[PATCH 00/21] ntp: Rework to prepare support of indenpendent PTP clocks

[PATCH 00/21] ntp: Rework to prepare support of indenpendent PTP clocks

[Anna-Maria Behnsen]

The generic clock and timekeeping infrastructure supports only the already
defined clocks and as they are not independent there is no need of
generalization of data structures. But PTP clocks can be independent from
CLOCK_TAI.

PTP clocks already have clock_gettime() support via the file descriptor
based posix clocks. These interfaces access the PTP hardware and are
therefore slow and cannot be used from within the kernel, e.g. TSN
networking.

This problem can be solved by emulating clock_gettime() via the system
clock source e.g. TSC on x86. Such emulation requires:

1. timekeeping mechanism similar to the existing system timekeeping
2. clock steering equivalent to NTP/adjtimex()

In the already existing system timekeeping implementation the lock and
shadow timekeeper are separate from the timekeeper and sequence
counter. Move this information into a new struct type "tk_data" to be able
to recycle it for the above explained approach.

NTP/adjtimex() related information is all stored in static variables. Move
all of them into the new struct type ntp_data to make it reusable.

Even without the furture support for independent PTP clocks, the
generalization of timekeeping and NTP/adjtimex() improves the structure and
readability of the already existing code.

Once this is implemented clock_gettime() support for these clocks via vdso
can be implement as well but this is an orthogonal task.

This queue covers only the generalization of ntp:

- Patch 1-6:  Basic cleanups
- Patch 7-21: Introduction of struct ntp_data and move all static variables
	      to the struct

The queue is available here:

  git://git.kernel.org/pub/scm/linux/kernel/git/anna-maria/linux-devel.git timers/ptp/ntp

Cc: linux-kernel@vger.kernel.org
Cc: netdev@vger.kernel.org
Cc: Miroslav Lichvar <mlichvar@redhat.com>
Cc: Richard Cochran <richardcochran@gmail.com>
Cc: Christopher S Hall <christopher.s.hall@intel.com>
To: John Stultz <jstultz@google.com>
To: Frederic Weisbecker <frederic@kernel.org>
To: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>

Thanks,

Anna-Maria

---
Anna-Maria Behnsen (1):
      ntp: Cleanup formatting of code

Thomas Gleixner (20):
      ntp: Remove unused tick_nsec
      ntp: Make tick_usec static
      ntp: Clean up comments
      ntp: Convert functions with only two states to bool
      ntp: Read reference time only once
      ntp: Introduce struct ntp_data
      ntp: Move tick_length* into ntp_data
      ntp: Move tick_stat* into ntp_data
      ntp: Move time_offset/constant into ntp_data
      ntp: Move time_max/esterror into ntp_data
      ntp: Move time_freq/reftime into ntp_data
      ntp: Move time_adj/ntp_tick_adj into ntp_data
      ntp: Move ntp_next_leap_sec into ntp_data
      ntp: Move pps_valid into ntp_data
      ntp: Move pps_ft into ntp_data
      ntp: Move pps_jitter into ntp_data
      ntp: Move pps_fbase into ntp_data
      ntp: Move pps_shift/intcnt into ntp_data
      ntp: Move pps_freq/stabil into ntp_data
      ntp: Move pps monitors into ntp_data

 arch/x86/include/asm/timer.h |   2 -
 include/linux/timex.h        |   8 -
 kernel/time/ntp.c            | 840 +++++++++++++++++++++----------------------
 3 files changed, 419 insertions(+), 431 deletions(-)

[PATCH 01/21] ntp: Remove unused tick_nsec

[Anna-Maria Behnsen]

From: Thomas Gleixner <tglx@linutronix.de>

tick_nsec is only updated in the NTP core, but there are no users.

Remove it.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>
---
 arch/x86/include/asm/timer.h | 2 --
 include/linux/timex.h        | 1 -
 kernel/time/ntp.c            | 8 ++------
 3 files changed, 2 insertions(+), 9 deletions(-)

diff --git a/arch/x86/include/asm/timer.h b/arch/x86/include/asm/timer.h
index 7365dd4acffb..23baf8c9b34c 100644
--- a/arch/x86/include/asm/timer.h
+++ b/arch/x86/include/asm/timer.h
@@ -6,8 +6,6 @@
 #include <linux/interrupt.h>
 #include <linux/math64.h>
 
-#define TICK_SIZE (tick_nsec / 1000)
-
 unsigned long long native_sched_clock(void);
 extern void recalibrate_cpu_khz(void);
 
diff --git a/include/linux/timex.h b/include/linux/timex.h
index 3871b06bd302..7f7a12fd8200 100644
--- a/include/linux/timex.h
+++ b/include/linux/timex.h
@@ -145,7 +145,6 @@ unsigned long random_get_entropy_fallback(void);
  * estimated error = NTP dispersion.
  */
 extern unsigned long tick_usec;		/* USER_HZ period (usec) */
-extern unsigned long tick_nsec;		/* SHIFTED_HZ period (nsec) */
 
 /* Required to safely shift negative values */
 #define shift_right(x, s) ({	\
diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index 8d2dd214ec68..0dba1179d81d 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -33,9 +33,6 @@
 /* USER_HZ period (usecs): */
 unsigned long			tick_usec = USER_TICK_USEC;
 
-/* SHIFTED_HZ period (nsecs): */
-unsigned long			tick_nsec;
-
 static u64			tick_length;
 static u64			tick_length_base;
 
@@ -253,8 +250,8 @@ static inline int ntp_synced(void)
  */
 
 /*
- * Update (tick_length, tick_length_base, tick_nsec), based
- * on (tick_usec, ntp_tick_adj, time_freq):
+ * Update tick_length and tick_length_base, based on tick_usec, ntp_tick_adj and
+ * time_freq:
  */
 static void ntp_update_frequency(void)
 {
@@ -267,7 +264,6 @@ static void ntp_update_frequency(void)
 	second_length		+= ntp_tick_adj;
 	second_length		+= time_freq;
 
-	tick_nsec		 = div_u64(second_length, HZ) >> NTP_SCALE_SHIFT;
 	new_base		 = div_u64(second_length, NTP_INTERVAL_FREQ);
 
 	/*

-- 
2.39.2

[PATCH 02/21] ntp: Make tick_usec static

[Anna-Maria Behnsen]

From: Thomas Gleixner <tglx@linutronix.de>

There are no users of tick_usec outside of the NTP core code. Therefore
make tick_usec static.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>
---
 include/linux/timex.h | 7 -------
 kernel/time/ntp.c     | 5 ++++-
 2 files changed, 4 insertions(+), 8 deletions(-)

diff --git a/include/linux/timex.h b/include/linux/timex.h
index 7f7a12fd8200..4ee32eff3f22 100644
--- a/include/linux/timex.h
+++ b/include/linux/timex.h
@@ -139,13 +139,6 @@ unsigned long random_get_entropy_fallback(void);
 #define MAXSEC 2048		/* max interval between updates (s) */
 #define NTP_PHASE_LIMIT ((MAXPHASE / NSEC_PER_USEC) << 5) /* beyond max. dispersion */
 
-/*
- * kernel variables
- * Note: maximum error = NTP sync distance = dispersion + delay / 2;
- * estimated error = NTP dispersion.
- */
-extern unsigned long tick_usec;		/* USER_HZ period (usec) */
-
 /* Required to safely shift negative values */
 #define shift_right(x, s) ({	\
 	__typeof__(x) __x = (x);	\
diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index 0dba1179d81d..8e68a85996f7 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -31,7 +31,7 @@
 
 
 /* USER_HZ period (usecs): */
-unsigned long			tick_usec = USER_TICK_USEC;
+static unsigned long		tick_usec = USER_TICK_USEC;
 
 static u64			tick_length;
 static u64			tick_length_base;
@@ -44,6 +44,9 @@ static u64			tick_length_base;
 
 /*
  * phase-lock loop variables
+ *
+ * Note: maximum error = NTP sync distance = dispersion + delay / 2;
+ * estimated error = NTP dispersion.
  */
 
 /*

-- 
2.39.2

[PATCH 03/21] ntp: Clean up comments

[Anna-Maria Behnsen]

From: Thomas Gleixner <tglx@linutronix.de>

Usage of different comment formatting makes fast reading and parsing the
code harder. There are several multi-line comments which do not follow the
coding style by starting with a line only containing '/*'. There are also
comments which do not start with capitals.

Clean up all those comments to be consistent and remove comments which
document the obvious.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>
---
 kernel/time/ntp.c | 144 +++++++++++++++++++++++++++++-------------------------
 1 file changed, 78 insertions(+), 66 deletions(-)

diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index 8e68a85996f7..99213d931f63 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -119,7 +119,8 @@ static long pps_stbcnt;		/* stability limit exceeded */
 static long pps_errcnt;		/* calibration errors */
 
 
-/* PPS kernel consumer compensates the whole phase error immediately.
+/*
+ * PPS kernel consumer compensates the whole phase error immediately.
  * Otherwise, reduce the offset by a fixed factor times the time constant.
  */
 static inline s64 ntp_offset_chunk(s64 offset)
@@ -132,8 +133,7 @@ static inline s64 ntp_offset_chunk(s64 offset)
 
 static inline void pps_reset_freq_interval(void)
 {
-	/* the PPS calibration interval may end
-	   surprisingly early */
+	/* The PPS calibration interval may end surprisingly early */
 	pps_shift = PPS_INTMIN;
 	pps_intcnt = 0;
 }
@@ -151,9 +151,9 @@ static inline void pps_clear(void)
 	pps_freq = 0;
 }
 
-/* Decrease pps_valid to indicate that another second has passed since
- * the last PPS signal. When it reaches 0, indicate that PPS signal is
- * missing.
+/*
+ * Decrease pps_valid to indicate that another second has passed since the
+ * last PPS signal. When it reaches 0, indicate that PPS signal is missing.
  */
 static inline void pps_dec_valid(void)
 {
@@ -174,17 +174,21 @@ static inline void pps_set_freq(s64 freq)
 static inline int is_error_status(int status)
 {
 	return (status & (STA_UNSYNC|STA_CLOCKERR))
-		/* PPS signal lost when either PPS time or
-		 * PPS frequency synchronization requested
+		/*
+		 * PPS signal lost when either PPS time or PPS frequency
+		 * synchronization requested
 		 */
 		|| ((status & (STA_PPSFREQ|STA_PPSTIME))
 			&& !(status & STA_PPSSIGNAL))
-		/* PPS jitter exceeded when
-		 * PPS time synchronization requested */
+		/*
+		 * PPS jitter exceeded when PPS time synchronization
+		 * requested
+		 */
 		|| ((status & (STA_PPSTIME|STA_PPSJITTER))
 			== (STA_PPSTIME|STA_PPSJITTER))
-		/* PPS wander exceeded or calibration error when
-		 * PPS frequency synchronization requested
+		/*
+		 * PPS wander exceeded or calibration error when PPS
+		 * frequency synchronization requested
 		 */
 		|| ((status & STA_PPSFREQ)
 			&& (status & (STA_PPSWANDER|STA_PPSERROR)));
@@ -270,8 +274,8 @@ static void ntp_update_frequency(void)
 	new_base		 = div_u64(second_length, NTP_INTERVAL_FREQ);
 
 	/*
-	 * Don't wait for the next second_overflow, apply
-	 * the change to the tick length immediately:
+	 * Don't wait for the next second_overflow, apply the change to the
+	 * tick length immediately:
 	 */
 	tick_length		+= new_base - tick_length_base;
 	tick_length_base	 = new_base;
@@ -307,10 +311,7 @@ static void ntp_update_offset(long offset)
 		offset *= NSEC_PER_USEC;
 	}
 
-	/*
-	 * Scale the phase adjustment and
-	 * clamp to the operating range.
-	 */
+	/* Scale the phase adjustment and clamp to the operating range. */
 	offset = clamp(offset, -MAXPHASE, MAXPHASE);
 
 	/*
@@ -349,7 +350,8 @@ static void ntp_update_offset(long offset)
  */
 void ntp_clear(void)
 {
-	time_adjust	= 0;		/* stop active adjtime() */
+	/* Stop active adjtime() */
+	time_adjust	= 0;
 	time_status	|= STA_UNSYNC;
 	time_maxerror	= NTP_PHASE_LIMIT;
 	time_esterror	= NTP_PHASE_LIMIT;
@@ -387,7 +389,7 @@ ktime_t ntp_get_next_leap(void)
 }
 
 /*
- * this routine handles the overflow of the microsecond field
+ * This routine handles the overflow of the microsecond field
  *
  * The tricky bits of code to handle the accurate clock support
  * were provided by Dave Mills (Mills@UDEL.EDU) of NTP fame.
@@ -452,7 +454,6 @@ int second_overflow(time64_t secs)
 		break;
 	}
 
-
 	/* Bump the maxerror field */
 	time_maxerror += MAXFREQ / NSEC_PER_USEC;
 	if (time_maxerror > NTP_PHASE_LIMIT) {
@@ -688,7 +689,7 @@ static inline void process_adj_status(const struct __kernel_timex *txc)
 		time_state = TIME_OK;
 		time_status = STA_UNSYNC;
 		ntp_next_leap_sec = TIME64_MAX;
-		/* restart PPS frequency calibration */
+		/* Restart PPS frequency calibration */
 		pps_reset_freq_interval();
 	}
 
@@ -699,7 +700,7 @@ static inline void process_adj_status(const struct __kernel_timex *txc)
 	if (!(time_status & STA_PLL) && (txc->status & STA_PLL))
 		time_reftime = __ktime_get_real_seconds();
 
-	/* only set allowed bits */
+	/* Only set allowed bits */
 	time_status &= STA_RONLY;
 	time_status |= txc->status & ~STA_RONLY;
 }
@@ -721,7 +722,7 @@ static inline void process_adjtimex_modes(const struct __kernel_timex *txc,
 		time_freq = txc->freq * PPM_SCALE;
 		time_freq = min(time_freq, MAXFREQ_SCALED);
 		time_freq = max(time_freq, -MAXFREQ_SCALED);
-		/* update pps_freq */
+		/* Update pps_freq */
 		pps_set_freq(time_freq);
 	}
 
@@ -754,7 +755,7 @@ static inline void process_adjtimex_modes(const struct __kernel_timex *txc,
 
 
 /*
- * adjtimex mainly allows reading (and writing, if superuser) of
+ * adjtimex() mainly allows reading (and writing, if superuser) of
  * kernel time-keeping variables. used by xntpd.
  */
 int __do_adjtimex(struct __kernel_timex *txc, const struct timespec64 *ts,
@@ -798,8 +799,7 @@ int __do_adjtimex(struct __kernel_timex *txc, const struct timespec64 *ts,
 			txc->offset = (u32)txc->offset / NSEC_PER_USEC;
 	}
 
-	result = time_state;	/* mostly `TIME_OK' */
-	/* check for errors */
+	result = time_state;
 	if (is_error_status(time_status))
 		result = TIME_ERROR;
 
@@ -814,7 +814,7 @@ int __do_adjtimex(struct __kernel_timex *txc, const struct timespec64 *ts,
 	txc->tick	   = tick_usec;
 	txc->tai	   = *time_tai;
 
-	/* fill PPS status fields */
+	/* Fill PPS status fields */
 	pps_fill_timex(txc);
 
 	txc->time.tv_sec = ts->tv_sec;
@@ -845,17 +845,21 @@ int __do_adjtimex(struct __kernel_timex *txc, const struct timespec64 *ts,
 
 #ifdef	CONFIG_NTP_PPS
 
-/* actually struct pps_normtime is good old struct timespec, but it is
+/*
+ * struct pps_normtime is basically a struct timespec, but it is
  * semantically different (and it is the reason why it was invented):
  * pps_normtime.nsec has a range of ( -NSEC_PER_SEC / 2, NSEC_PER_SEC / 2 ]
- * while timespec.tv_nsec has a range of [0, NSEC_PER_SEC) */
+ * while timespec.tv_nsec has a range of [0, NSEC_PER_SEC)
+ */
 struct pps_normtime {
 	s64		sec;	/* seconds */
 	long		nsec;	/* nanoseconds */
 };
 
