uclinux PIO device driver interrupt handler not execute

Hi,

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Do you know a good way to get time(second/usecond)? I tried to use the do_gettimeofday function call in the interrupt handler but with random timestamp return. Sometime it jump back time as well. If you may know, can you kindly point me to a right direction?

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What 'jump back time' means?

/**
 * do_gettimeofday - Returns the time of day in a timeval
 * @tv:		pointer to the timeval to be set
 *
 * NOTE: Users should be converted to using getnstimeofday()
 */
void do_gettimeofday(struct timeval *tv)
{
	struct timespec now;
	getnstimeofday(&now);
	tv->tv_sec = now.tv_sec;
	tv->tv_usec = now.tv_nsec/1000;
}

'tv_sec' will not increase monotonously ? How does the command 'date' response in your shell ?

Kazu