powerpc/mm: Set fault flags earlier
Move out the code that sets FAULT_FLAG_WRITE so the block that check access permissions can be extracted. While at it also set FAULT_FLAG_INSTRUCTION which will be used for protection keys. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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