = fsl8250_handle_irq;
 			port->has_sysrq = IS_ENABLED(CONFIG_SERIAL_8250_CONSOLE);
 		} else {