-/* normalize the timestamp so that nsec is in the
-   ( -NSEC_PER_SEC / 2, NSEC_PER_SEC / 2 ] interval */
+/*
+ * Normalize the timestamp so that nsec is in the
+ * [ -NSEC_PER_SEC / 2, NSEC_PER_SEC / 2 ] interval
+ */
 static inline struct pps_normtime pps_normalize_ts(struct timespec64 ts)
 {
 	struct pps_normtime norm = {
@@ -871,7 +875,7 @@ static inline struct pps_normtime pps_normalize_ts(struct timespec64 ts)
 	return norm;
 }
 
-/* get current phase correction and jitter */
+/* Get current phase correction and jitter */
 static inline long pps_phase_filter_get(long *jitter)
 {
 	*jitter = pps_tf[0] - pps_tf[1];
@@ -882,7 +886,7 @@ static inline long pps_phase_filter_get(long *jitter)
 	return pps_tf[0];
 }
 
-/* add the sample to the phase filter */
+/* Add the sample to the phase filter */
 static inline void pps_phase_filter_add(long err)
 {
 	pps_tf[2] = pps_tf[1];
@@ -890,8 +894,9 @@ static inline void pps_phase_filter_add(long err)
 	pps_tf[0] = err;
 }
 
-/* decrease frequency calibration interval length.
- * It is halved after four consecutive unstable intervals.
+/*
+ * Decrease frequency calibration interval length. It is halved after four
+ * consecutive unstable intervals.
  */
 static inline void pps_dec_freq_interval(void)
 {
@@ -904,8 +909,9 @@ static inline void pps_dec_freq_interval(void)
 	}
 }
 
-/* increase frequency calibration interval length.
- * It is doubled after four consecutive stable intervals.
+/*
+ * Increase frequency calibration interval length. It is doubled after
+ * four consecutive stable intervals.
  */
 static inline void pps_inc_freq_interval(void)
 {
@@ -918,7 +924,8 @@ static inline void pps_inc_freq_interval(void)
 	}
 }
 
-/* update clock frequency based on MONOTONIC_RAW clock PPS signal
+/*
+ * Update clock frequency based on MONOTONIC_RAW clock PPS signal
  * timestamps
  *
  * At the end of the calibration interval the difference between the
@@ -932,7 +939,7 @@ static long hardpps_update_freq(struct pps_normtime freq_norm)
 	long delta, delta_mod;
 	s64 ftemp;
 
-	/* check if the frequency interval was too long */
+	/* Check if the frequency interval was too long */
 	if (freq_norm.sec > (2 << pps_shift)) {
 		time_status |= STA_PPSERROR;
 		pps_errcnt++;
@@ -943,9 +950,10 @@ static long hardpps_update_freq(struct pps_normtime freq_norm)
 		return 0;
 	}
 
-	/* here the raw frequency offset and wander (stability) is
-	 * calculated. If the wander is less than the wander threshold
-	 * the interval is increased; otherwise it is decreased.
+	/*
+	 * Here the raw frequency offset and wander (stability) is
+	 * calculated. If the wander is less than the wander threshold the
+	 * interval is increased; otherwise it is decreased.
 	 */
 	ftemp = div_s64(((s64)(-freq_norm.nsec)) << NTP_SCALE_SHIFT,
 			freq_norm.sec);
@@ -957,13 +965,14 @@ static long hardpps_update_freq(struct pps_normtime freq_norm)
 		time_status |= STA_PPSWANDER;
 		pps_stbcnt++;
 		pps_dec_freq_interval();
-	} else {	/* good sample */
+	} else {
+		/* Good sample */
 		pps_inc_freq_interval();
 	}
 
-	/* the stability metric is calculated as the average of recent
-	 * frequency changes, but is used only for performance
-	 * monitoring
+	/*
+	 * The stability metric is calculated as the average of recent
+	 * frequency changes, but is used only for performance monitoring
 	 */
 	delta_mod = delta;
 	if (delta_mod < 0)
@@ -972,7 +981,7 @@ static long hardpps_update_freq(struct pps_normtime freq_norm)
 				(NTP_SCALE_SHIFT - SHIFT_USEC),
 				NSEC_PER_USEC) - pps_stabil) >> PPS_INTMIN;
 
-	/* if enabled, the system clock frequency is updated */
+	/* If enabled, the system clock frequency is updated */
 	if ((time_status & STA_PPSFREQ) != 0 &&
 	    (time_status & STA_FREQHOLD) == 0) {
 		time_freq = pps_freq;
@@ -982,17 +991,18 @@ static long hardpps_update_freq(struct pps_normtime freq_norm)
 	return delta;
 }
 
-/* correct REALTIME clock phase error against PPS signal */
+/* Correct REALTIME clock phase error against PPS signal */
 static void hardpps_update_phase(long error)
 {
 	long correction = -error;
 	long jitter;
 
-	/* add the sample to the median filter */
+	/* Add the sample to the median filter */
 	pps_phase_filter_add(correction);
 	correction = pps_phase_filter_get(&jitter);
 
-	/* Nominal jitter is due to PPS signal noise. If it exceeds the
+	/*
+	 * Nominal jitter is due to PPS signal noise. If it exceeds the
 	 * threshold, the sample is discarded; otherwise, if so enabled,
 	 * the time offset is updated.
 	 */
@@ -1003,13 +1013,13 @@ static void hardpps_update_phase(long error)
 		time_status |= STA_PPSJITTER;
 		pps_jitcnt++;
 	} else if (time_status & STA_PPSTIME) {
-		/* correct the time using the phase offset */
+		/* Correct the time using the phase offset */
 		time_offset = div_s64(((s64)correction) << NTP_SCALE_SHIFT,
 				NTP_INTERVAL_FREQ);
-		/* cancel running adjtime() */
+		/* Cancel running adjtime() */
 		time_adjust = 0;
 	}
-	/* update jitter */
+	/* Update jitter */
 	pps_jitter += (jitter - pps_jitter) >> PPS_INTMIN;
 }
 
@@ -1031,41 +1041,43 @@ void __hardpps(const struct timespec64 *phase_ts, const struct timespec64 *raw_t
 
 	pts_norm = pps_normalize_ts(*phase_ts);
 
-	/* clear the error bits, they will be set again if needed */
+	/* Clear the error bits, they will be set again if needed */
 	time_status &= ~(STA_PPSJITTER | STA_PPSWANDER | STA_PPSERROR);
 
-	/* indicate signal presence */
+	/* Indicate signal presence */
 	time_status |= STA_PPSSIGNAL;
 	pps_valid = PPS_VALID;
 
-	/* when called for the first time,
-	 * just start the frequency interval */
+	/*
+	 * When called for the first time, just start the frequency
+	 * interval
+	 */
 	if (unlikely(pps_fbase.tv_sec == 0)) {
 		pps_fbase = *raw_ts;
 		return;
 	}
 
-	/* ok, now we have a base for frequency calculation */
+	/* Ok, now we have a base for frequency calculation */
 	freq_norm = pps_normalize_ts(timespec64_sub(*raw_ts, pps_fbase));
 
-	/* check that the signal is in the range
-	 * [1s - MAXFREQ us, 1s + MAXFREQ us], otherwise reject it */
+	/*
+	 * Check that the signal is in the range
+	 * [1s - MAXFREQ us, 1s + MAXFREQ us], otherwise reject it
+	 */
 	if ((freq_norm.sec == 0) ||
 			(freq_norm.nsec > MAXFREQ * freq_norm.sec) ||
 			(freq_norm.nsec < -MAXFREQ * freq_norm.sec)) {
 		time_status |= STA_PPSJITTER;
-		/* restart the frequency calibration interval */
+		/* Restart the frequency calibration interval */
 		pps_fbase = *raw_ts;
 		printk_deferred(KERN_ERR "hardpps: PPSJITTER: bad pulse\n");
 		return;
 	}
 
-	/* signal is ok */
-
-	/* check if the current frequency interval is finished */
+	/* Signal is ok. Check if the current frequency interval is finished */
 	if (freq_norm.sec >= (1 << pps_shift)) {
 		pps_calcnt++;
-		/* restart the frequency calibration interval */
+		/* Restart the frequency calibration interval */
 		pps_fbase = *raw_ts;
 		hardpps_update_freq(freq_norm);
 	}

-- 
2.39.2

[PATCH 04/21] ntp: Cleanup formatting of code

[Anna-Maria Behnsen]

Code is partially formatted in a creative way which makes reading
harder. Examples are function calls over several lines where the
indentation does not start at the same height then the open bracket after
the function name.

Improve formatting but do not make a functional change.

Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>
---
 kernel/time/ntp.c | 37 +++++++++++++------------------------
 1 file changed, 13 insertions(+), 24 deletions(-)

diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index 99213d931f63..eca9de85b0a7 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -428,8 +428,7 @@ int second_overflow(time64_t secs)
 		} else if (secs == ntp_next_leap_sec) {
 			leap = -1;
 			time_state = TIME_OOP;
-			printk(KERN_NOTICE
-				"Clock: inserting leap second 23:59:60 UTC\n");
+			pr_notice("Clock: inserting leap second 23:59:60 UTC\n");
 		}
 		break;
 	case TIME_DEL:
@@ -440,8 +439,7 @@ int second_overflow(time64_t secs)
 			leap = 1;
 			ntp_next_leap_sec = TIME64_MAX;
 			time_state = TIME_WAIT;
-			printk(KERN_NOTICE
-				"Clock: deleting leap second 23:59:59 UTC\n");
+			pr_notice("Clock: deleting leap second 23:59:59 UTC\n");
 		}
 		break;
 	case TIME_OOP:
@@ -834,10 +832,8 @@ int __do_adjtimex(struct __kernel_timex *txc, const struct timespec64 *ts,
 			txc->tai--;
 			txc->time.tv_sec++;
 		}
-		if ((time_state == TIME_OOP) &&
-					(ts->tv_sec == ntp_next_leap_sec)) {
+		if ((time_state == TIME_OOP) &&	(ts->tv_sec == ntp_next_leap_sec))
 			result = TIME_WAIT;
-		}
 	}
 
 	return result;
@@ -944,9 +940,8 @@ static long hardpps_update_freq(struct pps_normtime freq_norm)
 		time_status |= STA_PPSERROR;
 		pps_errcnt++;
 		pps_dec_freq_interval();
-		printk_deferred(KERN_ERR
-			"hardpps: PPSERROR: interval too long - %lld s\n",
-			freq_norm.sec);
+		printk_deferred(KERN_ERR "hardpps: PPSERROR: interval too long - %lld s\n",
+				freq_norm.sec);
 		return 0;
 	}
 
@@ -960,8 +955,7 @@ static long hardpps_update_freq(struct pps_normtime freq_norm)
 	delta = shift_right(ftemp - pps_freq, NTP_SCALE_SHIFT);
 	pps_freq = ftemp;
 	if (delta > PPS_MAXWANDER || delta < -PPS_MAXWANDER) {
-		printk_deferred(KERN_WARNING
-				"hardpps: PPSWANDER: change=%ld\n", delta);
+		printk_deferred(KERN_WARNING "hardpps: PPSWANDER: change=%ld\n", delta);
 		time_status |= STA_PPSWANDER;
 		pps_stbcnt++;
 		pps_dec_freq_interval();
@@ -977,13 +971,11 @@ static long hardpps_update_freq(struct pps_normtime freq_norm)
 	delta_mod = delta;
 	if (delta_mod < 0)
 		delta_mod = -delta_mod;
-	pps_stabil += (div_s64(((s64)delta_mod) <<
-				(NTP_SCALE_SHIFT - SHIFT_USEC),
-				NSEC_PER_USEC) - pps_stabil) >> PPS_INTMIN;
+	pps_stabil += (div_s64(((s64)delta_mod) << (NTP_SCALE_SHIFT - SHIFT_USEC),
+			       NSEC_PER_USEC) - pps_stabil) >> PPS_INTMIN;
 
 	/* If enabled, the system clock frequency is updated */
-	if ((time_status & STA_PPSFREQ) != 0 &&
-	    (time_status & STA_FREQHOLD) == 0) {
+	if ((time_status & STA_PPSFREQ) && !(time_status & STA_FREQHOLD)) {
 		time_freq = pps_freq;
 		ntp_update_frequency();
 	}
@@ -1007,15 +999,13 @@ static void hardpps_update_phase(long error)
 	 * the time offset is updated.
 	 */
 	if (jitter > (pps_jitter << PPS_POPCORN)) {
-		printk_deferred(KERN_WARNING
-				"hardpps: PPSJITTER: jitter=%ld, limit=%ld\n",
+		printk_deferred(KERN_WARNING "hardpps: PPSJITTER: jitter=%ld, limit=%ld\n",
 				jitter, (pps_jitter << PPS_POPCORN));
 		time_status |= STA_PPSJITTER;
 		pps_jitcnt++;
 	} else if (time_status & STA_PPSTIME) {
 		/* Correct the time using the phase offset */
-		time_offset = div_s64(((s64)correction) << NTP_SCALE_SHIFT,
-				NTP_INTERVAL_FREQ);
+		time_offset = div_s64(((s64)correction) << NTP_SCALE_SHIFT, NTP_INTERVAL_FREQ);
 		/* Cancel running adjtime() */
 		time_adjust = 0;
 	}
@@ -1064,9 +1054,8 @@ void __hardpps(const struct timespec64 *phase_ts, const struct timespec64 *raw_t
 	 * Check that the signal is in the range
 	 * [1s - MAXFREQ us, 1s + MAXFREQ us], otherwise reject it
 	 */
-	if ((freq_norm.sec == 0) ||
-			(freq_norm.nsec > MAXFREQ * freq_norm.sec) ||
-			(freq_norm.nsec < -MAXFREQ * freq_norm.sec)) {
+	if ((freq_norm.sec == 0) || (freq_norm.nsec > MAXFREQ * freq_norm.sec) ||
+	    (freq_norm.nsec < -MAXFREQ * freq_norm.sec)) {
 		time_status |= STA_PPSJITTER;
 		/* Restart the frequency calibration interval */
 		pps_fbase = *raw_ts;

-- 
2.39.2

[PATCH 05/21] ntp: Convert functions with only two states to bool

[Anna-Maria Behnsen]

From: Thomas Gleixner <tglx@linutronix.de>

is_error_status() and ntp_synced() return whether a state is set or
not. Both functions use unsigned int for it even if it would be a perfect
job for a bool.

Use bool instead of unsigned int. And while at it, move ntp_synced()
function to the place where it is used.

No functional change.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>
---
 kernel/time/ntp.c | 28 +++++++++++-----------------
 1 file changed, 11 insertions(+), 17 deletions(-)

diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index eca9de85b0a7..ef758aafdfd5 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -171,7 +171,7 @@ static inline void pps_set_freq(s64 freq)
 	pps_freq = freq;
 }
 
-static inline int is_error_status(int status)
+static inline bool is_error_status(int status)
 {
 	return (status & (STA_UNSYNC|STA_CLOCKERR))
 		/*
@@ -221,7 +221,7 @@ static inline void pps_clear(void) {}
 static inline void pps_dec_valid(void) {}
 static inline void pps_set_freq(s64 freq) {}
 
-static inline int is_error_status(int status)
+static inline bool is_error_status(int status)
 {
 	return status & (STA_UNSYNC|STA_CLOCKERR);
 }
@@ -241,21 +241,6 @@ static inline void pps_fill_timex(struct __kernel_timex *txc)
 
 #endif /* CONFIG_NTP_PPS */
 
-
-/**
- * ntp_synced - Returns 1 if the NTP status is not UNSYNC
- *
- */
-static inline int ntp_synced(void)
-{
-	return !(time_status & STA_UNSYNC);
-}
-
-
-/*
- * NTP methods:
- */
-
 /*
  * Update tick_length and tick_length_base, based on tick_usec, ntp_tick_adj and
  * time_freq:
@@ -609,6 +594,15 @@ static inline int update_rtc(struct timespec64 *to_set, unsigned long *offset_ns
 }
 #endif
 
+/**
+ * ntp_synced - Tells whether the NTP status is not UNSYNC
+ * Returns:	true if not UNSYNC, false otherwise
+ */
+static inline bool ntp_synced(void)
+{
+	return !(time_status & STA_UNSYNC);
+}
+
 /*
  * If we have an externally synchronized Linux clock, then update RTC clock
  * accordingly every ~11 minutes. Generally RTCs can only store second

-- 
2.39.2

[PATCH 06/21] ntp: Read reference time only once

[Anna-Maria Behnsen]

From: Thomas Gleixner <tglx@linutronix.de>

The reference time is required twice in ntp_update_offset(). It will not
change in the meantime as the calling code holds the timekeeper lock. Read
it only once and store it into a local variable.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>
---
 kernel/time/ntp.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index ef758aafdfd5..477cb08062bc 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -283,9 +283,8 @@ static inline s64 ntp_update_offset_fll(s64 offset64, long secs)
 
 static void ntp_update_offset(long offset)
 {
-	s64 freq_adj;
-	s64 offset64;
-	long secs;
+	s64 freq_adj, offset64;
+	long secs, real_secs;
 
 	if (!(time_status & STA_PLL))
 		return;
@@ -303,11 +302,12 @@ static void ntp_update_offset(long offset)
 	 * Select how the frequency is to be controlled
 	 * and in which mode (PLL or FLL).
 	 */
-	secs = (long)(__ktime_get_real_seconds() - time_reftime);
+	real_secs = __ktime_get_real_seconds();
+	secs = (long)(real_secs - time_reftime);
 	if (unlikely(time_status & STA_FREQHOLD))
 		secs = 0;
 
-	time_reftime = __ktime_get_real_seconds();
+	time_reftime = real_secs;
 
 	offset64    = offset;
 	freq_adj    = ntp_update_offset_fll(offset64, secs);

-- 
2.39.2

[PATCH 07/21] ntp: Introduce struct ntp_data

[Anna-Maria Behnsen]

From: Thomas Gleixner <tglx@linutronix.de>

All NTP data is held in static variables. That prevents the NTP code from
being reuasble for non-system time timekeepers, e.g. per PTP clock
timekeeping.

