linux-kernel - [PATCH] serial: forbid 8250 on s390

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Date:   Tue, 12 Dec 2017 09:08:35 +0100
From:   Christian Borntraeger <borntraeger@...ibm.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>
Cc:     linux-serial@...r.kernel.org, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Christian Borntraeger <borntraeger@...ibm.com>
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 <alice@...ux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@...ibm.com>
Reviewed-by: Hendrik Brueckner <brueckner@...ux.vnet.ibm.com>
---
 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
 	---help---
 	  This selects whether you want to include the driver for the standard
-- 
2.9.4