sys_gettimeofday
asmlinkage long sys_gettimeofday(struct __kernel_old_timeval __user *tv,
__SC_COMP(__NR_gettimeofday, sys_gettimeofday, compat_sys_gettimeofday)
__SC_COMP(__NR_gettimeofday, sys_gettimeofday, compat_sys_gettimeofday)
if (sys_gettimeofday(&start, &sys_tz) < 0) {
end_ret = sys_gettimeofday(&end, NULL);