Re: [patch] fix wrong uptime on non-i386 platforms

george anzinger (george@mvista.com)
Sat, 21 Jun 2003 04:50:24 -0700

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Tim Schmielau wrote:
> On Fri, 20 Jun 2003, george anzinger wrote:
>
>
>>Tim Schmielau wrote:
>>
>>>Here are most of the missing wall_to_monotonic initializations that the
>>>non-i386 architectures still need to pick up.
>>>This should fix the reported uptime inconsistencies.
>>>
>>>Disclaimer: completely untested, since I don't have (most of) the hardware.
>>>
>
> [...]
>
>>>--- linux-2.5.72/arch/parisc/kernel/time.c Fri Jun 20 23:25:45 2003
>>>+++ linux-2.5.72-ufix/arch/parisc/kernel/time.c Fri Jun 20 23:37:10 2003
>>>@@ -242,7 +242,9 @@
>>> if(pdc_tod_read(&tod_data) == 0) {
>>> write_seqlock_irq(&xtime_lock);
>>> xtime.tv_sec = tod_data.tod_sec;
>>>+ wall_to_monotonic.tv_sec = -xtime.tv_sec;
>>> xtime.tv_nsec = tod_data.tod_usec * 1000;
>>>+ wall_to_monotonic.tv_nsec = -xtime.tv_nsec;
>>> write_sequnlock_irq(&xtime_lock);
>>> } else {
>>> printk(KERN_ERR "Error reading tod clock\n");
>>
>>This one should normalize wall_to_monotonic so that nsec >= 0 and <
>>NSEC_PER_SEC.
>
>
> Valid point. Shouldn't i386 (that I blindly copied) also normalize, then?

Uh, I think I missed the initial set up. If tv_nsec is not changed it
is not needed.
>
> This time I also added the missing bits to do_settimeofday() for
> architectures that don't yet know about wall_to_monotonic.

Looks like you missed the normalize on the s390 initial set up.
Otherwise it looks good.

