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>
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@ -6,6 +6,15 @@ menu "Character devices"
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source "drivers/tty/Kconfig"
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source "drivers/tty/Kconfig"
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config DEVMEM
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bool "/dev/mem virtual device support"
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default y
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help
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Say Y here if you want to support the /dev/mem device.
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The /dev/mem device is used to access areas of physical
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memory.
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When in doubt, say "Y".
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config DEVKMEM
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config DEVKMEM
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bool "/dev/kmem virtual device support"
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bool "/dev/kmem virtual device support"
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default y
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default y
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@ -715,7 +715,7 @@ static int open_port(struct inode *inode, struct file *filp)
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#define open_mem open_port
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#define open_mem open_port
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#define open_kmem open_mem
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#define open_kmem open_mem
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static const struct file_operations mem_fops = {
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static const struct file_operations __maybe_unused mem_fops = {
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.llseek = memory_lseek,
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.llseek = memory_lseek,
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.read = read_mem,
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.read = read_mem,
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.write = write_mem,
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.write = write_mem,
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@ -785,7 +785,9 @@ static const struct memdev {
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const struct file_operations *fops;
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const struct file_operations *fops;
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struct backing_dev_info *dev_info;
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struct backing_dev_info *dev_info;
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} devlist[] = {
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} devlist[] = {
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#ifdef CONFIG_DEVMEM
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[1] = { "mem", 0, &mem_fops, &directly_mappable_cdev_bdi },
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[1] = { "mem", 0, &mem_fops, &directly_mappable_cdev_bdi },
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#endif
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#ifdef CONFIG_DEVKMEM
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#ifdef CONFIG_DEVKMEM
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[2] = { "kmem", 0, &kmem_fops, &directly_mappable_cdev_bdi },
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[2] = { "kmem", 0, &kmem_fops, &directly_mappable_cdev_bdi },
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#endif
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#endif
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