Introduce struct ntp_data and move tick_usec into it for a start.

No functional change.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>
---
 kernel/time/ntp.c | 65 ++++++++++++++++++++++++++++++-------------------------
 1 file changed, 36 insertions(+), 29 deletions(-)

diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index 477cb08062bc..0222f8e46081 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -22,16 +22,19 @@
 #include "ntp_internal.h"
 #include "timekeeping_internal.h"
 
-
-/*
- * NTP timekeeping variables:
+/**
+ * struct ntp_data - Structure holding all NTP related state
+ * @tick_usec:		USER_HZ period in microseconds
  *
- * Note: All of the NTP state is protected by the timekeeping locks.
+ * Protected by the timekeeping locks.
  */
+struct ntp_data {
+	unsigned long		tick_usec;
+};
 
-
-/* USER_HZ period (usecs): */
-static unsigned long		tick_usec = USER_TICK_USEC;
+static struct ntp_data tk_ntp_data = {
+	.tick_usec		= USER_TICK_USEC,
+};
 
 static u64			tick_length;
 static u64			tick_length_base;
@@ -245,13 +248,11 @@ static inline void pps_fill_timex(struct __kernel_timex *txc)
  * Update tick_length and tick_length_base, based on tick_usec, ntp_tick_adj and
  * time_freq:
  */
-static void ntp_update_frequency(void)
+static void ntp_update_frequency(struct ntp_data *ntpdata)
 {
-	u64 second_length;
-	u64 new_base;
+	u64 second_length, new_base, tick_usec = (u64)ntpdata->tick_usec;
 
-	second_length		 = (u64)(tick_usec * NSEC_PER_USEC * USER_HZ)
-						<< NTP_SCALE_SHIFT;
+	second_length		 = (u64)(tick_usec * NSEC_PER_USEC * USER_HZ) << NTP_SCALE_SHIFT;
 
 	second_length		+= ntp_tick_adj;
 	second_length		+= time_freq;
@@ -330,10 +331,7 @@ static void ntp_update_offset(long offset)
 	time_offset = div_s64(offset64 << NTP_SCALE_SHIFT, NTP_INTERVAL_FREQ);
 }
 
-/**
- * ntp_clear - Clears the NTP state variables
- */
-void ntp_clear(void)
+static void __ntp_clear(struct ntp_data *ntpdata)
 {
 	/* Stop active adjtime() */
 	time_adjust	= 0;
@@ -341,7 +339,7 @@ void ntp_clear(void)
 	time_maxerror	= NTP_PHASE_LIMIT;
 	time_esterror	= NTP_PHASE_LIMIT;
 
-	ntp_update_frequency();
+	ntp_update_frequency(ntpdata);
 
 	tick_length	= tick_length_base;
 	time_offset	= 0;
@@ -351,6 +349,14 @@ void ntp_clear(void)
 	pps_clear();
 }
 
+/**
+ * ntp_clear - Clears the NTP state variables
+ */
+void ntp_clear(void)
+{
+	__ntp_clear(&tk_ntp_data);
+}
+
 
 u64 ntp_tick_length(void)
 {
@@ -698,7 +704,7 @@ static inline void process_adj_status(const struct __kernel_timex *txc)
 }
 
 
-static inline void process_adjtimex_modes(const struct __kernel_timex *txc,
+static inline void process_adjtimex_modes(struct ntp_data *ntpdata, const struct __kernel_timex *txc,
 					  s32 *time_tai)
 {
 	if (txc->modes & ADJ_STATUS)
@@ -739,13 +745,12 @@ static inline void process_adjtimex_modes(const struct __kernel_timex *txc,
 		ntp_update_offset(txc->offset);
 
 	if (txc->modes & ADJ_TICK)
-		tick_usec = txc->tick;
+		ntpdata->tick_usec = txc->tick;
 
 	if (txc->modes & (ADJ_TICK|ADJ_FREQUENCY|ADJ_OFFSET))
-		ntp_update_frequency();
+		ntp_update_frequency(ntpdata);
 }
 
-
 /*
  * adjtimex() mainly allows reading (and writing, if superuser) of
  * kernel time-keeping variables. used by xntpd.
@@ -753,6 +758,7 @@ static inline void process_adjtimex_modes(const struct __kernel_timex *txc,
 int __do_adjtimex(struct __kernel_timex *txc, const struct timespec64 *ts,
 		  s32 *time_tai, struct audit_ntp_data *ad)
 {
+	struct ntp_data *ntpdata = &tk_ntp_data;
 	int result;
 
 	if (txc->modes & ADJ_ADJTIME) {
@@ -761,7 +767,7 @@ int __do_adjtimex(struct __kernel_timex *txc, const struct timespec64 *ts,
 		if (!(txc->modes & ADJ_OFFSET_READONLY)) {
 			/* adjtime() is independent from ntp_adjtime() */
 			time_adjust = txc->offset;
-			ntp_update_frequency();
+			ntp_update_frequency(ntpdata);
 
 			audit_ntp_set_old(ad, AUDIT_NTP_ADJUST,	save_adjust);
 			audit_ntp_set_new(ad, AUDIT_NTP_ADJUST,	time_adjust);
@@ -774,15 +780,15 @@ int __do_adjtimex(struct __kernel_timex *txc, const struct timespec64 *ts,
 			audit_ntp_set_old(ad, AUDIT_NTP_FREQ,	time_freq);
 			audit_ntp_set_old(ad, AUDIT_NTP_STATUS,	time_status);
 			audit_ntp_set_old(ad, AUDIT_NTP_TAI,	*time_tai);
-			audit_ntp_set_old(ad, AUDIT_NTP_TICK,	tick_usec);
+			audit_ntp_set_old(ad, AUDIT_NTP_TICK,	ntpdata->tick_usec);
 
-			process_adjtimex_modes(txc, time_tai);
+			process_adjtimex_modes(ntpdata, txc, time_tai);
 
 			audit_ntp_set_new(ad, AUDIT_NTP_OFFSET,	time_offset);
 			audit_ntp_set_new(ad, AUDIT_NTP_FREQ,	time_freq);
 			audit_ntp_set_new(ad, AUDIT_NTP_STATUS,	time_status);
 			audit_ntp_set_new(ad, AUDIT_NTP_TAI,	*time_tai);
-			audit_ntp_set_new(ad, AUDIT_NTP_TICK,	tick_usec);
+			audit_ntp_set_new(ad, AUDIT_NTP_TICK,	ntpdata->tick_usec);
 		}
 
 		txc->offset = shift_right(time_offset * NTP_INTERVAL_FREQ,
@@ -803,7 +809,7 @@ int __do_adjtimex(struct __kernel_timex *txc, const struct timespec64 *ts,
 	txc->constant	   = time_constant;
 	txc->precision	   = 1;
 	txc->tolerance	   = MAXFREQ_SCALED / PPM_SCALE;
-	txc->tick	   = tick_usec;
+	txc->tick	   = ntpdata->tick_usec;
 	txc->tai	   = *time_tai;
 
 	/* Fill PPS status fields */
@@ -924,7 +930,7 @@ static inline void pps_inc_freq_interval(void)
  * too long, the data are discarded.
  * Returns the difference between old and new frequency values.
  */
-static long hardpps_update_freq(struct pps_normtime freq_norm)
+static long hardpps_update_freq(struct ntp_data *ntpdata, struct pps_normtime freq_norm)
 {
 	long delta, delta_mod;
 	s64 ftemp;
@@ -971,7 +977,7 @@ static long hardpps_update_freq(struct pps_normtime freq_norm)
 	/* If enabled, the system clock frequency is updated */
 	if ((time_status & STA_PPSFREQ) && !(time_status & STA_FREQHOLD)) {
 		time_freq = pps_freq;
-		ntp_update_frequency();
+		ntp_update_frequency(ntpdata);
 	}
 
 	return delta;
@@ -1022,6 +1028,7 @@ static void hardpps_update_phase(long error)
 void __hardpps(const struct timespec64 *phase_ts, const struct timespec64 *raw_ts)
 {
 	struct pps_normtime pts_norm, freq_norm;
+	struct ntp_data *ntpdata = &tk_ntp_data;
 
 	pts_norm = pps_normalize_ts(*phase_ts);
 
@@ -1062,7 +1069,7 @@ void __hardpps(const struct timespec64 *phase_ts, const struct timespec64 *raw_t
 		pps_calcnt++;
 		/* Restart the frequency calibration interval */
 		pps_fbase = *raw_ts;
-		hardpps_update_freq(freq_norm);
+		hardpps_update_freq(ntpdata, freq_norm);
 	}
 
 	hardpps_update_phase(pts_norm.nsec);

-- 
2.39.2

[PATCH 08/21] ntp: Move tick_length* into ntp_data

[Anna-Maria Behnsen]

From: Thomas Gleixner <tglx@linutronix.de>

Continue the conversion from static variables to struct based data.

No functional change.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>
---
 kernel/time/ntp.c | 34 ++++++++++++++++++----------------
 1 file changed, 18 insertions(+), 16 deletions(-)

diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index 0222f8e46081..6c5f684328c8 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -25,20 +25,21 @@
 /**
  * struct ntp_data - Structure holding all NTP related state
  * @tick_usec:		USER_HZ period in microseconds
+ * @tick_length:	Adjusted tick length
+ * @tick_length_base:	Base value for @tick_length
  *
  * Protected by the timekeeping locks.
  */
 struct ntp_data {
 	unsigned long		tick_usec;
+	u64			tick_length;
+	u64			tick_length_base;
 };
 
 static struct ntp_data tk_ntp_data = {
 	.tick_usec		= USER_TICK_USEC,
 };
 
-static u64			tick_length;
-static u64			tick_length_base;
-
 #define SECS_PER_DAY		86400
 #define MAX_TICKADJ		500LL		/* usecs */
 #define MAX_TICKADJ_SCALED \
@@ -263,8 +264,8 @@ static void ntp_update_frequency(struct ntp_data *ntpdata)
 	 * Don't wait for the next second_overflow, apply the change to the
 	 * tick length immediately:
 	 */
-	tick_length		+= new_base - tick_length_base;
-	tick_length_base	 = new_base;
+	ntpdata->tick_length		+= new_base - ntpdata->tick_length_base;
+	ntpdata->tick_length_base	 = new_base;
 }
 
 static inline s64 ntp_update_offset_fll(s64 offset64, long secs)
@@ -341,8 +342,8 @@ static void __ntp_clear(struct ntp_data *ntpdata)
 
 	ntp_update_frequency(ntpdata);
 
-	tick_length	= tick_length_base;
-	time_offset	= 0;
+	ntpdata->tick_length	= ntpdata->tick_length_base;
+	time_offset		= 0;
 
 	ntp_next_leap_sec = TIME64_MAX;
 	/* Clear PPS state variables */
@@ -360,7 +361,7 @@ void ntp_clear(void)
 
 u64 ntp_tick_length(void)
 {
-	return tick_length;
+	return tk_ntp_data.tick_length;
 }
 
 /**
@@ -391,6 +392,7 @@ ktime_t ntp_get_next_leap(void)
  */
 int second_overflow(time64_t secs)
 {
+	struct ntp_data *ntpdata = &tk_ntp_data;
 	s64 delta;
 	int leap = 0;
 	s32 rem;
@@ -451,11 +453,11 @@ int second_overflow(time64_t secs)
 	}
 
 	/* Compute the phase adjustment for the next second */
-	tick_length	 = tick_length_base;
+	ntpdata->tick_length	 = ntpdata->tick_length_base;
 
-	delta		 = ntp_offset_chunk(time_offset);
-	time_offset	-= delta;
-	tick_length	+= delta;
+	delta			 = ntp_offset_chunk(time_offset);
+	time_offset		-= delta;
+	ntpdata->tick_length	+= delta;
 
 	/* Check PPS signal */
 	pps_dec_valid();
@@ -465,18 +467,18 @@ int second_overflow(time64_t secs)
 
 	if (time_adjust > MAX_TICKADJ) {
 		time_adjust -= MAX_TICKADJ;
-		tick_length += MAX_TICKADJ_SCALED;
+		ntpdata->tick_length += MAX_TICKADJ_SCALED;
 		goto out;
 	}
 
 	if (time_adjust < -MAX_TICKADJ) {
 		time_adjust += MAX_TICKADJ;
-		tick_length -= MAX_TICKADJ_SCALED;
+		ntpdata->tick_length -= MAX_TICKADJ_SCALED;
 		goto out;
 	}
 
-	tick_length += (s64)(time_adjust * NSEC_PER_USEC / NTP_INTERVAL_FREQ)
-							 << NTP_SCALE_SHIFT;
+	ntpdata->tick_length += (s64)(time_adjust * NSEC_PER_USEC / NTP_INTERVAL_FREQ)
+				<< NTP_SCALE_SHIFT;
 	time_adjust = 0;
 
 out:

-- 
2.39.2

[PATCH 09/21] ntp: Move tick_stat* into ntp_data

[Anna-Maria Behnsen]

From: Thomas Gleixner <tglx@linutronix.de>

Continue the conversion from static variables to struct based data.

