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The union approach will get the endianness wrong sometimes if the kernel's pointer size is 32 bits resulting in EFAULTs when trying to copy to/from user. Signed-off-by: Leon Romanovsky <leon@kernel.org> Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>