[RFC] Add dev.mem.restricted sysctl

[Bernhard Walle]

While the first patch is only a small cleanup, the second patch adds a
new sysctl dev.mem.restricted. See that patch for a description why I
think that sysctl is needed.

Please give feedback and review. Thanks!


Signed-off-by: Bernhard Walle <bwalle@xxxxxxx>


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