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H A Dpkeys.hdiff 87bbabbed8a77092135f6442b8d5619906a81255 Fri Jan 19 02:50:34 CET 2018 Ram Pai <linuxram@us.ibm.com> powerpc: implementation for arch_override_mprotect_pkey()

arch independent code calls arch_override_mprotect_pkey()
to return a pkey that best matches the requested protection.

This patch provides the implementation.

Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>