X-Git-Url: http://git.rot13.org/?a=blobdiff_plain;f=arch%2Fmips%2Fkernel%2Ftime.c;h=13ff4da598cdfbcff3b2d34677c0e89cd3b55e28;hb=d42510a0f58c2583c37c8e9b7548e3a68545863a;hp=7050b4ffffcd34a992c6c99293cdb18d59fea15e;hpb=d936cfc72032fb4af03d1edd99596d18ea1f081c;p=powerpc.git

diff --git a/arch/mips/kernel/time.c b/arch/mips/kernel/time.c
index 7050b4ffff..13ff4da598 100644
--- a/arch/mips/kernel/time.c
+++ b/arch/mips/kernel/time.c
@@ -65,9 +65,9 @@ static int null_rtc_set_time(unsigned long sec)
 	return 0;
 }
 
-unsigned long (*rtc_get_time)(void) = null_rtc_get_time;
-int (*rtc_set_time)(unsigned long) = null_rtc_set_time;
-int (*rtc_set_mmss)(unsigned long);
+unsigned long (*rtc_mips_get_time)(void) = null_rtc_get_time;
+int (*rtc_mips_set_time)(unsigned long) = null_rtc_set_time;
+int (*rtc_mips_set_mmss)(unsigned long);
 
 
 /* usecs per counter cycle, shifted to left by 32 bits */
@@ -116,8 +116,7 @@ static void c0_timer_ack(void)
 	write_c0_compare(expirelo);
 
 	/* Check to see if we have missed any timer interrupts.  */
-	count = read_c0_count();
-	if ((count - expirelo) < 0x7fffffff) {
+	while (((count = read_c0_count()) - expirelo) < 0x7fffffff) {
 		/* missed_timer_count++; */
 		expirelo = count + cycles_per_jiffy;
 		write_c0_compare(expirelo);
@@ -163,7 +162,7 @@ void do_gettimeofday(struct timeval *tv)
 	unsigned long seq;
 	unsigned long lost;
 	unsigned long usec, sec;
-	unsigned long max_ntp_tick = tick_usec - tickadj;
+	unsigned long max_ntp_tick;
 
 	do {
 		seq = read_seqbegin(&xtime_lock);
@@ -178,12 +177,13 @@ void do_gettimeofday(struct timeval *tv)
 		 * Better to lose some accuracy than have time go backwards..
 		 */
 		if (unlikely(time_adjust < 0)) {
+			max_ntp_tick = (USEC_PER_SEC / HZ) - tickadj;
 			usec = min(usec, max_ntp_tick);
 
 			if (lost)
 				usec += lost * max_ntp_tick;
 		} else if (unlikely(lost))
-			usec += lost * tick_usec;
+			usec += lost * (USEC_PER_SEC / HZ);
 
 		sec = xtime.tv_sec;
 		usec += (xtime.tv_nsec / 1000);
@@ -423,6 +423,8 @@ irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 	unsigned long j;
 	unsigned int count;
 
+	write_seqlock(&xtime_lock);
+
 	count = mips_hpt_read();
 	mips_timer_ack();
 
@@ -437,22 +439,20 @@ irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 
 	/*
 	 * If we have an externally synchronized Linux clock, then update
-	 * CMOS clock accordingly every ~11 minutes. rtc_set_time() has to be
+	 * CMOS clock accordingly every ~11 minutes. rtc_mips_set_time() has to be
 	 * called as close as possible to 500 ms before the new second starts.
 	 */
-	write_seqlock(&xtime_lock);
 	if (ntp_synced() &&
 	    xtime.tv_sec > last_rtc_update + 660 &&
 	    (xtime.tv_nsec / 1000) >= 500000 - ((unsigned) TICK_SIZE) / 2 &&
 	    (xtime.tv_nsec / 1000) <= 500000 + ((unsigned) TICK_SIZE) / 2) {
-		if (rtc_set_mmss(xtime.tv_sec) == 0) {
+		if (rtc_mips_set_mmss(xtime.tv_sec) == 0) {
 			last_rtc_update = xtime.tv_sec;
 		} else {
 			/* do it again in 60 s */
 			last_rtc_update = xtime.tv_sec - 600;
 		}
 	}
-	write_sequnlock(&xtime_lock);
 
 	/*
 	 * If jiffies has overflown in this timer_interrupt, we must
@@ -495,6 +495,8 @@ irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 		}
 	}
 
+	write_sequnlock(&xtime_lock);
+
 	/*
 	 * In UP mode, we call local_timer_interrupt() to do profiling
 	 * and process accouting.
@@ -562,7 +564,7 @@ asmlinkage void ll_local_timer_interrupt(int irq, struct pt_regs *regs)
  *      b) (optional) calibrate and set the mips_hpt_frequency
  *	    (only needed if you intended to use fixed_rate_gettimeoffset
  *	     or use cpu counter as timer interrupt source)
- * 2) setup xtime based on rtc_get_time().
+ * 2) setup xtime based on rtc_mips_get_time().
  * 3) choose a appropriate gettimeoffset routine.
  * 4) calculate a couple of cached variables for later usage
  * 5) board_timer_setup() -
@@ -630,10 +632,10 @@ void __init time_init(void)
 	if (board_time_init)
 		board_time_init();
 
-	if (!rtc_set_mmss)
-		rtc_set_mmss = rtc_set_time;
+	if (!rtc_mips_set_mmss)
+		rtc_mips_set_mmss = rtc_mips_set_time;
 
-	xtime.tv_sec = rtc_get_time();
+	xtime.tv_sec = rtc_mips_get_time();
 	xtime.tv_nsec = 0;
 
 	set_normalized_timespec(&wall_to_monotonic,
@@ -769,8 +771,8 @@ void to_tm(unsigned long tim, struct rtc_time *tm)
 
 EXPORT_SYMBOL(rtc_lock);
 EXPORT_SYMBOL(to_tm);
-EXPORT_SYMBOL(rtc_set_time);
-EXPORT_SYMBOL(rtc_get_time);
+EXPORT_SYMBOL(rtc_mips_set_time);
+EXPORT_SYMBOL(rtc_mips_get_time);
 
 unsigned long long sched_clock(void)
 {