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SubjectRe: [PATCH 0/3] /dev/mem as optional device + associated tidy up
On Sunday 07 December 2014 15:40:32 wrote:
> 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
> file.
> 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.

Acked-by: Arnd Bergmann <>

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