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Fixes ttm on platforms like PPC460 where the CPU is in 32-bit mode, but the physical addresses are >32 bits. Extracted from a patch by Hans Verkuil. Tested-by: Julian Margetson <[email protected]> Acked-by: Thomas Hellstrom <[email protected]> Reviewed-by: Christian König <[email protected]> Cc: Thomas Hellstrom <[email protected]> Cc: Julian Margetson <[email protected]> Cc: Hans Verkuil <[email protected]> Signed-off-by: Alex Deucher <[email protected]>