-g

> Disclaimer: previous disclaimer still applies
>
> Tim
>
> --- linux-2.5.72/arch/i386/kernel/time.c Sat Jun 21 08:58:54 2003
> +++ linux-2.5.72-ufix/arch/i386/kernel/time.c Sat Jun 21 09:11:36 2003
> @@ -306,10 +306,13 @@
> {
>
> xtime.tv_sec = get_cmos_time();
> - wall_to_monotonic.tv_sec = -xtime.tv_sec;
> xtime.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ);
> - wall_to_monotonic.tv_nsec = -xtime.tv_nsec;
>
> + wall_to_monotonic.tv_sec = -xtime.tv_sec;
> + if (xtime.tv_nsec != 0) {
> + wall_to_monotonic.tv_nsec = NSEC_PER_SEC - xtime.tv_nsec;
> + wall_to_monotonic.tv_sec--;
> + }
>
> timer = select_timer();
> time_init_hook();
>
> --- linux-2.5.72/arch/alpha/kernel/time.c Sat Jun 21 08:56:38 2003
> +++ linux-2.5.72-ufix/arch/alpha/kernel/time.c Sat Jun 21 09:55:11 2003
> @@ -371,6 +371,8 @@
> xtime.tv_sec = mktime(year, mon, day, hour, min, sec);
> xtime.tv_nsec = 0;
>
> + wall_to_monotonic.tv_sec = -xtime.tv_sec;
> +
> if (HZ > (1<<16)) {
> extern void __you_loose (void);
> __you_loose();
> @@ -478,6 +480,18 @@
> nsec += NSEC_PER_SEC;
> sec -= 1;
> }
> +
> + wall_to_monotonic.tv_sec += xtime.tv_sec - tv->tv_sec;
> + wall_to_monotonic.tv_nsec += xtime.tv_nsec - tv->tv_nsec;
> +
> + if (wall_to_monotonic.tv_nsec > NSEC_PER_SEC) {
> + wall_to_monotonic.tv_nsec -= NSEC_PER_SEC;
> + wall_to_monotonic.tv_sec++;
> + }
> + if (wall_to_monotonic.tv_nsec < 0) {
> + wall_to_monotonic.tv_nsec += NSEC_PER_SEC;
> + wall_to_monotonic.tv_sec--;
> + }
>
> xtime.tv_sec = sec;
> xtime.tv_nsec = nsec;
>
> --- linux-2.5.72/arch/m68k/kernel/time.c Sat Jun 21 08:56:38 2003
> +++ linux-2.5.72-ufix/arch/m68k/kernel/time.c Sat Jun 21 09:22:31 2003
> @@ -102,6 +102,8 @@
> xtime.tv_sec = mktime(time.tm_year, time.tm_mon, time.tm_mday,
> time.tm_hour, time.tm_min, time.tm_sec);
> xtime.tv_nsec = 0;
> +
> + wall_to_monotonic.tv_sec = -xtime.tv_sec;
> }
>
> mach_sched_init(timer_interrupt);
> @@ -159,6 +161,18 @@
> tv->tv_nsec += NSEC_PER_SEC;
> tv->tv_sec--;
> }
> +
> + wall_to_monotonic.tv_sec += xtime.tv_sec - tv->tv_sec;
> + wall_to_monotonic.tv_nsec += xtime.tv_nsec - tv->tv_nsec;
> +
> + if (wall_to_monotonic.tv_nsec > NSEC_PER_SEC) {
> + wall_to_monotonic.tv_nsec -= NSEC_PER_SEC;
> + wall_to_monotonic.tv_sec++;
> + }
> + if (wall_to_monotonic.tv_nsec < 0) {
> + wall_to_monotonic.tv_nsec += NSEC_PER_SEC;
> + wall_to_monotonic.tv_sec--;
> + }
>
> xtime.tv_sec = tv->tv_sec;
> xtime.tv_nsec = tv->tv_nsec;
>
> --- linux-2.5.72/arch/m68knommu/kernel/time.c Sat Jun 14 21:18:24 2003
> +++ linux-2.5.72-ufix/arch/m68knommu/kernel/time.c Sat Jun 21 09:27:48 2003
> @@ -131,6 +131,8 @@
> xtime.tv_sec = mktime(year, mon, day, hour, min, sec);
> xtime.tv_nsec = 0;
>
> + wall_to_monotonic.tv_sec = -xtime.tv_sec;
> +
> mach_sched_init(timer_interrupt);
> }
>
> @@ -178,6 +180,18 @@
> tv->tv_usec += 1000000;
> tv->tv_sec--;
> }
> +
> + wall_to_monotonic.tv_sec += xtime.tv_sec - tv->tv_sec;
> + wall_to_monotonic.tv_nsec += xtime.tv_nsec - tv->tv_nsec;
> +
> + if (wall_to_monotonic.tv_nsec > NSEC_PER_SEC) {
> + wall_to_monotonic.tv_nsec -= NSEC_PER_SEC;
> + wall_to_monotonic.tv_sec++;
> + }
> + if (wall_to_monotonic.tv_nsec < 0) {
> + wall_to_monotonic.tv_nsec += NSEC_PER_SEC;
> + wall_to_monotonic.tv_sec--;
> + }
>
> xtime.tv_sec = tv->tv_sec;
> xtime.tv_nsec = (tv->tv_usec * 1000);
>
> --- linux-2.5.72/arch/parisc/kernel/time.c Sat Jun 21 08:56:38 2003
> +++ linux-2.5.72-ufix/arch/parisc/kernel/time.c Sat Jun 21 09:52:21 2003
> @@ -210,6 +210,18 @@
> tv->tv_sec--;
> }
>
> + wall_to_monotonic.tv_sec += xtime.tv_sec - tv->tv_sec;
> + wall_to_monotonic.tv_nsec += xtime.tv_nsec - tv->tv_nsec;
> +
> + if (wall_to_monotonic.tv_nsec > NSEC_PER_SEC) {
