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)