FIELD_OFFSET 24 drivers/staging/rtl8712/basic_types.h #define FIELD_OFFSET(s, field) ((addr_t)&((s *)(0))->field) FIELD_OFFSET 18 drivers/staging/rtl8723bs/include/basic_types.h #define FIELD_OFFSET(s, field) ((__kernel_ssize_t)&((s*)(0))->field)