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Date:   Tue, 12 Dec 2017 09:08:35 +0100
From:   Christian Borntraeger <>
To:     Greg Kroah-Hartman <>,
        Jiri Slaby <>
        Christian Borntraeger <>
Subject: [PATCH] serial: forbid 8250 on s390

Using "make kvmconfig" results in a potentially unusable linux image
on s390.  The reason is that both the (default on s390) sclp consoles
as well as the 8250 console register a ttyS<x> as console. Since there
will be no 8250 on s390 let's fence 8250. This will ensure that there
is always a working sclp console.

Reported-by: Alice Frosi <>
Signed-off-by: Christian Borntraeger <>
Reviewed-by: Hendrik Brueckner <>
 drivers/tty/serial/8250/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/tty/serial/8250/Kconfig b/drivers/tty/serial/8250/Kconfig
index a5c0ef1..16b1496 100644
--- a/drivers/tty/serial/8250/Kconfig
+++ b/drivers/tty/serial/8250/Kconfig
@@ -5,6 +5,7 @@
 config SERIAL_8250
 	tristate "8250/16550 and compatible serial support"
+	depends on !S390
 	select SERIAL_CORE
 	  This selects whether you want to include the driver for the standard

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