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| author | Rob Ward <robert.ward114@googlemail.com> | 2014-12-07 16:40:33 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-01-12 14:04:11 +0100 |
| commit | 73f0718e74e25ac7381450a7a21257b8f26f43f0 (patch) | |
| tree | 573cc25a7fa4ca6f31473f58a44cf1eebead3646 /drivers | |
| parent | misc: ioc4: simplify wave period measurement in clock_calibrate (diff) | |
| download | linux-73f0718e74e25ac7381450a7a21257b8f26f43f0.tar.xz linux-73f0718e74e25ac7381450a7a21257b8f26f43f0.zip | |
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/char/Kconfig | 9 | ||||
| -rw-r--r-- | drivers/char/mem.c | 4 |
2 files changed, 12 insertions, 1 deletions
diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig index efefd12a0f7b..a4af8221751e 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 4c58333b4257..7d6778437be0 100644 --- a/drivers/char/mem.c +++ b/drivers/char/mem.c @@ -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 |