> + wall_to_monotonic.tv_nsec -= NSEC_PER_SEC;
> + wall_to_monotonic.tv_sec++;
> + }
> + if (wall_to_monotonic.tv_nsec < 0) {
> + wall_to_monotonic.tv_nsec += NSEC_PER_SEC;
> + wall_to_monotonic.tv_sec--;
> + }
> +
> xtime.tv_sec = tv->tv_sec;
> xtime.tv_nsec = tv->tv_nsec;
> time_adjust = 0; /* stop active adjtime() */
> @@ -241,8 +253,16 @@
>
> if(pdc_tod_read(&tod_data) == 0) {
> write_seqlock_irq(&xtime_lock);
> +
> xtime.tv_sec = tod_data.tod_sec;
> xtime.tv_nsec = tod_data.tod_usec * 1000;
> +
> + wall_to_monotonic.tv_sec = -xtime.tv_sec;
> + if (xtime.tv_nsec != 0) {
> + wall_to_monotonic.tv_nsec = NSEC_PER_SEC-xtime.tv_nsec;
> + wall_to_monotonic.tv_sec--;
> + }
> +
> write_sequnlock_irq(&xtime_lock);
> } else {
> printk(KERN_ERR "Error reading tod clock\n");
>
> --- linux-2.5.72/arch/ppc/kernel/time.c Sat Jun 21 08:56:38 2003
> +++ linux-2.5.72-ufix/arch/ppc/kernel/time.c Sat Jun 21 09:40:20 2003
> @@ -276,6 +276,16 @@
> }
> xtime.tv_nsec = new_nsec;
> xtime.tv_sec = new_sec;
> + wall_to_monotonic.tv_sec += xtime.tv_sec - new_sec;
> + wall_to_monotonic.tv_nsec += xtime.tv_nsec - new_nsec;
> + if (wall_to_monotonic.tv_nsec > NSEC_PER_SEC) {
> + wall_to_monotonic.tv_nsec -= NSEC_PER_SEC;
> + wall_to_monotonic.tv_sec++;
> + }
> + if (wall_to_monotonic.tv_nsec < 0) {
> + wall_to_monotonic.tv_nsec += NSEC_PER_SEC;
> + wall_to_monotonic.tv_sec--;
> + }
>
> /* In case of a large backwards jump in time with NTP, we want the
> * clock to be updated as soon as the PLL is again in lock.
> @@ -333,6 +343,7 @@
> printk("Warning: real time clock seems stuck!\n");
> xtime.tv_sec = sec;
> xtime.tv_nsec = 0;
> + wall_to_monotonic.tv_sec = -xtime.tv_sec;
> /* No update now, we just read the time from the RTC ! */
> last_rtc_update = xtime.tv_sec;
> }
>
> --- linux-2.5.72/arch/ppc64/kernel/time.c Sat Jun 21 08:56:38 2003
> +++ linux-2.5.72-ufix/arch/ppc64/kernel/time.c Sat Jun 21 09:41:44 2003
> @@ -372,6 +372,16 @@
> }
> xtime.tv_nsec = new_nsec;
> xtime.tv_sec = new_sec;
> + wall_to_monotonic.tv_sec += xtime.tv_sec - new_sec;
> + wall_to_monotonic.tv_nsec += xtime.tv_nsec - new_nsec;
> + if (wall_to_monotonic.tv_nsec > NSEC_PER_SEC) {
> + wall_to_monotonic.tv_nsec -= NSEC_PER_SEC;
> + wall_to_monotonic.tv_sec++;
> + }
> + if (wall_to_monotonic.tv_nsec < 0) {
> + wall_to_monotonic.tv_nsec += NSEC_PER_SEC;
> + wall_to_monotonic.tv_sec--;
> + }
>
> /* In case of a large backwards jump in time with NTP, we want the
> * clock to be updated as soon as the PLL is again in lock.
> @@ -468,6 +478,7 @@
> write_seqlock_irqsave(&xtime_lock, flags);
> xtime.tv_sec = mktime(tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
> tm.tm_hour, tm.tm_min, tm.tm_sec);
> + wall_to_monotonic.tv_sec = -xtime.tv_sec;
> tb_last_stamp = get_tb();
> do_gtod.tb_orig_stamp = tb_last_stamp;
> do_gtod.varp = &do_gtod.vars[0];
>
>
> --- linux-2.5.72/arch/sh/kernel/time.c Sat Jun 21 08:56:38 2003
> +++ linux-2.5.72-ufix/arch/sh/kernel/time.c Sat Jun 21 09:44:26 2003
> @@ -171,6 +171,18 @@
> tv->tv_sec--;
> }
>
> + wall_to_monotonic.tv_sec += xtime.tv_sec - tv->tv_sec;
> + wall_to_monotonic.tv_nsec += xtime.tv_nsec - tv->tv_nsec;
> +
> + if (wall_to_monotonic.tv_nsec > NSEC_PER_SEC) {
> + wall_to_monotonic.tv_nsec -= NSEC_PER_SEC;
> + wall_to_monotonic.tv_sec++;
> + }
> + if (wall_to_monotonic.tv_nsec < 0) {
> + wall_to_monotonic.tv_nsec += NSEC_PER_SEC;
> + wall_to_monotonic.tv_sec--;
> + }
> +
> xtime = *tv;
> time_adjust = 0; /* stop active adjtime() */
> time_status |= STA_UNSYNC;
> @@ -367,6 +379,11 @@
> #endif
>
> rtc_gettimeofday(&xtime);
> + wall_to_monotonic.tv_sec = -xtime.tv_sec;
> + if (xtime.tv_nsec != 0) {
