linux-kernel - [PATCH 1/2] Kconfig: Allow disabling of CONFIG

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Message-Id: <1310675693-9204-1-git-send-email-mikew@google.com>
Date:	Thu, 14 Jul 2011 13:34:52 -0700
From:	Mike Waychison <mikew@...gle.com>
To:	Greg Kroah-Hartman <gregkh@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>
Cc:	x86@...nel.org, linux-kernel@...r.kernel.org,
	Mike Waychison <mikew@...gle.com>
Subject: [PATCH 1/2] Kconfig:  Allow disabling of CONFIG_DEVPORT

It would be useful to build kernels with disabled support of /dev/port
for systems where we do not want to allow an administrator to access IO
ports directly.

To do so however, CONFIG_DEVPORT needs to be user-selectable.  Give this
configuration option a name and help description.

Google-Bug-Id: 3177114
Signed-off-by: Mike Waychison <mikew@...gle.com>
---
 drivers/char/Kconfig |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index 49502bc..12503f1 100644
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -593,10 +593,15 @@ config TELCLOCK
 	  controlling the behavior of this hardware.
 
 config DEVPORT
-	bool
+	bool "Support for /dev/port"
 	depends on !M68K
 	depends on ISA || PCI
 	default y
+	help
+	  Enabling this option allows for access to the /dev/port
+	  character device.  This device maps IO ports onto a file
+	  interface, so that users with sufficient privilege can read
+	  and write to IO ports directly.  If unsure, say yes.
 
 source "drivers/s390/char/Kconfig"
 
-- 
1.7.3.1

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