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Commit e9629165 authored by Ingo Molnar's avatar Ingo Molnar
Browse files

time: ntp: refactor do_adjtimex() some more 



Impact: cleanup, no functionality changed

Further simplify do_adjtimex():

 - introduce the ntp_start_leap_timer() helper function
 - eliminate the goto adj_done complication

Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 80f22571

kernel/time/ntp.c

+36 −25
Original line number Diff line number Diff line
@@ -332,14 +332,33 @@ static void notify_cmos_timer(void) 
static inline void notify_cmos_timer(void) { }

#endif



/*

 * Start the leap seconds timer:

 */

static inline void ntp_start_leap_timer(struct timespec *ts)

{

	long now = ts->tv_sec;



	if (time_status & STA_INS) {

		time_state = TIME_INS;

		now += 86400 - now % 86400;

		hrtimer_start(&leap_timer, ktime_set(now, 0), HRTIMER_MODE_ABS);



		return;

	}



	if (time_status & STA_DEL) {

		time_state = TIME_DEL;

		now += 86400 - (now + 1) % 86400;

		hrtimer_start(&leap_timer, ktime_set(now, 0), HRTIMER_MODE_ABS);

	}

}



/*

 * Propagate a new txc->status value into the NTP state:

 */

static inline void process_adj_status(struct timex *txc, struct timespec *ts)

{

	long now;



	if ((time_status & STA_PLL) && !(txc->status & STA_PLL)) {

		time_state = TIME_OK;

		time_status = STA_UNSYNC;
@@ -358,22 +377,12 @@ static inline void process_adj_status(struct timex *txc, struct timespec *ts) 


	switch (time_state) {

	case TIME_OK:

	start_timer:

		now = ts->tv_sec;

		if (time_status & STA_INS) {

			time_state = TIME_INS;

			now += 86400 - now % 86400;

			hrtimer_start(&leap_timer, ktime_set(now, 0), HRTIMER_MODE_ABS);

		} else if (time_status & STA_DEL) {

			time_state = TIME_DEL;

			now += 86400 - (now + 1) % 86400;

			hrtimer_start(&leap_timer, ktime_set(now, 0), HRTIMER_MODE_ABS);

		}

		ntp_start_leap_timer(ts);

		break;

	case TIME_INS:

	case TIME_DEL:

		time_state = TIME_OK;

		goto start_timer;

		ntp_start_leap_timer(ts);

	case TIME_WAIT:

		if (!(time_status & (STA_INS | STA_DEL)))

			time_state = TIME_OK;
@@ -394,6 +403,7 @@ static inline void process_adjtimex_modes(struct timex *txc, struct timespec *ts 


	if (txc->modes & ADJ_NANO)

		time_status |= STA_NANO;



	if (txc->modes & ADJ_MICRO)

		time_status &= ~STA_NANO;
@@ -405,6 +415,7 @@ static inline void process_adjtimex_modes(struct timex *txc, struct timespec *ts 


	if (txc->modes & ADJ_MAXERROR)

		time_maxerror = txc->maxerror;



	if (txc->modes & ADJ_ESTERROR)

		time_esterror = txc->esterror;
@@ -421,6 +432,7 @@ static inline void process_adjtimex_modes(struct timex *txc, struct timespec *ts 


	if (txc->modes & ADJ_OFFSET)

		ntp_update_offset(txc->offset);



	if (txc->modes & ADJ_TICK)

		tick_usec = txc->tick;
@@ -467,7 +479,6 @@ int do_adjtimex(struct timex *txc) 


	write_seqlock_irq(&xtime_lock);



	/* If there are input parameters, then process them */

	if (txc->modes & ADJ_ADJTIME) {

		long save_adjust = time_adjust;
@@ -477,8 +488,7 @@ int do_adjtimex(struct timex *txc) 
			ntp_update_frequency();

		}

		txc->offset = save_adjust;

		goto adj_done;

	}

	} else {



		/* If there are input parameters, then process them: */

		if (txc->modes)
@@ -488,8 +498,8 @@ int do_adjtimex(struct timex *txc) 
				  NTP_SCALE_SHIFT);

		if (!(time_status & STA_NANO))

			txc->offset /= NSEC_PER_USEC;

	}



adj_done:

	result = time_state;	/* mostly `TIME_OK' */

	if (time_status & (STA_UNSYNC|STA_CLOCKERR))

		result = TIME_ERROR;
@@ -514,6 +524,7 @@ int do_adjtimex(struct timex *txc) 
	txc->calcnt	   = 0;

	txc->errcnt	   = 0;

	txc->stbcnt	   = 0;



	write_sequnlock_irq(&xtime_lock);



	txc->time.tv_sec = ts.tv_sec;