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The current low level hash code on LPAR configurations clears _PAGE_COHERENT (M) when either _PAGE_GUARDED (G) or _PAGE_NO_CACHE (I) is set. This conflicts with _PAGE_SAO which has M, I and W bits sets at once (normally invalid combo) to indicate the new SAO attribute. This changes the code to allow that case. Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>