No functional change.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>
---
 kernel/time/ntp.c | 175 ++++++++++++++++++++++++++----------------------------
 1 file changed, 85 insertions(+), 90 deletions(-)

diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index 6c5f684328c8..6d87f9889b03 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -27,6 +27,8 @@
  * @tick_usec:		USER_HZ period in microseconds
  * @tick_length:	Adjusted tick length
  * @tick_length_base:	Base value for @tick_length
+ * @time_state:		State of the clock synchronization
+ * @time_status:	Clock status bits
  *
  * Protected by the timekeeping locks.
  */
@@ -34,10 +36,14 @@ struct ntp_data {
 	unsigned long		tick_usec;
 	u64			tick_length;
 	u64			tick_length_base;
+	int			time_state;
+	int			time_status;
 };
 
 static struct ntp_data tk_ntp_data = {
 	.tick_usec		= USER_TICK_USEC,
+	.time_state		= TIME_OK,
+	.time_status		= STA_UNSYNC,
 };
 
 #define SECS_PER_DAY		86400
@@ -53,16 +59,6 @@ static struct ntp_data tk_ntp_data = {
  * estimated error = NTP dispersion.
  */
 
-/*
- * clock synchronization status
- *
- * (TIME_ERROR prevents overwriting the CMOS clock)
- */
-static int			time_state = TIME_OK;
-
-/* clock status bits:							*/
-static int			time_status = STA_UNSYNC;
-
 /* time adjustment (nsecs):						*/
 static s64			time_offset;
 
@@ -127,9 +123,9 @@ static long pps_errcnt;		/* calibration errors */
  * PPS kernel consumer compensates the whole phase error immediately.
  * Otherwise, reduce the offset by a fixed factor times the time constant.
  */
-static inline s64 ntp_offset_chunk(s64 offset)
+static inline s64 ntp_offset_chunk(struct ntp_data *ntpdata, s64 offset)
 {
-	if (time_status & STA_PPSTIME && time_status & STA_PPSSIGNAL)
+	if (ntpdata->time_status & STA_PPSTIME && ntpdata->time_status & STA_PPSSIGNAL)
 		return offset;
 	else
 		return shift_right(offset, SHIFT_PLL + time_constant);
@@ -159,13 +155,13 @@ static inline void pps_clear(void)
  * Decrease pps_valid to indicate that another second has passed since the
  * last PPS signal. When it reaches 0, indicate that PPS signal is missing.
  */
-static inline void pps_dec_valid(void)
+static inline void pps_dec_valid(struct ntp_data *ntpdata)
 {
 	if (pps_valid > 0)
 		pps_valid--;
 	else {
-		time_status &= ~(STA_PPSSIGNAL | STA_PPSJITTER |
-				 STA_PPSWANDER | STA_PPSERROR);
+		ntpdata->time_status &= ~(STA_PPSSIGNAL | STA_PPSJITTER |
+					  STA_PPSWANDER | STA_PPSERROR);
 		pps_clear();
 	}
 }
@@ -198,12 +194,12 @@ static inline bool is_error_status(int status)
 			&& (status & (STA_PPSWANDER|STA_PPSERROR)));
 }
 
-static inline void pps_fill_timex(struct __kernel_timex *txc)
+static inline void pps_fill_timex(struct ntp_data *ntpdata, struct __kernel_timex *txc)
 {
 	txc->ppsfreq	   = shift_right((pps_freq >> PPM_SCALE_INV_SHIFT) *
 					 PPM_SCALE_INV, NTP_SCALE_SHIFT);
 	txc->jitter	   = pps_jitter;
-	if (!(time_status & STA_NANO))
+	if (!(ntpdata->time_status & STA_NANO))
 		txc->jitter = pps_jitter / NSEC_PER_USEC;
 	txc->shift	   = pps_shift;
 	txc->stabil	   = pps_stabil;
@@ -215,14 +211,14 @@ static inline void pps_fill_timex(struct __kernel_timex *txc)
 
 #else /* !CONFIG_NTP_PPS */
 
-static inline s64 ntp_offset_chunk(s64 offset)
+static inline s64 ntp_offset_chunk(struct ntp_data *ntp, s64 offset)
 {
 	return shift_right(offset, SHIFT_PLL + time_constant);
 }
 
 static inline void pps_reset_freq_interval(void) {}
 static inline void pps_clear(void) {}
-static inline void pps_dec_valid(void) {}
+static inline void pps_dec_valid(struct ntp_data *ntpdata) {}
 static inline void pps_set_freq(s64 freq) {}
 
 static inline bool is_error_status(int status)
@@ -230,7 +226,7 @@ static inline bool is_error_status(int status)
 	return status & (STA_UNSYNC|STA_CLOCKERR);
 }
 
-static inline void pps_fill_timex(struct __kernel_timex *txc)
+static inline void pps_fill_timex(struct ntp_data *ntpdata, struct __kernel_timex *txc)
 {
 	/* PPS is not implemented, so these are zero */
 	txc->ppsfreq	   = 0;
@@ -268,30 +264,30 @@ static void ntp_update_frequency(struct ntp_data *ntpdata)
 	ntpdata->tick_length_base	 = new_base;
 }
 
-static inline s64 ntp_update_offset_fll(s64 offset64, long secs)
+static inline s64 ntp_update_offset_fll(struct ntp_data *ntpdata, s64 offset64, long secs)
 {
-	time_status &= ~STA_MODE;
+	ntpdata->time_status &= ~STA_MODE;
 
 	if (secs < MINSEC)
 		return 0;
 
-	if (!(time_status & STA_FLL) && (secs <= MAXSEC))
+	if (!(ntpdata->time_status & STA_FLL) && (secs <= MAXSEC))
 		return 0;
 
-	time_status |= STA_MODE;
+	ntpdata->time_status |= STA_MODE;
 
 	return div64_long(offset64 << (NTP_SCALE_SHIFT - SHIFT_FLL), secs);
 }
 
-static void ntp_update_offset(long offset)
+static void ntp_update_offset(struct ntp_data *ntpdata, long offset)
 {
 	s64 freq_adj, offset64;
 	long secs, real_secs;
 
-	if (!(time_status & STA_PLL))
+	if (!(ntpdata->time_status & STA_PLL))
 		return;
 
-	if (!(time_status & STA_NANO)) {
+	if (!(ntpdata->time_status & STA_NANO)) {
 		/* Make sure the multiplication below won't overflow */
 		offset = clamp(offset, -USEC_PER_SEC, USEC_PER_SEC);
 		offset *= NSEC_PER_USEC;
@@ -306,13 +302,13 @@ static void ntp_update_offset(long offset)
 	 */
 	real_secs = __ktime_get_real_seconds();
 	secs = (long)(real_secs - time_reftime);
-	if (unlikely(time_status & STA_FREQHOLD))
+	if (unlikely(ntpdata->time_status & STA_FREQHOLD))
 		secs = 0;
 
 	time_reftime = real_secs;
 
 	offset64    = offset;
-	freq_adj    = ntp_update_offset_fll(offset64, secs);
+	freq_adj    = ntp_update_offset_fll(ntpdata, offset64, secs);
 
 	/*
 	 * Clamp update interval to reduce PLL gain with low
@@ -335,10 +331,10 @@ static void ntp_update_offset(long offset)
 static void __ntp_clear(struct ntp_data *ntpdata)
 {
 	/* Stop active adjtime() */
-	time_adjust	= 0;
-	time_status	|= STA_UNSYNC;
-	time_maxerror	= NTP_PHASE_LIMIT;
-	time_esterror	= NTP_PHASE_LIMIT;
+	time_adjust		= 0;
+	ntpdata->time_status	|= STA_UNSYNC;
+	time_maxerror		= NTP_PHASE_LIMIT;
+	time_esterror		= NTP_PHASE_LIMIT;
 
 	ntp_update_frequency(ntpdata);
 
@@ -372,9 +368,10 @@ u64 ntp_tick_length(void)
  */
 ktime_t ntp_get_next_leap(void)
 {
+	struct ntp_data *ntpdata = &tk_ntp_data;
 	ktime_t ret;
 
-	if ((time_state == TIME_INS) && (time_status & STA_INS))
+	if ((ntpdata->time_state == TIME_INS) && (ntpdata->time_status & STA_INS))
 		return ktime_set(ntp_next_leap_sec, 0);
 	ret = KTIME_MAX;
 	return ret;
@@ -402,46 +399,46 @@ int second_overflow(time64_t secs)
 	 * day, the system clock is set back one second; if in leap-delete
 	 * state, the system clock is set ahead one second.
 	 */
-	switch (time_state) {
+	switch (ntpdata->time_state) {
 	case TIME_OK:
-		if (time_status & STA_INS) {
-			time_state = TIME_INS;
+		if (ntpdata->time_status & STA_INS) {
+			ntpdata->time_state = TIME_INS;
 			div_s64_rem(secs, SECS_PER_DAY, &rem);
 			ntp_next_leap_sec = secs + SECS_PER_DAY - rem;
-		} else if (time_status & STA_DEL) {
-			time_state = TIME_DEL;
+		} else if (ntpdata->time_status & STA_DEL) {
+			ntpdata->time_state = TIME_DEL;
 			div_s64_rem(secs + 1, SECS_PER_DAY, &rem);
 			ntp_next_leap_sec = secs + SECS_PER_DAY - rem;
 		}
 		break;
 	case TIME_INS:
-		if (!(time_status & STA_INS)) {
+		if (!(ntpdata->time_status & STA_INS)) {
 			ntp_next_leap_sec = TIME64_MAX;
-			time_state = TIME_OK;
+			ntpdata->time_state = TIME_OK;
 		} else if (secs == ntp_next_leap_sec) {
 			leap = -1;
-			time_state = TIME_OOP;
+			ntpdata->time_state = TIME_OOP;
 			pr_notice("Clock: inserting leap second 23:59:60 UTC\n");
 		}
 		break;
 	case TIME_DEL:
-		if (!(time_status & STA_DEL)) {
+		if (!(ntpdata->time_status & STA_DEL)) {
 			ntp_next_leap_sec = TIME64_MAX;
-			time_state = TIME_OK;
+			ntpdata->time_state = TIME_OK;
 		} else if (secs == ntp_next_leap_sec) {
 			leap = 1;
 			ntp_next_leap_sec = TIME64_MAX;
-			time_state = TIME_WAIT;
+			ntpdata->time_state = TIME_WAIT;
 			pr_notice("Clock: deleting leap second 23:59:59 UTC\n");
 		}
 		break;
 	case TIME_OOP:
 		ntp_next_leap_sec = TIME64_MAX;
-		time_state = TIME_WAIT;
+		ntpdata->time_state = TIME_WAIT;
 		break;
 	case TIME_WAIT:
-		if (!(time_status & (STA_INS | STA_DEL)))
-			time_state = TIME_OK;
+		if (!(ntpdata->time_status & (STA_INS | STA_DEL)))
+			ntpdata->time_state = TIME_OK;
 		break;
 	}
 
@@ -449,18 +446,18 @@ int second_overflow(time64_t secs)
 	time_maxerror += MAXFREQ / NSEC_PER_USEC;
 	if (time_maxerror > NTP_PHASE_LIMIT) {
 		time_maxerror = NTP_PHASE_LIMIT;
-		time_status |= STA_UNSYNC;
+		ntpdata->time_status |= STA_UNSYNC;
 	}
 
 	/* Compute the phase adjustment for the next second */
 	ntpdata->tick_length	 = ntpdata->tick_length_base;
 
-	delta			 = ntp_offset_chunk(time_offset);
+	delta			 = ntp_offset_chunk(ntpdata, time_offset);
 	time_offset		-= delta;
 	ntpdata->tick_length	+= delta;
 
 	/* Check PPS signal */
-	pps_dec_valid();
+	pps_dec_valid(ntpdata);
 
 	if (!time_adjust)
 		goto out;
@@ -608,7 +605,7 @@ static inline int update_rtc(struct timespec64 *to_set, unsigned long *offset_ns
  */
 static inline bool ntp_synced(void)
 {
-	return !(time_status & STA_UNSYNC);
+	return !(tk_ntp_data.time_status & STA_UNSYNC);
 }
 
 /*
@@ -683,11 +680,11 @@ static inline void __init ntp_init_cmos_sync(void) { }
 /*
  * Propagate a new txc->status value into the NTP state:
  */
-static inline void process_adj_status(const struct __kernel_timex *txc)
+static inline void process_adj_status(struct ntp_data *ntpdata, const struct __kernel_timex *txc)
 {
-	if ((time_status & STA_PLL) && !(txc->status & STA_PLL)) {
-		time_state = TIME_OK;
-		time_status = STA_UNSYNC;
+	if ((ntpdata->time_status & STA_PLL) && !(txc->status & STA_PLL)) {
+		ntpdata->time_state = TIME_OK;
+		ntpdata->time_status = STA_UNSYNC;
 		ntp_next_leap_sec = TIME64_MAX;
 		/* Restart PPS frequency calibration */
 		pps_reset_freq_interval();
@@ -697,26 +694,25 @@ static inline void process_adj_status(const struct __kernel_timex *txc)
 	 * If we turn on PLL adjustments then reset the
 	 * reference time to current time.
 	 */
-	if (!(time_status & STA_PLL) && (txc->status & STA_PLL))
+	if (!(ntpdata->time_status & STA_PLL) && (txc->status & STA_PLL))
 		time_reftime = __ktime_get_real_seconds();
 
-	/* Only set allowed bits */
-	time_status &= STA_RONLY;
-	time_status |= txc->status & ~STA_RONLY;
+	/* only set allowed bits */
+	ntpdata->time_status &= STA_RONLY;
+	ntpdata->time_status |= txc->status & ~STA_RONLY;
 }
 
-
 static inline void process_adjtimex_modes(struct ntp_data *ntpdata, const struct __kernel_timex *txc,
 					  s32 *time_tai)
 {
 	if (txc->modes & ADJ_STATUS)
-		process_adj_status(txc);
+		process_adj_status(ntpdata, txc);
 
 	if (txc->modes & ADJ_NANO)
-		time_status |= STA_NANO;
+		ntpdata->time_status |= STA_NANO;
 
 	if (txc->modes & ADJ_MICRO)
-		time_status &= ~STA_NANO;
+		ntpdata->time_status &= ~STA_NANO;
 
 	if (txc->modes & ADJ_FREQUENCY) {
 		time_freq = txc->freq * PPM_SCALE;
@@ -734,17 +730,16 @@ static inline void process_adjtimex_modes(struct ntp_data *ntpdata, const struct
 
 	if (txc->modes & ADJ_TIMECONST) {
 		time_constant = clamp(txc->constant, 0, MAXTC);
-		if (!(time_status & STA_NANO))
+		if (!(ntpdata->time_status & STA_NANO))
 			time_constant += 4;
 		time_constant = clamp(time_constant, 0, MAXTC);
 	}
 
-	if (txc->modes & ADJ_TAI &&
-			txc->constant >= 0 && txc->constant <= MAX_TAI_OFFSET)
+	if (txc->modes & ADJ_TAI && txc->constant >= 0 && txc->constant <= MAX_TAI_OFFSET)
 		*time_tai = txc->constant;
 
 	if (txc->modes & ADJ_OFFSET)
-		ntp_update_offset(txc->offset);
+		ntp_update_offset(ntpdata, txc->offset);
 
 	if (txc->modes & ADJ_TICK)
 		ntpdata->tick_usec = txc->tick;
@@ -780,7 +775,7 @@ int __do_adjtimex(struct __kernel_timex *txc, const struct timespec64 *ts,
 		if (txc->modes) {
 			audit_ntp_set_old(ad, AUDIT_NTP_OFFSET,	time_offset);
 			audit_ntp_set_old(ad, AUDIT_NTP_FREQ,	time_freq);
-			audit_ntp_set_old(ad, AUDIT_NTP_STATUS,	time_status);
+			audit_ntp_set_old(ad, AUDIT_NTP_STATUS,	ntpdata->time_status);
 			audit_ntp_set_old(ad, AUDIT_NTP_TAI,	*time_tai);
 			audit_ntp_set_old(ad, AUDIT_NTP_TICK,	ntpdata->tick_usec);
 
@@ -788,26 +783,26 @@ int __do_adjtimex(struct __kernel_timex *txc, const struct timespec64 *ts,
 
 			audit_ntp_set_new(ad, AUDIT_NTP_OFFSET,	time_offset);
 			audit_ntp_set_new(ad, AUDIT_NTP_FREQ,	time_freq);
-			audit_ntp_set_new(ad, AUDIT_NTP_STATUS,	time_status);
+			audit_ntp_set_new(ad, AUDIT_NTP_STATUS,	ntpdata->time_status);
 			audit_ntp_set_new(ad, AUDIT_NTP_TAI,	*time_tai);
 			audit_ntp_set_new(ad, AUDIT_NTP_TICK,	ntpdata->tick_usec);
 		}
 
 		txc->offset = shift_right(time_offset * NTP_INTERVAL_FREQ,
 				  NTP_SCALE_SHIFT);
-		if (!(time_status & STA_NANO))
+		if (!(ntpdata->time_status & STA_NANO))
 			txc->offset = (u32)txc->offset / NSEC_PER_USEC;
 	}
 
-	result = time_state;
-	if (is_error_status(time_status))
+	result = ntpdata->time_state;
+	if (is_error_status(ntpdata->time_status))
 		result = TIME_ERROR;
 
 	txc->freq	   = shift_right((time_freq >> PPM_SCALE_INV_SHIFT) *
 					 PPM_SCALE_INV, NTP_SCALE_SHIFT);
 	txc->maxerror	   = time_maxerror;
 	txc->esterror	   = time_esterror;
-	txc->status	   = time_status;
+	txc->status	   = ntpdata->time_status;
 	txc->constant	   = time_constant;
 	txc->precision	   = 1;
 	txc->tolerance	   = MAXFREQ_SCALED / PPM_SCALE;
@@ -815,26 +810,26 @@ int __do_adjtimex(struct __kernel_timex *txc, const struct timespec64 *ts,
 	txc->tai	   = *time_tai;
 
 	/* Fill PPS status fields */
-	pps_fill_timex(txc);
+	pps_fill_timex(ntpdata, txc);
 
 	txc->time.tv_sec = ts->tv_sec;
 	txc->time.tv_usec = ts->tv_nsec;
-	if (!(time_status & STA_NANO))
+	if (!(ntpdata->time_status & STA_NANO))
 		txc->time.tv_usec = ts->tv_nsec / NSEC_PER_USEC;
 
