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Subject[PATCH 1/3] drivers: char: mem: Make /dev/mem an optional device
Date
From: Rob Ward <robert.ward114@googlemail.com>

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>
---
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


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