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Provide a very simple ARCH_HAS_DEBUG_VIRTUAL implementation. For now errors are only reported for the following cases: - Trying to translate a vmalloc or module address to a physical address - Translating a supposed to be ZONE_DMA virtual address into a physical address, and the resulting physical address is larger than two GiB Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>