__elem->channel_type.report_format = kIOReportFormatHistogram; \
__elem->channel_type.reserved = 0; \
__elem->channel_type.categories = (cats); \
__elem->channel_type.nelements = (nbuckets); \
__elem->channel_type.element_idx = __no; \
__elem->timestamp = 0; \
__elem->channel_type.report_format = kIOReportFormatHistogram; \
__elem->channel_type.reserved = 0; \
__elem->channel_type.categories = (cats); \
__elem->channel_type.nelements = (nbuckets); \
__elem->channel_type.element_idx = __no; \
__elem->timestamp = 0; \