 	/* Handle leapsec adjustments */
 	if (unlikely(ts->tv_sec >= ntp_next_leap_sec)) {
-		if ((time_state == TIME_INS) && (time_status & STA_INS)) {
+		if ((ntpdata->time_state == TIME_INS) && (ntpdata->time_status & STA_INS)) {
 			result = TIME_OOP;
 			txc->tai++;
 			txc->time.tv_sec--;
 		}
-		if ((time_state == TIME_DEL) && (time_status & STA_DEL)) {
+		if ((ntpdata->time_state == TIME_DEL) && (ntpdata->time_status & STA_DEL)) {
 			result = TIME_WAIT;
 			txc->tai--;
 			txc->time.tv_sec++;
 		}
-		if ((time_state == TIME_OOP) &&	(ts->tv_sec == ntp_next_leap_sec))
+		if ((ntpdata->time_state == TIME_OOP) && (ts->tv_sec == ntp_next_leap_sec))
 			result = TIME_WAIT;
 	}
 
@@ -939,7 +934,7 @@ static long hardpps_update_freq(struct ntp_data *ntpdata, struct pps_normtime fr
 
 	/* Check if the frequency interval was too long */
 	if (freq_norm.sec > (2 << pps_shift)) {
-		time_status |= STA_PPSERROR;
+		ntpdata->time_status |= STA_PPSERROR;
 		pps_errcnt++;
 		pps_dec_freq_interval();
 		printk_deferred(KERN_ERR "hardpps: PPSERROR: interval too long - %lld s\n",
@@ -958,7 +953,7 @@ static long hardpps_update_freq(struct ntp_data *ntpdata, struct pps_normtime fr
 	pps_freq = ftemp;
 	if (delta > PPS_MAXWANDER || delta < -PPS_MAXWANDER) {
 		printk_deferred(KERN_WARNING "hardpps: PPSWANDER: change=%ld\n", delta);
-		time_status |= STA_PPSWANDER;
+		ntpdata->time_status |= STA_PPSWANDER;
 		pps_stbcnt++;
 		pps_dec_freq_interval();
 	} else {
@@ -977,7 +972,7 @@ static long hardpps_update_freq(struct ntp_data *ntpdata, struct pps_normtime fr
 			       NSEC_PER_USEC) - pps_stabil) >> PPS_INTMIN;
 
 	/* If enabled, the system clock frequency is updated */
-	if ((time_status & STA_PPSFREQ) && !(time_status & STA_FREQHOLD)) {
+	if ((ntpdata->time_status & STA_PPSFREQ) && !(ntpdata->time_status & STA_FREQHOLD)) {
 		time_freq = pps_freq;
 		ntp_update_frequency(ntpdata);
 	}
@@ -986,7 +981,7 @@ static long hardpps_update_freq(struct ntp_data *ntpdata, struct pps_normtime fr
 }
 
 /* Correct REALTIME clock phase error against PPS signal */
-static void hardpps_update_phase(long error)
+static void hardpps_update_phase(struct ntp_data *ntpdata, long error)
 {
 	long correction = -error;
 	long jitter;
@@ -1003,9 +998,9 @@ static void hardpps_update_phase(long error)
 	if (jitter > (pps_jitter << PPS_POPCORN)) {
 		printk_deferred(KERN_WARNING "hardpps: PPSJITTER: jitter=%ld, limit=%ld\n",
 				jitter, (pps_jitter << PPS_POPCORN));
-		time_status |= STA_PPSJITTER;
+		ntpdata->time_status |= STA_PPSJITTER;
 		pps_jitcnt++;
-	} else if (time_status & STA_PPSTIME) {
+	} else if (ntpdata->time_status & STA_PPSTIME) {
 		/* Correct the time using the phase offset */
 		time_offset = div_s64(((s64)correction) << NTP_SCALE_SHIFT, NTP_INTERVAL_FREQ);
 		/* Cancel running adjtime() */
@@ -1035,10 +1030,10 @@ void __hardpps(const struct timespec64 *phase_ts, const struct timespec64 *raw_t
 	pts_norm = pps_normalize_ts(*phase_ts);
 
 	/* Clear the error bits, they will be set again if needed */
-	time_status &= ~(STA_PPSJITTER | STA_PPSWANDER | STA_PPSERROR);
+	ntpdata->time_status &= ~(STA_PPSJITTER | STA_PPSWANDER | STA_PPSERROR);
 
-	/* Indicate signal presence */
-	time_status |= STA_PPSSIGNAL;
+	/* indicate signal presence */
+	ntpdata->time_status |= STA_PPSSIGNAL;
 	pps_valid = PPS_VALID;
 
 	/*
@@ -1059,7 +1054,7 @@ void __hardpps(const struct timespec64 *phase_ts, const struct timespec64 *raw_t
 	 */
 	if ((freq_norm.sec == 0) || (freq_norm.nsec > MAXFREQ * freq_norm.sec) ||
 	    (freq_norm.nsec < -MAXFREQ * freq_norm.sec)) {
-		time_status |= STA_PPSJITTER;
+		ntpdata->time_status |= STA_PPSJITTER;
 		/* Restart the frequency calibration interval */
 		pps_fbase = *raw_ts;
 		printk_deferred(KERN_ERR "hardpps: PPSJITTER: bad pulse\n");
@@ -1074,7 +1069,7 @@ void __hardpps(const struct timespec64 *phase_ts, const struct timespec64 *raw_t
 		hardpps_update_freq(ntpdata, freq_norm);
 	}
 
-	hardpps_update_phase(pts_norm.nsec);
+	hardpps_update_phase(ntpdata, pts_norm.nsec);
 
 }
 #endif	/* CONFIG_NTP_PPS */

-- 
2.39.2

[PATCH 10/21] ntp: Move time_offset/constant into ntp_data

[Anna-Maria Behnsen]

From: Thomas Gleixner <tglx@linutronix.de>

Continue the conversion from static variables to struct based data.

No functional change.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>
---
 kernel/time/ntp.c | 49 ++++++++++++++++++++++++-------------------------
 1 file changed, 24 insertions(+), 25 deletions(-)

diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index 6d87f9889b03..ffe65b0d0a5e 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -29,6 +29,8 @@
  * @tick_length_base:	Base value for @tick_length
  * @time_state:		State of the clock synchronization
  * @time_status:	Clock status bits
+ * @time_offset:	Time adjustment in nanoseconds
+ * @time_constant:	PLL time constant
  *
  * Protected by the timekeeping locks.
  */
@@ -38,12 +40,15 @@ struct ntp_data {
 	u64			tick_length_base;
 	int			time_state;
 	int			time_status;
+	s64			time_offset;
+	long			time_constant;
 };
 
 static struct ntp_data tk_ntp_data = {
 	.tick_usec		= USER_TICK_USEC,
 	.time_state		= TIME_OK,
 	.time_status		= STA_UNSYNC,
+	.time_constant		= 2,
 };
 
 #define SECS_PER_DAY		86400
@@ -59,12 +64,6 @@ static struct ntp_data tk_ntp_data = {
  * estimated error = NTP dispersion.
  */
 
-/* time adjustment (nsecs):						*/
-static s64			time_offset;
-
-/* pll time constant:							*/
-static long			time_constant = 2;
-
 /* maximum error (usecs):						*/
 static long			time_maxerror = NTP_PHASE_LIMIT;
 
@@ -128,7 +127,7 @@ static inline s64 ntp_offset_chunk(struct ntp_data *ntpdata, s64 offset)
 	if (ntpdata->time_status & STA_PPSTIME && ntpdata->time_status & STA_PPSSIGNAL)
 		return offset;
 	else
-		return shift_right(offset, SHIFT_PLL + time_constant);
+		return shift_right(offset, SHIFT_PLL + ntpdata->time_constant);
 }
 
 static inline void pps_reset_freq_interval(void)
@@ -211,9 +210,9 @@ static inline void pps_fill_timex(struct ntp_data *ntpdata, struct __kernel_time
 
 #else /* !CONFIG_NTP_PPS */
 
-static inline s64 ntp_offset_chunk(struct ntp_data *ntp, s64 offset)
+static inline s64 ntp_offset_chunk(struct ntp_data *ntpdata, s64 offset)
 {
-	return shift_right(offset, SHIFT_PLL + time_constant);
+	return shift_right(offset, SHIFT_PLL + ntpdata->time_constant);
 }
 
 static inline void pps_reset_freq_interval(void) {}
@@ -315,17 +314,17 @@ static void ntp_update_offset(struct ntp_data *ntpdata, long offset)
 	 * sampling rate (e.g. intermittent network connection)
 	 * to avoid instability.
 	 */
-	if (unlikely(secs > 1 << (SHIFT_PLL + 1 + time_constant)))
-		secs = 1 << (SHIFT_PLL + 1 + time_constant);
+	if (unlikely(secs > 1 << (SHIFT_PLL + 1 + ntpdata->time_constant)))
+		secs = 1 << (SHIFT_PLL + 1 + ntpdata->time_constant);
 
 	freq_adj    += (offset64 * secs) <<
-			(NTP_SCALE_SHIFT - 2 * (SHIFT_PLL + 2 + time_constant));
+			(NTP_SCALE_SHIFT - 2 * (SHIFT_PLL + 2 + ntpdata->time_constant));
 
 	freq_adj    = min(freq_adj + time_freq, MAXFREQ_SCALED);
 
 	time_freq   = max(freq_adj, -MAXFREQ_SCALED);
 
-	time_offset = div_s64(offset64 << NTP_SCALE_SHIFT, NTP_INTERVAL_FREQ);
+	ntpdata->time_offset = div_s64(offset64 << NTP_SCALE_SHIFT, NTP_INTERVAL_FREQ);
 }
 
 static void __ntp_clear(struct ntp_data *ntpdata)
@@ -339,7 +338,7 @@ static void __ntp_clear(struct ntp_data *ntpdata)
 	ntp_update_frequency(ntpdata);
 
 	ntpdata->tick_length	= ntpdata->tick_length_base;
-	time_offset		= 0;
+	ntpdata->time_offset	= 0;
 
 	ntp_next_leap_sec = TIME64_MAX;
 	/* Clear PPS state variables */
@@ -452,8 +451,8 @@ int second_overflow(time64_t secs)
 	/* Compute the phase adjustment for the next second */
 	ntpdata->tick_length	 = ntpdata->tick_length_base;
 
-	delta			 = ntp_offset_chunk(ntpdata, time_offset);
-	time_offset		-= delta;
+	delta			 = ntp_offset_chunk(ntpdata, ntpdata->time_offset);
+	ntpdata->time_offset	-= delta;
 	ntpdata->tick_length	+= delta;
 
 	/* Check PPS signal */
@@ -729,10 +728,10 @@ static inline void process_adjtimex_modes(struct ntp_data *ntpdata, const struct
 		time_esterror = clamp(txc->esterror, 0, NTP_PHASE_LIMIT);
 
 	if (txc->modes & ADJ_TIMECONST) {
-		time_constant = clamp(txc->constant, 0, MAXTC);
+		ntpdata->time_constant = clamp(txc->constant, 0, MAXTC);
 		if (!(ntpdata->time_status & STA_NANO))
-			time_constant += 4;
-		time_constant = clamp(time_constant, 0, MAXTC);
+			ntpdata->time_constant += 4;
+		ntpdata->time_constant = clamp(ntpdata->time_constant, 0, MAXTC);
 	}
 
 	if (txc->modes & ADJ_TAI && txc->constant >= 0 && txc->constant <= MAX_TAI_OFFSET)
@@ -773,7 +772,7 @@ int __do_adjtimex(struct __kernel_timex *txc, const struct timespec64 *ts,
 	} else {
 		/* If there are input parameters, then process them: */
 		if (txc->modes) {
-			audit_ntp_set_old(ad, AUDIT_NTP_OFFSET,	time_offset);
+			audit_ntp_set_old(ad, AUDIT_NTP_OFFSET,	ntpdata->time_offset);
 			audit_ntp_set_old(ad, AUDIT_NTP_FREQ,	time_freq);
 			audit_ntp_set_old(ad, AUDIT_NTP_STATUS,	ntpdata->time_status);
 			audit_ntp_set_old(ad, AUDIT_NTP_TAI,	*time_tai);
@@ -781,15 +780,14 @@ int __do_adjtimex(struct __kernel_timex *txc, const struct timespec64 *ts,
 
 			process_adjtimex_modes(ntpdata, txc, time_tai);
 
-			audit_ntp_set_new(ad, AUDIT_NTP_OFFSET,	time_offset);
+			audit_ntp_set_new(ad, AUDIT_NTP_OFFSET,	ntpdata->time_offset);
 			audit_ntp_set_new(ad, AUDIT_NTP_FREQ,	time_freq);
 			audit_ntp_set_new(ad, AUDIT_NTP_STATUS,	ntpdata->time_status);
 			audit_ntp_set_new(ad, AUDIT_NTP_TAI,	*time_tai);
 			audit_ntp_set_new(ad, AUDIT_NTP_TICK,	ntpdata->tick_usec);
 		}
 
-		txc->offset = shift_right(time_offset * NTP_INTERVAL_FREQ,
-				  NTP_SCALE_SHIFT);
+		txc->offset = shift_right(ntpdata->time_offset * NTP_INTERVAL_FREQ, NTP_SCALE_SHIFT);
 		if (!(ntpdata->time_status & STA_NANO))
 			txc->offset = (u32)txc->offset / NSEC_PER_USEC;
 	}
@@ -803,7 +801,7 @@ int __do_adjtimex(struct __kernel_timex *txc, const struct timespec64 *ts,
 	txc->maxerror	   = time_maxerror;
 	txc->esterror	   = time_esterror;
 	txc->status	   = ntpdata->time_status;
-	txc->constant	   = time_constant;
+	txc->constant	   = ntpdata->time_constant;
 	txc->precision	   = 1;
 	txc->tolerance	   = MAXFREQ_SCALED / PPM_SCALE;
 	txc->tick	   = ntpdata->tick_usec;
@@ -1002,7 +1000,8 @@ static void hardpps_update_phase(struct ntp_data *ntpdata, long error)
 		pps_jitcnt++;
 	} else if (ntpdata->time_status & STA_PPSTIME) {
 		/* Correct the time using the phase offset */
-		time_offset = div_s64(((s64)correction) << NTP_SCALE_SHIFT, NTP_INTERVAL_FREQ);
+		ntpdata->time_offset = div_s64(((s64)correction) << NTP_SCALE_SHIFT,
+					       NTP_INTERVAL_FREQ);
 		/* Cancel running adjtime() */
 		time_adjust = 0;
 	}

-- 
2.39.2

[PATCH 11/21] ntp: Move time_max/esterror into ntp_data

[Anna-Maria Behnsen]

From: Thomas Gleixner <tglx@linutronix.de>

Continue the conversion from static variables to struct based data.

