powerpc/8xx: Don't touch ACCESSED when no SWAP.
Only the swap function cares about the ACCESSED bit in the pte. Do not waste cycles updateting ACCESSED when swap is not compiled into the kernel. Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@transmode.se> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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