sys_clock_gettime
asmlinkage long sys_clock_gettime(clockid_t which_clock,
__SC_3264(__NR_clock_gettime, sys_clock_gettime32, sys_clock_gettime)
__SYSCALL(__NR_clock_gettime64, sys_clock_gettime)
static int sys_clock_gettime(clockid_t clockid, struct timespec *tp);
ret = sys_clock_gettime(CLOCK_REALTIME, &tp);
return __sysret(sys_clock_gettime(clockid, tp));
__SC_3264(__NR_clock_gettime, sys_clock_gettime32, sys_clock_gettime)
__SYSCALL(__NR_clock_gettime64, sys_clock_gettime)
if (sys_clock_gettime(clock, &start) < 0) {
end_ret = sys_clock_gettime(clock, &end);