> + wall_to_monotonic.tv_nsec = NSEC_PER_SEC - xtime.tv_nsec;
> + wall_to_monotonic.tv_sec--;
> + }
>
> setup_irq(TIMER_IRQ, &irq0);
>
>
> --- linux-2.5.72/arch/sparc/kernel/time.c Sat Jun 21 08:56:38 2003
> +++ linux-2.5.72-ufix/arch/sparc/kernel/time.c Sat Jun 21 09:46:06 2003
> @@ -408,9 +408,12 @@
> mon = MSTK_REG_MONTH(mregs);
> year = MSTK_CVT_YEAR( MSTK_REG_YEAR(mregs) );
> xtime.tv_sec = mktime(year, mon, day, hour, min, sec);
> - wall_to_monotonic.tv_sec = -xtime.tv_sec + INITIAL_JIFFIES / HZ;
> xtime.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ);
> - wall_to_monotonic.tv_nsec = 0;
> + wall_to_monotonic.tv_sec = -xtime.tv_sec;
> + if (xtime.tv_nsec != 0) {
> + wall_to_monotonic.tv_nsec = NSEC_PER_SEC - xtime.tv_nsec;
> + wall_to_monotonic.tv_sec--;
> + }
> mregs->creg &= ~MSTK_CREG_READ;
> spin_unlock_irq(&mostek_lock);
> #ifdef CONFIG_SUN4
>
> --- linux-2.5.72/arch/sparc64/kernel/time.c Sat Jun 21 08:56:38 2003
> +++ linux-2.5.72-ufix/arch/sparc64/kernel/time.c Sat Jun 21 09:46:35 2003
> @@ -703,9 +703,12 @@
> }
>
> xtime.tv_sec = mktime(year, mon, day, hour, min, sec);
> - wall_to_monotonic.tv_sec = -xtime.tv_sec + INITIAL_JIFFIES / HZ;
> xtime.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ);
> - wall_to_monotonic.tv_nsec = 0;
> + wall_to_monotonic.tv_sec = -xtime.tv_sec;
> + if (xtime.tv_nsec != 0) {
> + wall_to_monotonic.tv_nsec = NSEC_PER_SEC - xtime.tv_nsec;
> + wall_to_monotonic.tv_sec--;
> + }
>
> if (mregs) {
> tmp = mostek_read(mregs + MOSTEK_CREG);
>
> --- linux-2.5.72/arch/x86_64/kernel/time.c Sat Jun 21 08:56:38 2003
> +++ linux-2.5.72-ufix/arch/x86_64/kernel/time.c Sat Jun 21 09:48:14 2003
> @@ -137,6 +137,18 @@
> tv->tv_sec--;
> }
>
> + wall_to_monotonic.tv_sec += xtime.tv_sec - tv->tv_sec;
> + wall_to_monotonic.tv_nsec += xtime.tv_nsec - tv->tv_nsec;
> +
> + if (wall_to_monotonic.tv_nsec > NSEC_PER_SEC) {
> + wall_to_monotonic.tv_nsec -= NSEC_PER_SEC;
> + wall_to_monotonic.tv_sec++;
> + }
> + if (wall_to_monotonic.tv_nsec < 0) {
> + wall_to_monotonic.tv_nsec += NSEC_PER_SEC;
> + wall_to_monotonic.tv_sec--;
> + }
> +
> xtime.tv_sec = tv->tv_sec;
> xtime.tv_nsec = tv->tv_nsec;
>
> @@ -543,6 +555,8 @@
>
> xtime.tv_sec = get_cmos_time();
> xtime.tv_nsec = 0;
> +
> + wall_to_monotonic.tv_sec = -xtime.tv_sec;
>
> if (!hpet_init()) {
> vxtime_hz = (1000000000000000L + hpet_period / 2) /
>
> --- linux-2.5.72/arch/s390/kernel/time.c Sat Jun 21 08:56:38 2003
> +++ linux-2.5.72-ufix/arch/s390/kernel/time.c Sat Jun 21 10:01:03 2003
> @@ -121,6 +121,18 @@
> tv->tv_sec--;
> }
>
> + wall_to_monotonic.tv_sec += xtime.tv_sec - tv->tv_sec;
> + wall_to_monotonic.tv_nsec += xtime.tv_nsec - tv->tv_nsec;
> +
> + if (wall_to_monotonic.tv_nsec > NSEC_PER_SEC) {
> + wall_to_monotonic.tv_nsec -= NSEC_PER_SEC;
> + wall_to_monotonic.tv_sec++;
> + }
> + if (wall_to_monotonic.tv_nsec < 0) {
> + wall_to_monotonic.tv_nsec += NSEC_PER_SEC;
> + wall_to_monotonic.tv_sec--;
> + }
> +
> xtime.tv_sec = tv->tv_sec;
> xtime.tv_nsec = tv->tv_nsec;
> time_adjust = 0; /* stop active adjtime() */
> @@ -263,6 +275,8 @@
> set_time_cc = init_timer_cc - 0x8126d60e46000000LL +
> (0x3c26700LL*1000000*4096);
> tod_to_timeval(set_time_cc, &xtime);
> + wall_to_monotonic.tv_sec = -xtime.tv_sec;
> + wall_to_monotonic.tv_nsec = -xtime.tv_nsec;

Oops! Missed this one.
>
> /* request the 0x1004 external interrupt */
> if (register_early_external_interrupt(0x1004, do_comparator_interrupt,
>
>

-- George Anzinger george@mvista.com High-res-timers: http://sourceforge.net/projects/high-res-timers/ Preemption patch: http://www.kernel.org/pub/linux/kernel/people/rml

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