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Date:   Tue, 18 Aug 2020 14:54:59 -0400
From:   Tong Zhang <ztong0001@...il.com>
To:     gregkh@...uxfoundation.org, jirislaby@...nel.org, robh@...nel.org,
        linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     ztong0001@...il.com, kernel test robot <lkp@...el.com>
Subject: [PATCH v4] tty: serial: earlycon dependency

parse_options() in drivers/tty/serial/earlycon.c calls uart_parse_earlycon
in drivers/tty/serial/serial_core.c therefore selecting SERIAL_EARLYCON
should automatically select SERIAL_CORE, otherwise will result in symbol
not found error during linking if SERIAL_CORE is not configured as builtin

Signed-off-by: Tong Zhang <ztong0001@...il.com>
---

Fixes: 9aac5887595b ("tty/serial: add generic serial earlycon")
v2: I made an attempt to fix the commit log
v3: I made another attempt to fix the commit log and I also changed
select to depends according to Jiri's comment
v4: fixed another stupid error -- should be "depends on" not "depends"
Reported-by: kernel test robot <lkp@...el.com>

 drivers/tty/serial/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index 8a0352eb337c..759ac4a5a5c5 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -8,6 +8,7 @@ menu "Serial drivers"
 
 config SERIAL_EARLYCON
 	bool
+	depends on SERIAL_CORE
 	help
 	  Support for early consoles with the earlycon parameter. This enables
 	  the console before standard serial driver is probed. The console is
-- 
2.25.1

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