From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753147AbaLGPmj (ORCPT ); Sun, 7 Dec 2014 10:42:39 -0500 Received: from mail-wi0-f170.google.com ([209.85.212.170]:44167 "EHLO mail-wi0-f170.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751519AbaLGPlu (ORCPT ); Sun, 7 Dec 2014 10:41:50 -0500 From: robert.ward114@googlemail.com To: arnd@arndb.de, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org Cc: Rob Ward Subject: [PATCH 1/3] drivers: char: mem: Make /dev/mem an optional device Date: Sun, 7 Dec 2014 15:40:33 +0000 Message-Id: <1417966835-14012-2-git-send-email-robert.ward114@googlemail.com> X-Mailer: git-send-email 2.2.0 In-Reply-To: <1417966835-14012-1-git-send-email-robert.ward114@googlemail.com> References: <1417966835-14012-1-git-send-email-robert.ward114@googlemail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Rob Ward Adds Kconfig option CONFIG_DEVMEM that allows the /dev/mem device to be disabled. Option defaults to /dev/mem enabled. Signed-off-by: Rob Ward --- drivers/char/Kconfig | 9 +++++++++ drivers/char/mem.c | 4 +++- 2 files changed, 12 insertions(+), 1 deletion(-) diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig index efefd12..a4af822 100644 --- a/drivers/char/Kconfig +++ b/drivers/char/Kconfig @@ -6,6 +6,15 @@ menu "Character devices" source "drivers/tty/Kconfig" +config DEVMEM + bool "/dev/mem virtual device support" + default y + help + Say Y here if you want to support the /dev/mem device. + The /dev/mem device is used to access areas of physical + memory. + When in doubt, say "Y". + config DEVKMEM bool "/dev/kmem virtual device support" default y diff --git a/drivers/char/mem.c b/drivers/char/mem.c index 524b707..b2ca476 100644 --- a/drivers/char/mem.c +++ b/drivers/char/mem.c @@ -712,7 +712,7 @@ static int open_port(struct inode *inode, struct file *filp) #define open_mem open_port #define open_kmem open_mem -static const struct file_operations mem_fops = { +static const struct file_operations __maybe_unused mem_fops = { .llseek = memory_lseek, .read = read_mem, .write = write_mem, @@ -782,7 +782,9 @@ static const struct memdev { const struct file_operations *fops; struct backing_dev_info *dev_info; } devlist[] = { +#ifdef CONFIG_DEVMEM [1] = { "mem", 0, &mem_fops, &directly_mappable_cdev_bdi }, +#endif #ifdef CONFIG_DEVKMEM [2] = { "kmem", 0, &kmem_fops, &directly_mappable_cdev_bdi }, #endif -- 2.0.2