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Subject[PATCH 0/3] /dev/mem as optional device + associated tidy up
From: Rob Ward <>

Makes the /dev/mem device optional using the CONFIG_DEVMEM option.

This brings /dev/mem in line with /dev/kmem so it can de disabled.
Disabling /dev/mem is preferable on devices that do not require
direct access to memory in order to improve security. This is especially
true on platforms where no restiction is placed on the areas of memory
that can be accessed(for example mips) without custom modifcations to
the kernel source.

The implementation of this functionality declares the mem_fops structure
as __maybe_unused to eliminate the need for #ifdefs throughout the

Follow up changes are present to change CONFIG_DEVKMEM and CONFIG_DEVPORT
to use __maybe_unused. This simplifies the code and make the
implementations consistent.

Rob Ward (3):
drivers: char: mem: Make /dev/mem an optional device
drivers: char: mem: Simplify DEVKMEM configuration
drivers: char: mem: Simplify DEVPORT configuration

drivers/char/Kconfig | 9 +++++++++
drivers/char/mem.c | 18 +++++-------------
2 files changed, 14 insertions(+), 13 deletions(-)


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