No functional change.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>
---
 kernel/time/ntp.c | 38 ++++++++++++++++----------------------
 1 file changed, 16 insertions(+), 22 deletions(-)

diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index ffe65b0d0a5e..15708ac4d0fb 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -31,6 +31,9 @@
  * @time_status:	Clock status bits
  * @time_offset:	Time adjustment in nanoseconds
  * @time_constant:	PLL time constant
+ * @time_maxerror:	Maximum error in microseconds holding the NTP sync distance
+ *			(NTP dispersion + delay / 2)
+ * @time_esterror:	Estimated error in microseconds holding NTP dispersion
  *
  * Protected by the timekeeping locks.
  */
@@ -42,6 +45,8 @@ struct ntp_data {
 	int			time_status;
 	s64			time_offset;
 	long			time_constant;
+	long			time_maxerror;
+	long			time_esterror;
 };
 
 static struct ntp_data tk_ntp_data = {
@@ -49,6 +54,8 @@ static struct ntp_data tk_ntp_data = {
 	.time_state		= TIME_OK,
 	.time_status		= STA_UNSYNC,
 	.time_constant		= 2,
+	.time_maxerror		= NTP_PHASE_LIMIT,
+	.time_esterror		= NTP_PHASE_LIMIT,
 };
 
 #define SECS_PER_DAY		86400
@@ -57,19 +64,6 @@ static struct ntp_data tk_ntp_data = {
 	(((MAX_TICKADJ * NSEC_PER_USEC) << NTP_SCALE_SHIFT) / NTP_INTERVAL_FREQ)
 #define MAX_TAI_OFFSET		100000
 
-/*
- * phase-lock loop variables
- *
- * Note: maximum error = NTP sync distance = dispersion + delay / 2;
- * estimated error = NTP dispersion.
- */
-
-/* maximum error (usecs):						*/
-static long			time_maxerror = NTP_PHASE_LIMIT;
-
-/* estimated error (usecs):						*/
-static long			time_esterror = NTP_PHASE_LIMIT;
-
 /* frequency offset (scaled nsecs/secs):				*/
 static s64			time_freq;
 
@@ -332,8 +326,8 @@ static void __ntp_clear(struct ntp_data *ntpdata)
 	/* Stop active adjtime() */
 	time_adjust		= 0;
 	ntpdata->time_status	|= STA_UNSYNC;
-	time_maxerror		= NTP_PHASE_LIMIT;
-	time_esterror		= NTP_PHASE_LIMIT;
+	ntpdata->time_maxerror	= NTP_PHASE_LIMIT;
+	ntpdata->time_esterror	= NTP_PHASE_LIMIT;
 
 	ntp_update_frequency(ntpdata);
 
@@ -442,9 +436,9 @@ int second_overflow(time64_t secs)
 	}
 
 	/* Bump the maxerror field */
-	time_maxerror += MAXFREQ / NSEC_PER_USEC;
-	if (time_maxerror > NTP_PHASE_LIMIT) {
-		time_maxerror = NTP_PHASE_LIMIT;
+	ntpdata->time_maxerror += MAXFREQ / NSEC_PER_USEC;
+	if (ntpdata->time_maxerror > NTP_PHASE_LIMIT) {
+		ntpdata->time_maxerror = NTP_PHASE_LIMIT;
 		ntpdata->time_status |= STA_UNSYNC;
 	}
 
@@ -722,10 +716,10 @@ static inline void process_adjtimex_modes(struct ntp_data *ntpdata, const struct
 	}
 
 	if (txc->modes & ADJ_MAXERROR)
-		time_maxerror = clamp(txc->maxerror, 0, NTP_PHASE_LIMIT);
+		ntpdata->time_maxerror = clamp(txc->maxerror, 0, NTP_PHASE_LIMIT);
 
 	if (txc->modes & ADJ_ESTERROR)
-		time_esterror = clamp(txc->esterror, 0, NTP_PHASE_LIMIT);
+		ntpdata->time_esterror = clamp(txc->esterror, 0, NTP_PHASE_LIMIT);
 
 	if (txc->modes & ADJ_TIMECONST) {
 		ntpdata->time_constant = clamp(txc->constant, 0, MAXTC);
@@ -798,8 +792,8 @@ int __do_adjtimex(struct __kernel_timex *txc, const struct timespec64 *ts,
 
 	txc->freq	   = shift_right((time_freq >> PPM_SCALE_INV_SHIFT) *
 					 PPM_SCALE_INV, NTP_SCALE_SHIFT);
-	txc->maxerror	   = time_maxerror;
-	txc->esterror	   = time_esterror;
+	txc->maxerror	   = ntpdata->time_maxerror;
+	txc->esterror	   = ntpdata->time_esterror;
 	txc->status	   = ntpdata->time_status;
 	txc->constant	   = ntpdata->time_constant;
 	txc->precision	   = 1;

-- 
2.39.2

[PATCH 12/21] ntp: Move time_freq/reftime into ntp_data

[Anna-Maria Behnsen]

From: Thomas Gleixner <tglx@linutronix.de>

Continue the conversion from static variables to struct based data.

No functional change.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>
---
 kernel/time/ntp.c | 38 ++++++++++++++++++--------------------
 1 file changed, 18 insertions(+), 20 deletions(-)

diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index 15708ac4d0fb..47c4f3e3562c 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -34,6 +34,8 @@
  * @time_maxerror:	Maximum error in microseconds holding the NTP sync distance
  *			(NTP dispersion + delay / 2)
  * @time_esterror:	Estimated error in microseconds holding NTP dispersion
+ * @time_freq:		Frequency offset scaled nsecs/secs
+ * @time_reftime:	Time at last adjustment in seconds
  *
  * Protected by the timekeeping locks.
  */
@@ -47,6 +49,8 @@ struct ntp_data {
 	long			time_constant;
 	long			time_maxerror;
 	long			time_esterror;
+	s64			time_freq;
+	time64_t		time_reftime;
 };
 
 static struct ntp_data tk_ntp_data = {
@@ -64,12 +68,6 @@ static struct ntp_data tk_ntp_data = {
 	(((MAX_TICKADJ * NSEC_PER_USEC) << NTP_SCALE_SHIFT) / NTP_INTERVAL_FREQ)
 #define MAX_TAI_OFFSET		100000
 
-/* frequency offset (scaled nsecs/secs):				*/
-static s64			time_freq;
-
-/* time at last adjustment (secs):					*/
-static time64_t		time_reftime;
-
 static long			time_adjust;
 
 /* constant (boot-param configurable) NTP tick adjustment (upscaled)	*/
@@ -245,7 +243,7 @@ static void ntp_update_frequency(struct ntp_data *ntpdata)
 	second_length		 = (u64)(tick_usec * NSEC_PER_USEC * USER_HZ) << NTP_SCALE_SHIFT;
 
 	second_length		+= ntp_tick_adj;
-	second_length		+= time_freq;
+	second_length		+= ntpdata->time_freq;
 
 	new_base		 = div_u64(second_length, NTP_INTERVAL_FREQ);
 
@@ -294,11 +292,11 @@ static void ntp_update_offset(struct ntp_data *ntpdata, long offset)
 	 * and in which mode (PLL or FLL).
 	 */
 	real_secs = __ktime_get_real_seconds();
-	secs = (long)(real_secs - time_reftime);
+	secs = (long)(real_secs - ntpdata->time_reftime);
 	if (unlikely(ntpdata->time_status & STA_FREQHOLD))
 		secs = 0;
 
-	time_reftime = real_secs;
+	ntpdata->time_reftime = real_secs;
 
 	offset64    = offset;
 	freq_adj    = ntp_update_offset_fll(ntpdata, offset64, secs);
@@ -314,9 +312,9 @@ static void ntp_update_offset(struct ntp_data *ntpdata, long offset)
 	freq_adj    += (offset64 * secs) <<
 			(NTP_SCALE_SHIFT - 2 * (SHIFT_PLL + 2 + ntpdata->time_constant));
 
-	freq_adj    = min(freq_adj + time_freq, MAXFREQ_SCALED);
+	freq_adj    = min(freq_adj + ntpdata->time_freq, MAXFREQ_SCALED);
 
-	time_freq   = max(freq_adj, -MAXFREQ_SCALED);
+	ntpdata->time_freq   = max(freq_adj, -MAXFREQ_SCALED);
 
 	ntpdata->time_offset = div_s64(offset64 << NTP_SCALE_SHIFT, NTP_INTERVAL_FREQ);
 }
@@ -688,7 +686,7 @@ static inline void process_adj_status(struct ntp_data *ntpdata, const struct __k
 	 * reference time to current time.
 	 */
 	if (!(ntpdata->time_status & STA_PLL) && (txc->status & STA_PLL))
-		time_reftime = __ktime_get_real_seconds();
+		ntpdata->time_reftime = __ktime_get_real_seconds();
 
 	/* only set allowed bits */
 	ntpdata->time_status &= STA_RONLY;
@@ -708,11 +706,11 @@ static inline void process_adjtimex_modes(struct ntp_data *ntpdata, const struct
 		ntpdata->time_status &= ~STA_NANO;
 
 	if (txc->modes & ADJ_FREQUENCY) {
-		time_freq = txc->freq * PPM_SCALE;
-		time_freq = min(time_freq, MAXFREQ_SCALED);
-		time_freq = max(time_freq, -MAXFREQ_SCALED);
+		ntpdata->time_freq = txc->freq * PPM_SCALE;
+		ntpdata->time_freq = min(ntpdata->time_freq, MAXFREQ_SCALED);
+		ntpdata->time_freq = max(ntpdata->time_freq, -MAXFREQ_SCALED);
 		/* Update pps_freq */
-		pps_set_freq(time_freq);
+		pps_set_freq(ntpdata->time_freq);
 	}
 
 	if (txc->modes & ADJ_MAXERROR)
@@ -767,7 +765,7 @@ int __do_adjtimex(struct __kernel_timex *txc, const struct timespec64 *ts,
 		/* If there are input parameters, then process them: */
 		if (txc->modes) {
 			audit_ntp_set_old(ad, AUDIT_NTP_OFFSET,	ntpdata->time_offset);
-			audit_ntp_set_old(ad, AUDIT_NTP_FREQ,	time_freq);
+			audit_ntp_set_old(ad, AUDIT_NTP_FREQ,	ntpdata->time_freq);
 			audit_ntp_set_old(ad, AUDIT_NTP_STATUS,	ntpdata->time_status);
 			audit_ntp_set_old(ad, AUDIT_NTP_TAI,	*time_tai);
 			audit_ntp_set_old(ad, AUDIT_NTP_TICK,	ntpdata->tick_usec);
@@ -775,7 +773,7 @@ int __do_adjtimex(struct __kernel_timex *txc, const struct timespec64 *ts,
 			process_adjtimex_modes(ntpdata, txc, time_tai);
 
 			audit_ntp_set_new(ad, AUDIT_NTP_OFFSET,	ntpdata->time_offset);
-			audit_ntp_set_new(ad, AUDIT_NTP_FREQ,	time_freq);
+			audit_ntp_set_new(ad, AUDIT_NTP_FREQ,	ntpdata->time_freq);
 			audit_ntp_set_new(ad, AUDIT_NTP_STATUS,	ntpdata->time_status);
 			audit_ntp_set_new(ad, AUDIT_NTP_TAI,	*time_tai);
 			audit_ntp_set_new(ad, AUDIT_NTP_TICK,	ntpdata->tick_usec);
@@ -790,7 +788,7 @@ int __do_adjtimex(struct __kernel_timex *txc, const struct timespec64 *ts,
 	if (is_error_status(ntpdata->time_status))
 		result = TIME_ERROR;
 
-	txc->freq	   = shift_right((time_freq >> PPM_SCALE_INV_SHIFT) *
+	txc->freq	   = shift_right((ntpdata->time_freq >> PPM_SCALE_INV_SHIFT) *
 					 PPM_SCALE_INV, NTP_SCALE_SHIFT);
 	txc->maxerror	   = ntpdata->time_maxerror;
 	txc->esterror	   = ntpdata->time_esterror;
@@ -965,7 +963,7 @@ static long hardpps_update_freq(struct ntp_data *ntpdata, struct pps_normtime fr
 
 	/* If enabled, the system clock frequency is updated */
 	if ((ntpdata->time_status & STA_PPSFREQ) && !(ntpdata->time_status & STA_FREQHOLD)) {
-		time_freq = pps_freq;
+		ntpdata->time_freq = pps_freq;
 		ntp_update_frequency(ntpdata);
 	}
 

-- 
2.39.2

[PATCH 13/21] ntp: Move time_adj/ntp_tick_adj into ntp_data

[Anna-Maria Behnsen]

From: Thomas Gleixner <tglx@linutronix.de>

Continue the conversion from static variables to struct based data.

No functional change.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>
---
 kernel/time/ntp.c | 39 +++++++++++++++++++--------------------
 1 file changed, 19 insertions(+), 20 deletions(-)

diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index 47c4f3e3562c..3897f1e79d8d 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -36,6 +36,8 @@
  * @time_esterror:	Estimated error in microseconds holding NTP dispersion
  * @time_freq:		Frequency offset scaled nsecs/secs
  * @time_reftime:	Time at last adjustment in seconds
+ * @time_adjust:	Adjustment value
+ * @ntp_tick_adj:	Constant boot-param configurable NTP tick adjustment (upscaled)
  *
  * Protected by the timekeeping locks.
  */
@@ -51,6 +53,8 @@ struct ntp_data {
 	long			time_esterror;
 	s64			time_freq;
 	time64_t		time_reftime;
+	long			time_adjust;
+	s64			ntp_tick_adj;
 };
 
 static struct ntp_data tk_ntp_data = {
@@ -68,11 +72,6 @@ static struct ntp_data tk_ntp_data = {
 	(((MAX_TICKADJ * NSEC_PER_USEC) << NTP_SCALE_SHIFT) / NTP_INTERVAL_FREQ)
 #define MAX_TAI_OFFSET		100000
 
-static long			time_adjust;
-
-/* constant (boot-param configurable) NTP tick adjustment (upscaled)	*/
-static s64			ntp_tick_adj;
-
 /* second value of the next pending leapsecond, or TIME64_MAX if no leap */
 static time64_t			ntp_next_leap_sec = TIME64_MAX;
 
@@ -242,7 +241,7 @@ static void ntp_update_frequency(struct ntp_data *ntpdata)
 
 	second_length		 = (u64)(tick_usec * NSEC_PER_USEC * USER_HZ) << NTP_SCALE_SHIFT;
 
-	second_length		+= ntp_tick_adj;
+	second_length		+= ntpdata->ntp_tick_adj;
 	second_length		+= ntpdata->time_freq;
 
 	new_base		 = div_u64(second_length, NTP_INTERVAL_FREQ);
@@ -322,7 +321,7 @@ static void ntp_update_offset(struct ntp_data *ntpdata, long offset)
 static void __ntp_clear(struct ntp_data *ntpdata)
 {
 	/* Stop active adjtime() */
-	time_adjust		= 0;
+	ntpdata->time_adjust	= 0;
 	ntpdata->time_status	|= STA_UNSYNC;
 	ntpdata->time_maxerror	= NTP_PHASE_LIMIT;
 	ntpdata->time_esterror	= NTP_PHASE_LIMIT;
@@ -450,24 +449,24 @@ int second_overflow(time64_t secs)
 	/* Check PPS signal */
 	pps_dec_valid(ntpdata);
 
-	if (!time_adjust)
+	if (!ntpdata->time_adjust)
 		goto out;
 
-	if (time_adjust > MAX_TICKADJ) {
-		time_adjust -= MAX_TICKADJ;
+	if (ntpdata->time_adjust > MAX_TICKADJ) {
+		ntpdata->time_adjust -= MAX_TICKADJ;
 		ntpdata->tick_length += MAX_TICKADJ_SCALED;
 		goto out;
 	}
 
-	if (time_adjust < -MAX_TICKADJ) {
-		time_adjust += MAX_TICKADJ;
+	if (ntpdata->time_adjust < -MAX_TICKADJ) {
+		ntpdata->time_adjust += MAX_TICKADJ;
 		ntpdata->tick_length -= MAX_TICKADJ_SCALED;
 		goto out;
 	}
 
-	ntpdata->tick_length += (s64)(time_adjust * NSEC_PER_USEC / NTP_INTERVAL_FREQ)
+	ntpdata->tick_length += (s64)(ntpdata->time_adjust * NSEC_PER_USEC / NTP_INTERVAL_FREQ)
 				<< NTP_SCALE_SHIFT;
-	time_adjust = 0;
+	ntpdata->time_adjust = 0;
 
 out:
 	return leap;
@@ -750,15 +749,15 @@ int __do_adjtimex(struct __kernel_timex *txc, const struct timespec64 *ts,
 	int result;
 
 	if (txc->modes & ADJ_ADJTIME) {
-		long save_adjust = time_adjust;
+		long save_adjust = ntpdata->time_adjust;
 
 		if (!(txc->modes & ADJ_OFFSET_READONLY)) {
 			/* adjtime() is independent from ntp_adjtime() */
-			time_adjust = txc->offset;
+			ntpdata->time_adjust = txc->offset;
 			ntp_update_frequency(ntpdata);
 
 			audit_ntp_set_old(ad, AUDIT_NTP_ADJUST,	save_adjust);
-			audit_ntp_set_new(ad, AUDIT_NTP_ADJUST,	time_adjust);
+			audit_ntp_set_new(ad, AUDIT_NTP_ADJUST,	ntpdata->time_adjust);
 		}
 		txc->offset = save_adjust;
 	} else {
@@ -995,7 +994,7 @@ static void hardpps_update_phase(struct ntp_data *ntpdata, long error)
 		ntpdata->time_offset = div_s64(((s64)correction) << NTP_SCALE_SHIFT,
 					       NTP_INTERVAL_FREQ);
 		/* Cancel running adjtime() */
-		time_adjust = 0;
+		ntpdata->time_adjust = 0;
 	}
 	/* Update jitter */
 	pps_jitter += (jitter - pps_jitter) >> PPS_INTMIN;
@@ -1067,11 +1066,11 @@ void __hardpps(const struct timespec64 *phase_ts, const struct timespec64 *raw_t
 
 static int __init ntp_tick_adj_setup(char *str)
 {
-	int rc = kstrtos64(str, 0, &ntp_tick_adj);
+	int rc = kstrtos64(str, 0, &tk_ntp_data.ntp_tick_adj);
 	if (rc)
 		return rc;
 
-	ntp_tick_adj <<= NTP_SCALE_SHIFT;
+	tk_ntp_data.ntp_tick_adj <<= NTP_SCALE_SHIFT;
 	return 1;
 }
 

-- 
2.39.2

[PATCH 14/21] ntp: Move ntp_next_leap_sec into ntp_data

[Anna-Maria Behnsen]

From: Thomas Gleixner <tglx@linutronix.de>

Continue the conversion from static variables to struct based data.

