VIRT_PAGE_BASE 12 sound/soc/codecs/tscs454.h #define VIRT_ADDR(page, address) (VIRT_PAGE_BASE(page) + address) VIRT_PAGE_BASE 13 sound/soc/codecs/tscs454.h #define ADDR(page, virt_address) (virt_address - VIRT_PAGE_BASE(page))