tree 03239e77dbc43f627ce112963736c8b4c53117e6
parent e5093ff05d36c64e8f36a9ddb26358256dc133ea
author Dave Kleikamp <shaggy@linux.vnet.ibm.com> 1215440931 +1000
committer Benjamin Herrenschmidt <benh@kernel.crashing.org> 1215585045 +1000

mm: Allow architectures to define additional protection bits

This patch allows architectures to define functions to deal with
additional protections bits for mmap() and mprotect().

arch_calc_vm_prot_bits() maps additonal protection bits to vm_flags
arch_vm_get_page_prot() maps additional vm_flags to the vma's vm_page_prot
arch_validate_prot() checks for valid values of the protection bits

Note: vm_get_page_prot() is now pretty ugly, but the generated code
should be identical for architectures that don't define additional
protection bits.

Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com>
Acked-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>