USEC_PER_SEC       27 include/linux/time64.h #define USEC_PER_SEC	1000000L
USEC_PER_SEC        9 tools/include/linux/time64.h #define USEC_PER_SEC	1000000L
USEC_PER_SEC       31 tools/testing/selftests/timers/adjtick.c #define USEC_PER_SEC		1000000
USEC_PER_SEC       38 tools/testing/selftests/timers/valid-adjtimex.c #define USEC_PER_SEC 1000000LL