X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=kernel%2Ftime%2Fntp.c;h=5fd9b946977038cbdc192dc5a11146696ad53947;hb=bed04a4413376265746053be2a9cfbfc80c98ec9;hp=cd91237dbfe3c160867e60a12f4251b2bf4679fa;hpb=2e85622042cb5fd56a606e884651ffde52f21028;p=linux-2.6

diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index cd91237dbf..5fd9b94697 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -42,16 +42,13 @@ long time_esterror = NTP_PHASE_LIMIT;	/* estimated error (us)		*/
 long time_freq;				/* frequency offset (scaled ppm)*/
 static long time_reftime;		/* time at last adjustment (s)	*/
 long time_adjust;
-
-#define CLOCK_TICK_OVERFLOW	(LATCH * HZ - CLOCK_TICK_RATE)
-#define CLOCK_TICK_ADJUST	(((s64)CLOCK_TICK_OVERFLOW * NSEC_PER_SEC) / \
-					(s64)CLOCK_TICK_RATE)
+static long ntp_tick_adj;
 
 static void ntp_update_frequency(void)
 {
 	u64 second_length = (u64)(tick_usec * NSEC_PER_USEC * USER_HZ)
 				<< TICK_LENGTH_SHIFT;
-	second_length += (s64)CLOCK_TICK_ADJUST << TICK_LENGTH_SHIFT;
+	second_length += (s64)ntp_tick_adj << TICK_LENGTH_SHIFT;
 	second_length += (s64)time_freq << (TICK_LENGTH_SHIFT - SHIFT_NSEC);
 
 	tick_length_base = second_length;
@@ -205,7 +202,7 @@ static void sync_cmos_clock(unsigned long dummy)
 		return;
 
 	getnstimeofday(&now);
-	if (abs(xtime.tv_nsec - (NSEC_PER_SEC / 2)) <= tick_nsec / 2)
+	if (abs(now.tv_nsec - (NSEC_PER_SEC / 2)) <= tick_nsec / 2)
 		fail = update_persistent_clock(now);
 
 	next.tv_nsec = (NSEC_PER_SEC / 2) - now.tv_nsec;
@@ -226,7 +223,7 @@ static void sync_cmos_clock(unsigned long dummy)
 
 static void notify_cmos_timer(void)
 {
-	if (no_sync_cmos_clock)
+	if (!no_sync_cmos_clock)
 		mod_timer(&sync_cmos_timer, jiffies + 1);
 }
 
@@ -249,10 +246,12 @@ int do_adjtimex(struct timex *txc)
 
 	/* Now we validate the data before disabling interrupts */
 
-	if ((txc->modes & ADJ_OFFSET_SINGLESHOT) == ADJ_OFFSET_SINGLESHOT)
+	if ((txc->modes & ADJ_OFFSET_SINGLESHOT) == ADJ_OFFSET_SINGLESHOT) {
 	  /* singleshot must not be used with any other mode bits */
-		if (txc->modes != ADJ_OFFSET_SINGLESHOT)
+		if (txc->modes != ADJ_OFFSET_SINGLESHOT &&
+					txc->modes != ADJ_OFFSET_SS_READ)
 			return -EINVAL;
+	}
 
 	if (txc->modes != ADJ_OFFSET_SINGLESHOT && (txc->modes & ADJ_OFFSET))
 	  /* adjustment Offset limited to +- .512 seconds */
@@ -344,14 +343,16 @@ int do_adjtimex(struct timex *txc)
 		    freq_adj = shift_right(freq_adj, time_constant * 2 +
 					   (SHIFT_PLL + 2) * 2 - SHIFT_NSEC);
 		    if (mtemp >= MINSEC && (time_status & STA_FLL || mtemp > MAXSEC)) {
+			u64 utemp64;
 			temp64 = time_offset << (SHIFT_NSEC - SHIFT_FLL);
 			if (time_offset < 0) {
-			    temp64 = -temp64;
-			    do_div(temp64, mtemp);
-			    freq_adj -= temp64;
+			    utemp64 = -temp64;
+			    do_div(utemp64, mtemp);
+			    freq_adj -= utemp64;
 			} else {
-			    do_div(temp64, mtemp);
-			    freq_adj += temp64;
+			    utemp64 = temp64;
+			    do_div(utemp64, mtemp);
+			    freq_adj += utemp64;
 			}
 		    }
 		    freq_adj += time_freq;
@@ -372,7 +373,8 @@ int do_adjtimex(struct timex *txc)
 leave:	if ((time_status & (STA_UNSYNC|STA_CLOCKERR)) != 0)
 		result = TIME_ERROR;
 
-	if ((txc->modes & ADJ_OFFSET_SINGLESHOT) == ADJ_OFFSET_SINGLESHOT)
+	if ((txc->modes == ADJ_OFFSET_SINGLESHOT) ||
+			(txc->modes == ADJ_OFFSET_SS_READ))
 		txc->offset = save_adjust;
 	else
 		txc->offset = ((long)shift_right(time_offset, SHIFT_UPDATE)) *
@@ -401,3 +403,11 @@ leave:	if ((time_status & (STA_UNSYNC|STA_CLOCKERR)) != 0)
 	notify_cmos_timer();
 	return(result);
 }
+
+static int __init ntp_tick_adj_setup(char *str)
+{
+	ntp_tick_adj = simple_strtol(str, NULL, 0);
+	return 1;
+}
+
+__setup("ntp_tick_adj=", ntp_tick_adj_setup);