BYTE_REG_BITS_OFF  495 drivers/net/ethernet/via/via-rhine.c #define BYTE_REG_BITS_OFF(x, p)     do { iowrite8(ioread8((p)) & (~(x)), (p)); } while (0)
BYTE_REG_BITS_OFF   43 drivers/net/ethernet/via/via-velocity.h #define BYTE_REG_BITS_OFF(x,p)      do { writeb(readb((p)) & (~(x)),(p));} while (0)