No functional change.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>
---
 kernel/time/ntp.c | 32 ++++++++++++++++----------------
 1 file changed, 16 insertions(+), 16 deletions(-)

diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index 3897f1e79d8d..33d52b9dbff6 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -38,6 +38,7 @@
  * @time_reftime:	Time at last adjustment in seconds
  * @time_adjust:	Adjustment value
  * @ntp_tick_adj:	Constant boot-param configurable NTP tick adjustment (upscaled)
+ * @ntp_next_leap_sec:	Second value of the next pending leapsecond, or TIME64_MAX if no leap
  *
  * Protected by the timekeeping locks.
  */
@@ -55,6 +56,7 @@ struct ntp_data {
 	time64_t		time_reftime;
 	long			time_adjust;
 	s64			ntp_tick_adj;
+	time64_t		ntp_next_leap_sec;
 };
 
 static struct ntp_data tk_ntp_data = {
@@ -64,6 +66,7 @@ static struct ntp_data tk_ntp_data = {
 	.time_constant		= 2,
 	.time_maxerror		= NTP_PHASE_LIMIT,
 	.time_esterror		= NTP_PHASE_LIMIT,
+	.ntp_next_leap_sec	= TIME64_MAX,
 };
 
 #define SECS_PER_DAY		86400
@@ -72,9 +75,6 @@ static struct ntp_data tk_ntp_data = {
 	(((MAX_TICKADJ * NSEC_PER_USEC) << NTP_SCALE_SHIFT) / NTP_INTERVAL_FREQ)
 #define MAX_TAI_OFFSET		100000
 
-/* second value of the next pending leapsecond, or TIME64_MAX if no leap */
-static time64_t			ntp_next_leap_sec = TIME64_MAX;
-
 #ifdef CONFIG_NTP_PPS
 
 /*
@@ -331,7 +331,7 @@ static void __ntp_clear(struct ntp_data *ntpdata)
 	ntpdata->tick_length	= ntpdata->tick_length_base;
 	ntpdata->time_offset	= 0;
 
-	ntp_next_leap_sec = TIME64_MAX;
+	ntpdata->ntp_next_leap_sec = TIME64_MAX;
 	/* Clear PPS state variables */
 	pps_clear();
 }
@@ -362,7 +362,7 @@ ktime_t ntp_get_next_leap(void)
 	ktime_t ret;
 
 	if ((ntpdata->time_state == TIME_INS) && (ntpdata->time_status & STA_INS))
-		return ktime_set(ntp_next_leap_sec, 0);
+		return ktime_set(ntpdata->ntp_next_leap_sec, 0);
 	ret = KTIME_MAX;
 	return ret;
 }
@@ -394,18 +394,18 @@ int second_overflow(time64_t secs)
 		if (ntpdata->time_status & STA_INS) {
 			ntpdata->time_state = TIME_INS;
 			div_s64_rem(secs, SECS_PER_DAY, &rem);
-			ntp_next_leap_sec = secs + SECS_PER_DAY - rem;
+			ntpdata->ntp_next_leap_sec = secs + SECS_PER_DAY - rem;
 		} else if (ntpdata->time_status & STA_DEL) {
 			ntpdata->time_state = TIME_DEL;
 			div_s64_rem(secs + 1, SECS_PER_DAY, &rem);
-			ntp_next_leap_sec = secs + SECS_PER_DAY - rem;
+			ntpdata->ntp_next_leap_sec = secs + SECS_PER_DAY - rem;
 		}
 		break;
 	case TIME_INS:
 		if (!(ntpdata->time_status & STA_INS)) {
-			ntp_next_leap_sec = TIME64_MAX;
+			ntpdata->ntp_next_leap_sec = TIME64_MAX;
 			ntpdata->time_state = TIME_OK;
-		} else if (secs == ntp_next_leap_sec) {
+		} else if (secs == ntpdata->ntp_next_leap_sec) {
 			leap = -1;
 			ntpdata->time_state = TIME_OOP;
 			pr_notice("Clock: inserting leap second 23:59:60 UTC\n");
@@ -413,17 +413,17 @@ int second_overflow(time64_t secs)
 		break;
 	case TIME_DEL:
 		if (!(ntpdata->time_status & STA_DEL)) {
-			ntp_next_leap_sec = TIME64_MAX;
+			ntpdata->ntp_next_leap_sec = TIME64_MAX;
 			ntpdata->time_state = TIME_OK;
-		} else if (secs == ntp_next_leap_sec) {
+		} else if (secs == ntpdata->ntp_next_leap_sec) {
 			leap = 1;
-			ntp_next_leap_sec = TIME64_MAX;
+			ntpdata->ntp_next_leap_sec = TIME64_MAX;
 			ntpdata->time_state = TIME_WAIT;
 			pr_notice("Clock: deleting leap second 23:59:59 UTC\n");
 		}
 		break;
 	case TIME_OOP:
-		ntp_next_leap_sec = TIME64_MAX;
+		ntpdata->ntp_next_leap_sec = TIME64_MAX;
 		ntpdata->time_state = TIME_WAIT;
 		break;
 	case TIME_WAIT:
@@ -675,7 +675,7 @@ static inline void process_adj_status(struct ntp_data *ntpdata, const struct __k
 	if ((ntpdata->time_status & STA_PLL) && !(txc->status & STA_PLL)) {
 		ntpdata->time_state = TIME_OK;
 		ntpdata->time_status = STA_UNSYNC;
-		ntp_next_leap_sec = TIME64_MAX;
+		ntpdata->ntp_next_leap_sec = TIME64_MAX;
 		/* Restart PPS frequency calibration */
 		pps_reset_freq_interval();
 	}
@@ -807,7 +807,7 @@ int __do_adjtimex(struct __kernel_timex *txc, const struct timespec64 *ts,
 		txc->time.tv_usec = ts->tv_nsec / NSEC_PER_USEC;
 
 	/* Handle leapsec adjustments */
-	if (unlikely(ts->tv_sec >= ntp_next_leap_sec)) {
+	if (unlikely(ts->tv_sec >= ntpdata->ntp_next_leap_sec)) {
 		if ((ntpdata->time_state == TIME_INS) && (ntpdata->time_status & STA_INS)) {
 			result = TIME_OOP;
 			txc->tai++;
@@ -818,7 +818,7 @@ int __do_adjtimex(struct __kernel_timex *txc, const struct timespec64 *ts,
 			txc->tai--;
 			txc->time.tv_sec++;
 		}
-		if ((ntpdata->time_state == TIME_OOP) && (ts->tv_sec == ntp_next_leap_sec))
+		if ((ntpdata->time_state == TIME_OOP) && (ts->tv_sec == ntpdata->ntp_next_leap_sec))
 			result = TIME_WAIT;
 	}
 

-- 
2.39.2

[PATCH 15/21] ntp: Move pps_valid into ntp_data

[Anna-Maria Behnsen]

From: Thomas Gleixner <tglx@linutronix.de>

Continue the conversion from static variables to struct based data.

No functional change.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>
---
 kernel/time/ntp.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index 33d52b9dbff6..35cca57e017e 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -40,6 +40,8 @@
  * @ntp_tick_adj:	Constant boot-param configurable NTP tick adjustment (upscaled)
  * @ntp_next_leap_sec:	Second value of the next pending leapsecond, or TIME64_MAX if no leap
  *
+ * @pps_valid:		PPS signal watchdog counter
+ *
  * Protected by the timekeeping locks.
  */
 struct ntp_data {
@@ -57,6 +59,9 @@ struct ntp_data {
 	long			time_adjust;
 	s64			ntp_tick_adj;
 	time64_t		ntp_next_leap_sec;
+#ifdef CONFIG_NTP_PPS
+	int			pps_valid;
+#endif
 };
 
 static struct ntp_data tk_ntp_data = {
@@ -91,7 +96,6 @@ static struct ntp_data tk_ntp_data = {
 				   intervals to decrease it */
 #define PPS_MAXWANDER	100000	/* max PPS freq wander (ns/s) */
 
-static int pps_valid;		/* signal watchdog counter */
 static long pps_tf[3];		/* phase median filter */
 static long pps_jitter;		/* current jitter (ns) */
 static struct timespec64 pps_fbase; /* beginning of the last freq interval */
@@ -147,9 +151,9 @@ static inline void pps_clear(void)
  */
 static inline void pps_dec_valid(struct ntp_data *ntpdata)
 {
-	if (pps_valid > 0)
-		pps_valid--;
-	else {
+	if (ntpdata->pps_valid > 0) {
+		ntpdata->pps_valid--;
+	} else {
 		ntpdata->time_status &= ~(STA_PPSSIGNAL | STA_PPSJITTER |
 					  STA_PPSWANDER | STA_PPSERROR);
 		pps_clear();
@@ -1024,7 +1028,7 @@ void __hardpps(const struct timespec64 *phase_ts, const struct timespec64 *raw_t
 
 	/* indicate signal presence */
 	ntpdata->time_status |= STA_PPSSIGNAL;
-	pps_valid = PPS_VALID;
+	ntpdata->pps_valid = PPS_VALID;
 
 	/*
 	 * When called for the first time, just start the frequency

-- 
2.39.2

[PATCH 16/21] ntp: Move pps_ft into ntp_data

[Anna-Maria Behnsen]

From: Thomas Gleixner <tglx@linutronix.de>

Continue the conversion from static variables to struct based data.

No functional change.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>
---
 kernel/time/ntp.c | 36 +++++++++++++++++++-----------------
 1 file changed, 19 insertions(+), 17 deletions(-)

diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index 35cca57e017e..22fece642c61 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -41,6 +41,7 @@
  * @ntp_next_leap_sec:	Second value of the next pending leapsecond, or TIME64_MAX if no leap
  *
  * @pps_valid:		PPS signal watchdog counter
+ * @pps_tf:		PPS phase median filter
  *
  * Protected by the timekeeping locks.
  */
@@ -61,6 +62,7 @@ struct ntp_data {
 	time64_t		ntp_next_leap_sec;
 #ifdef CONFIG_NTP_PPS
 	int			pps_valid;
+	long			pps_tf[3];
 #endif
 };
 
@@ -96,7 +98,6 @@ static struct ntp_data tk_ntp_data = {
 				   intervals to decrease it */
 #define PPS_MAXWANDER	100000	/* max PPS freq wander (ns/s) */
 
-static long pps_tf[3];		/* phase median filter */
 static long pps_jitter;		/* current jitter (ns) */
 static struct timespec64 pps_fbase; /* beginning of the last freq interval */
 static int pps_shift;		/* current interval duration (s) (shift) */
@@ -134,13 +135,14 @@ static inline void pps_reset_freq_interval(void)
 
 /**
  * pps_clear - Clears the PPS state variables
+ * @ntpdata:	Pointer to ntp data
  */
-static inline void pps_clear(void)
+static inline void pps_clear(struct ntp_data *ntpdata)
 {
 	pps_reset_freq_interval();
-	pps_tf[0] = 0;
-	pps_tf[1] = 0;
-	pps_tf[2] = 0;
+	ntpdata->pps_tf[0] = 0;
+	ntpdata->pps_tf[1] = 0;
+	ntpdata->pps_tf[2] = 0;
 	pps_fbase.tv_sec = pps_fbase.tv_nsec = 0;
 	pps_freq = 0;
 }
@@ -156,7 +158,7 @@ static inline void pps_dec_valid(struct ntp_data *ntpdata)
 	} else {
 		ntpdata->time_status &= ~(STA_PPSSIGNAL | STA_PPSJITTER |
 					  STA_PPSWANDER | STA_PPSERROR);
-		pps_clear();
+		pps_clear(ntpdata);
 	}
 }
 
@@ -211,7 +213,7 @@ static inline s64 ntp_offset_chunk(struct ntp_data *ntpdata, s64 offset)
 }
 
 static inline void pps_reset_freq_interval(void) {}
-static inline void pps_clear(void) {}
+static inline void pps_clear(struct ntp_data *ntpdata) {}
 static inline void pps_dec_valid(struct ntp_data *ntpdata) {}
 static inline void pps_set_freq(s64 freq) {}
 
@@ -337,7 +339,7 @@ static void __ntp_clear(struct ntp_data *ntpdata)
 
 	ntpdata->ntp_next_leap_sec = TIME64_MAX;
 	/* Clear PPS state variables */
-	pps_clear();
+	pps_clear(ntpdata);
 }
 
 /**
@@ -862,22 +864,22 @@ static inline struct pps_normtime pps_normalize_ts(struct timespec64 ts)
 }
 
 /* Get current phase correction and jitter */
-static inline long pps_phase_filter_get(long *jitter)
+static inline long pps_phase_filter_get(struct ntp_data *ntpdata, long *jitter)
 {
-	*jitter = pps_tf[0] - pps_tf[1];
+	*jitter = ntpdata->pps_tf[0] - ntpdata->pps_tf[1];
 	if (*jitter < 0)
 		*jitter = -*jitter;
 
 	/* TODO: test various filters */
-	return pps_tf[0];
+	return ntpdata->pps_tf[0];
 }
 
 /* Add the sample to the phase filter */
-static inline void pps_phase_filter_add(long err)
+static inline void pps_phase_filter_add(struct ntp_data *ntpdata, long err)
 {
-	pps_tf[2] = pps_tf[1];
-	pps_tf[1] = pps_tf[0];
-	pps_tf[0] = err;
+	ntpdata->pps_tf[2] = ntpdata->pps_tf[1];
+	ntpdata->pps_tf[1] = ntpdata->pps_tf[0];
+	ntpdata->pps_tf[0] = err;
 }
 
 /*
@@ -980,8 +982,8 @@ static void hardpps_update_phase(struct ntp_data *ntpdata, long error)
 	long jitter;
 
 	/* Add the sample to the median filter */
-	pps_phase_filter_add(correction);
-	correction = pps_phase_filter_get(&jitter);
+	pps_phase_filter_add(ntpdata, correction);
+	correction = pps_phase_filter_get(ntpdata, &jitter);
 
 	/*
 	 * Nominal jitter is due to PPS signal noise. If it exceeds the

-- 
2.39.2

[PATCH 17/21] ntp: Move pps_jitter into ntp_data

[Anna-Maria Behnsen]

From: Thomas Gleixner <tglx@linutronix.de>

Continue the conversion from static variables to struct based data.

