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