tty: serial: sh-sci: Add default for number of ports for compile-testing

This change “tty: serial: sh-sci: Add default for number of ports for compile-testing” in Linux kernel is authored by Geert Uytterhoeven <geert+renesas [at] glider.be> on Mon Dec 18 09:50:57 2017 +0100.

tty: serial: sh-sci: Add default for number of ports for compile-testing

When compile-testing an allmodconfig kernel for a platform without
sh-sci serial ports, the SERIAL_SH_SCI_NR_UARTS symbol of type "int"
doesn't get assigned a numerical default value, but an empty string,
leading to a build failure:

   .config:3814:warning: symbol value '' invalid for SERIAL_SH_SCI_NR_UARTS
   ...
   make[3]: *** [silentoldconfig] Error 1

Fix this by explicitly providing a default value of 2, like before.

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Fixes: f6731485a51978ca ("tty: serial: sh-sci: Hide number of ports config question")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

This Linux change may have been applied to various maintained Linux releases and you can find Linux releases including commit 19ac50f.

There is one line of Linux source code added/deleted in this change. Code changes to Linux kernel are as follows.

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

diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index 4e6dfb0..3682fd3 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -766,6 +766,7 @@ config SERIAL_SH_SCI_NR_UARTS
 	default "3" if H8300
 	default "10" if SUPERH
 	default "18" if ARCH_RENESAS
+	default "2"
 
 config SERIAL_SH_SCI_CONSOLE
 	bool "Support for console on SuperH SCI(F)" if EXPERT

The commit for this change in Linux stable tree is 19ac50f (patch).

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