linux-kernel - [PATCH] Without a bool string present, using "# CONFIG_DEVPORT is not set" in defconfig files would not actually unset devport. This esnured that /dev/port was always on, but there are reasons a user may wish to disable it (smaller kernel, attack surface reduction) if it's not being used. Adding a message here in order to make this user visible.

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Date:   Tue,  3 Jan 2017 06:26:33 -0800
From:   Max Bires <jbires@...gle.com>
To:     gregkh@...uxfoundation.org
Cc:     arnd@...db.de, josh@...htriplett.org, linux-kernel@...r.kernel.org,
        geert@...ux-m68k.org, Max Bires <jbires@...gle.com>
Subject: [PATCH] Without a bool string present, using "# CONFIG_DEVPORT is not set" in defconfig files would not actually unset devport. This esnured that /dev/port was always on, but there are reasons a user may wish to disable it (smaller kernel, attack surface reduction) if it's not being used. Adding a message here in order to make this user visible.

Signed-off-by: Max Bires <jbires@...gle.com>
Acked-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/char/Kconfig | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index fde005e..4ee2a10 100644
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -571,9 +571,12 @@ config TELCLOCK
 	  controlling the behavior of this hardware.
 
 config DEVPORT
-	bool
+	bool "/dev/port character device"
 	depends on ISA || PCI
 	default y
+	help
+	  Say Y here if you want to support the /dev/port device. The /dev/port
+	  device is similar to /dev/mem, but for I/O ports.
 
 source "drivers/s390/char/Kconfig"
 
-- 
2.8.0.rc3.226.g39d4020