TEST_BIT
#define TEST_BIT(ary, b) ((1 << ((b) & 7)) & (ary)[(b) >> 3])
#define TEST_BIT(name) test_bit(ETHTOOL_LINK_MODE_ ## name ## _BIT, \
#undef TEST_BIT
#define TEST_BIT(name) test_bit(ETHTOOL_LINK_MODE_ ## name ## _BIT, \
#undef TEST_BIT
#define TEST_BIT(t) (1U << (t))