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authorBernd Schmidt <bernds_cb1@t-online.de>2009-09-21 17:03:57 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-09-22 07:17:43 -0700
commiteb8cdec4a984fde123a91250dcc9e0bddf5eafdc (patch)
tree9f97b5949e6e63ae947363149b62ed224dad5ab9 /arch/h8300
parent02e87d1a934c70e3599eb7a29db783806d329e17 (diff)
nommu: add support for Memory Protection Units (MPU)
Some architectures (like the Blackfin arch) implement some of the "simpler" features that one would expect out of a MMU such as memory protection. In our case, we actually get read/write/exec protection down to the page boundary so processes can't stomp on each other let alone the kernel. There is a performance decrease (which depends greatly on the workload) however as the hardware/software interaction was not optimized at design time. Signed-off-by: Bernd Schmidt <bernds_cb1@t-online.de> Signed-off-by: Bryan Wu <cooloney@kernel.org> Signed-off-by: Mike Frysinger <vapier@gentoo.org> Acked-by: David Howells <dhowells@redhat.com> Acked-by: Greg Ungerer <gerg@snapgear.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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