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powerpc/mm: Move the DSISR_PROTFAULT sanity check
This has a page of comment explaining what's going on right in the middle of do_page_fault() which makes things a bit hard to follow. Move it to a helper instead. Also do the test earlier as there's no point waiting until after we found the VMA. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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Benjamin Herrenschmidt
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Michael Ellerman
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Aug 3, 2017
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