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drivers: char: mem: Make /dev/mem an optional device 

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 <robert.ward114@googlemail.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Rob Ward 2014-12-07 15:40:33 +00:00 committed by Greg Kroah-Hartman
parent 769105aa74
commit 73f0718e74
2 changed files with 12 additions and 1 deletions
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9
drivers/char/Kconfig
View File

@ -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

4
drivers/char/mem.c
View File

@ -715,7 +715,7 @@ 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,
@ -785,7 +785,9 @@ 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