No functional change.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>
---
 kernel/time/ntp.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index 22fece642c61..dc1e1d5dbd9c 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -42,6 +42,7 @@
  *
  * @pps_valid:		PPS signal watchdog counter
  * @pps_tf:		PPS phase median filter
+ * @pps_jitter:		PPS current jitter in nanoseconds
  *
  * Protected by the timekeeping locks.
  */
@@ -63,6 +64,7 @@ struct ntp_data {
 #ifdef CONFIG_NTP_PPS
 	int			pps_valid;
 	long			pps_tf[3];
+	long			pps_jitter;
 #endif
 };
 
@@ -98,7 +100,6 @@ static struct ntp_data tk_ntp_data = {
 				   intervals to decrease it */
 #define PPS_MAXWANDER	100000	/* max PPS freq wander (ns/s) */
 
-static long pps_jitter;		/* current jitter (ns) */
 static struct timespec64 pps_fbase; /* beginning of the last freq interval */
 static int pps_shift;		/* current interval duration (s) (shift) */
 static int pps_intcnt;		/* interval counter */
@@ -194,9 +195,9 @@ static inline void pps_fill_timex(struct ntp_data *ntpdata, struct __kernel_time
 {
 	txc->ppsfreq	   = shift_right((pps_freq >> PPM_SCALE_INV_SHIFT) *
 					 PPM_SCALE_INV, NTP_SCALE_SHIFT);
-	txc->jitter	   = pps_jitter;
+	txc->jitter	   = ntpdata->pps_jitter;
 	if (!(ntpdata->time_status & STA_NANO))
-		txc->jitter = pps_jitter / NSEC_PER_USEC;
+		txc->jitter = ntpdata->pps_jitter / NSEC_PER_USEC;
 	txc->shift	   = pps_shift;
 	txc->stabil	   = pps_stabil;
 	txc->jitcnt	   = pps_jitcnt;
@@ -990,9 +991,9 @@ static void hardpps_update_phase(struct ntp_data *ntpdata, long error)
 	 * threshold, the sample is discarded; otherwise, if so enabled,
 	 * the time offset is updated.
 	 */
-	if (jitter > (pps_jitter << PPS_POPCORN)) {
+	if (jitter > (ntpdata->pps_jitter << PPS_POPCORN)) {
 		printk_deferred(KERN_WARNING "hardpps: PPSJITTER: jitter=%ld, limit=%ld\n",
-				jitter, (pps_jitter << PPS_POPCORN));
+				jitter, (ntpdata->pps_jitter << PPS_POPCORN));
 		ntpdata->time_status |= STA_PPSJITTER;
 		pps_jitcnt++;
 	} else if (ntpdata->time_status & STA_PPSTIME) {
@@ -1003,7 +1004,7 @@ static void hardpps_update_phase(struct ntp_data *ntpdata, long error)
 		ntpdata->time_adjust = 0;
 	}
 	/* Update jitter */
-	pps_jitter += (jitter - pps_jitter) >> PPS_INTMIN;
+	ntpdata->pps_jitter += (jitter - ntpdata->pps_jitter) >> PPS_INTMIN;
 }
 
 /*

-- 
2.39.2

[PATCH 18/21] ntp: Move pps_fbase into ntp_data

[Anna-Maria Behnsen]

From: Thomas Gleixner <tglx@linutronix.de>

Continue the conversion from static variables to struct based data.

No functional change.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>
---
 kernel/time/ntp.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index dc1e1d5dbd9c..4098c38fbc3f 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -43,6 +43,7 @@
  * @pps_valid:		PPS signal watchdog counter
  * @pps_tf:		PPS phase median filter
  * @pps_jitter:		PPS current jitter in nanoseconds
+ * @pps_fbase:		PPS beginning of the last freq interval
  *
  * Protected by the timekeeping locks.
  */
@@ -65,6 +66,7 @@ struct ntp_data {
 	int			pps_valid;
 	long			pps_tf[3];
 	long			pps_jitter;
+	struct timespec64	pps_fbase;
 #endif
 };
 
@@ -100,7 +102,6 @@ static struct ntp_data tk_ntp_data = {
 				   intervals to decrease it */
 #define PPS_MAXWANDER	100000	/* max PPS freq wander (ns/s) */
 
-static struct timespec64 pps_fbase; /* beginning of the last freq interval */
 static int pps_shift;		/* current interval duration (s) (shift) */
 static int pps_intcnt;		/* interval counter */
 static s64 pps_freq;		/* frequency offset (scaled ns/s) */
@@ -144,7 +145,7 @@ static inline void pps_clear(struct ntp_data *ntpdata)
 	ntpdata->pps_tf[0] = 0;
 	ntpdata->pps_tf[1] = 0;
 	ntpdata->pps_tf[2] = 0;
-	pps_fbase.tv_sec = pps_fbase.tv_nsec = 0;
+	ntpdata->pps_fbase.tv_sec = ntpdata->pps_fbase.tv_nsec = 0;
 	pps_freq = 0;
 }
 
@@ -1037,13 +1038,13 @@ void __hardpps(const struct timespec64 *phase_ts, const struct timespec64 *raw_t
 	 * When called for the first time, just start the frequency
 	 * interval
 	 */
-	if (unlikely(pps_fbase.tv_sec == 0)) {
-		pps_fbase = *raw_ts;
+	if (unlikely(ntpdata->pps_fbase.tv_sec == 0)) {
+		ntpdata->pps_fbase = *raw_ts;
 		return;
 	}
 
 	/* Ok, now we have a base for frequency calculation */
-	freq_norm = pps_normalize_ts(timespec64_sub(*raw_ts, pps_fbase));
+	freq_norm = pps_normalize_ts(timespec64_sub(*raw_ts, ntpdata->pps_fbase));
 
 	/*
 	 * Check that the signal is in the range
@@ -1053,7 +1054,7 @@ void __hardpps(const struct timespec64 *phase_ts, const struct timespec64 *raw_t
 	    (freq_norm.nsec < -MAXFREQ * freq_norm.sec)) {
 		ntpdata->time_status |= STA_PPSJITTER;
 		/* Restart the frequency calibration interval */
-		pps_fbase = *raw_ts;
+		ntpdata->pps_fbase = *raw_ts;
 		printk_deferred(KERN_ERR "hardpps: PPSJITTER: bad pulse\n");
 		return;
 	}
@@ -1062,7 +1063,7 @@ void __hardpps(const struct timespec64 *phase_ts, const struct timespec64 *raw_t
 	if (freq_norm.sec >= (1 << pps_shift)) {
 		pps_calcnt++;
 		/* Restart the frequency calibration interval */
-		pps_fbase = *raw_ts;
+		ntpdata->pps_fbase = *raw_ts;
 		hardpps_update_freq(ntpdata, freq_norm);
 	}
 

-- 
2.39.2

[PATCH 19/21] ntp: Move pps_shift/intcnt into ntp_data

[Anna-Maria Behnsen]

From: Thomas Gleixner <tglx@linutronix.de>

Continue the conversion from static variables to struct based data.

No functional change.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>
---
 kernel/time/ntp.c | 54 ++++++++++++++++++++++++++++--------------------------
 1 file changed, 28 insertions(+), 26 deletions(-)

diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index 4098c38fbc3f..a9103b08d1ec 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -44,6 +44,8 @@
  * @pps_tf:		PPS phase median filter
  * @pps_jitter:		PPS current jitter in nanoseconds
  * @pps_fbase:		PPS beginning of the last freq interval
+ * @pps_shift:		PPS current interval duration in seconds (shift value)
+ * @pps_intcnt:		PPS interval counter
  *
  * Protected by the timekeeping locks.
  */
@@ -67,6 +69,8 @@ struct ntp_data {
 	long			pps_tf[3];
 	long			pps_jitter;
 	struct timespec64	pps_fbase;
+	int			pps_shift;
+	int			pps_intcnt;
 #endif
 };
 
@@ -102,8 +106,6 @@ static struct ntp_data tk_ntp_data = {
 				   intervals to decrease it */
 #define PPS_MAXWANDER	100000	/* max PPS freq wander (ns/s) */
 
-static int pps_shift;		/* current interval duration (s) (shift) */
-static int pps_intcnt;		/* interval counter */
 static s64 pps_freq;		/* frequency offset (scaled ns/s) */
 static long pps_stabil;		/* current stability (scaled ns/s) */
 
@@ -128,11 +130,11 @@ static inline s64 ntp_offset_chunk(struct ntp_data *ntpdata, s64 offset)
 		return shift_right(offset, SHIFT_PLL + ntpdata->time_constant);
 }
 
-static inline void pps_reset_freq_interval(void)
+static inline void pps_reset_freq_interval(struct ntp_data *ntpdata)
 {
 	/* The PPS calibration interval may end surprisingly early */
-	pps_shift = PPS_INTMIN;
-	pps_intcnt = 0;
+	ntpdata->pps_shift = PPS_INTMIN;
+	ntpdata->pps_intcnt = 0;
 }
 
 /**
@@ -141,7 +143,7 @@ static inline void pps_reset_freq_interval(void)
  */
 static inline void pps_clear(struct ntp_data *ntpdata)
 {
-	pps_reset_freq_interval();
+	pps_reset_freq_interval(ntpdata);
 	ntpdata->pps_tf[0] = 0;
 	ntpdata->pps_tf[1] = 0;
 	ntpdata->pps_tf[2] = 0;
@@ -199,7 +201,7 @@ static inline void pps_fill_timex(struct ntp_data *ntpdata, struct __kernel_time
 	txc->jitter	   = ntpdata->pps_jitter;
 	if (!(ntpdata->time_status & STA_NANO))
 		txc->jitter = ntpdata->pps_jitter / NSEC_PER_USEC;
-	txc->shift	   = pps_shift;
+	txc->shift	   = ntpdata->pps_shift;
 	txc->stabil	   = pps_stabil;
 	txc->jitcnt	   = pps_jitcnt;
 	txc->calcnt	   = pps_calcnt;
@@ -214,7 +216,7 @@ static inline s64 ntp_offset_chunk(struct ntp_data *ntpdata, s64 offset)
 	return shift_right(offset, SHIFT_PLL + ntpdata->time_constant);
 }
 
-static inline void pps_reset_freq_interval(void) {}
+static inline void pps_reset_freq_interval(struct ntp_data *ntpdata) {}
 static inline void pps_clear(struct ntp_data *ntpdata) {}
 static inline void pps_dec_valid(struct ntp_data *ntpdata) {}
 static inline void pps_set_freq(s64 freq) {}
@@ -685,7 +687,7 @@ static inline void process_adj_status(struct ntp_data *ntpdata, const struct __k
 		ntpdata->time_status = STA_UNSYNC;
 		ntpdata->ntp_next_leap_sec = TIME64_MAX;
 		/* Restart PPS frequency calibration */
-		pps_reset_freq_interval();
+		pps_reset_freq_interval(ntpdata);
 	}
 
 	/*
@@ -888,13 +890,13 @@ static inline void pps_phase_filter_add(struct ntp_data *ntpdata, long err)
  * Decrease frequency calibration interval length. It is halved after four
  * consecutive unstable intervals.
  */
-static inline void pps_dec_freq_interval(void)
+static inline void pps_dec_freq_interval(struct ntp_data *ntpdata)
 {
-	if (--pps_intcnt <= -PPS_INTCOUNT) {
-		pps_intcnt = -PPS_INTCOUNT;
-		if (pps_shift > PPS_INTMIN) {
-			pps_shift--;
-			pps_intcnt = 0;
+	if (--ntpdata->pps_intcnt <= -PPS_INTCOUNT) {
+		ntpdata->pps_intcnt = -PPS_INTCOUNT;
+		if (ntpdata->pps_shift > PPS_INTMIN) {
+			ntpdata->pps_shift--;
+			ntpdata->pps_intcnt = 0;
 		}
 	}
 }
@@ -903,13 +905,13 @@ static inline void pps_dec_freq_interval(void)
  * Increase frequency calibration interval length. It is doubled after
  * four consecutive stable intervals.
  */
-static inline void pps_inc_freq_interval(void)
+static inline void pps_inc_freq_interval(struct ntp_data *ntpdata)
 {
-	if (++pps_intcnt >= PPS_INTCOUNT) {
-		pps_intcnt = PPS_INTCOUNT;
-		if (pps_shift < PPS_INTMAX) {
-			pps_shift++;
-			pps_intcnt = 0;
+	if (++ntpdata->pps_intcnt >= PPS_INTCOUNT) {
+		ntpdata->pps_intcnt = PPS_INTCOUNT;
+		if (ntpdata->pps_shift < PPS_INTMAX) {
+			ntpdata->pps_shift++;
+			ntpdata->pps_intcnt = 0;
 		}
 	}
 }
@@ -930,10 +932,10 @@ static long hardpps_update_freq(struct ntp_data *ntpdata, struct pps_normtime fr
 	s64 ftemp;
 
 	/* Check if the frequency interval was too long */
-	if (freq_norm.sec > (2 << pps_shift)) {
+	if (freq_norm.sec > (2 << ntpdata->pps_shift)) {
 		ntpdata->time_status |= STA_PPSERROR;
 		pps_errcnt++;
-		pps_dec_freq_interval();
+		pps_dec_freq_interval(ntpdata);
 		printk_deferred(KERN_ERR "hardpps: PPSERROR: interval too long - %lld s\n",
 				freq_norm.sec);
 		return 0;
@@ -952,10 +954,10 @@ static long hardpps_update_freq(struct ntp_data *ntpdata, struct pps_normtime fr
 		printk_deferred(KERN_WARNING "hardpps: PPSWANDER: change=%ld\n", delta);
 		ntpdata->time_status |= STA_PPSWANDER;
 		pps_stbcnt++;
-		pps_dec_freq_interval();
+		pps_dec_freq_interval(ntpdata);
 	} else {
 		/* Good sample */
-		pps_inc_freq_interval();
+		pps_inc_freq_interval(ntpdata);
 	}
 
 	/*
@@ -1060,7 +1062,7 @@ void __hardpps(const struct timespec64 *phase_ts, const struct timespec64 *raw_t
 	}
 
 	/* Signal is ok. Check if the current frequency interval is finished */
-	if (freq_norm.sec >= (1 << pps_shift)) {
+	if (freq_norm.sec >= (1 << ntpdata->pps_shift)) {
 		pps_calcnt++;
 		/* Restart the frequency calibration interval */
 		ntpdata->pps_fbase = *raw_ts;

-- 
2.39.2

[PATCH 20/21] ntp: Move pps_freq/stabil into ntp_data

[Anna-Maria Behnsen]

From: Thomas Gleixner <tglx@linutronix.de>

Continue the conversion from static variables to struct based data.

No functional change.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>
---
 kernel/time/ntp.c | 31 ++++++++++++++++---------------
 1 file changed, 16 insertions(+), 15 deletions(-)

diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index a9103b08d1ec..c3089d8be0f7 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -46,6 +46,8 @@
  * @pps_fbase:		PPS beginning of the last freq interval
  * @pps_shift:		PPS current interval duration in seconds (shift value)
  * @pps_intcnt:		PPS interval counter
+ * @pps_freq:		PPS frequency offset in scaled ns/s
+ * @pps_stabil:		PPS current stability in scaled ns/s
  *
  * Protected by the timekeeping locks.
  */
@@ -71,6 +73,8 @@ struct ntp_data {
 	struct timespec64	pps_fbase;
 	int			pps_shift;
 	int			pps_intcnt;
+	s64			pps_freq;
+	long			pps_stabil;
 #endif
 };
 
@@ -106,9 +110,6 @@ static struct ntp_data tk_ntp_data = {
 				   intervals to decrease it */
 #define PPS_MAXWANDER	100000	/* max PPS freq wander (ns/s) */
 
-static s64 pps_freq;		/* frequency offset (scaled ns/s) */
-static long pps_stabil;		/* current stability (scaled ns/s) */
-
 /*
  * PPS signal quality monitors
  */
@@ -148,7 +149,7 @@ static inline void pps_clear(struct ntp_data *ntpdata)
 	ntpdata->pps_tf[1] = 0;
 	ntpdata->pps_tf[2] = 0;
 	ntpdata->pps_fbase.tv_sec = ntpdata->pps_fbase.tv_nsec = 0;
-	pps_freq = 0;
+	ntpdata->pps_freq = 0;
 }
 
 /*
@@ -166,9 +167,9 @@ static inline void pps_dec_valid(struct ntp_data *ntpdata)
 	}
 }
 
-static inline void pps_set_freq(s64 freq)
+static inline void pps_set_freq(struct ntp_data *ntpdata)
 {
-	pps_freq = freq;
+	ntpdata->pps_freq = ntpdata->time_freq;
 }
 
 static inline bool is_error_status(int status)
@@ -196,13 +197,13 @@ static inline bool is_error_status(int status)
 
 static inline void pps_fill_timex(struct ntp_data *ntpdata, struct __kernel_timex *txc)
 {
-	txc->ppsfreq	   = shift_right((pps_freq >> PPM_SCALE_INV_SHIFT) *
+	txc->ppsfreq	   = shift_right((ntpdata->pps_freq >> PPM_SCALE_INV_SHIFT) *
 					 PPM_SCALE_INV, NTP_SCALE_SHIFT);
 	txc->jitter	   = ntpdata->pps_jitter;
 	if (!(ntpdata->time_status & STA_NANO))
 		txc->jitter = ntpdata->pps_jitter / NSEC_PER_USEC;
 	txc->shift	   = ntpdata->pps_shift;
-	txc->stabil	   = pps_stabil;
+	txc->stabil	   = ntpdata->pps_stabil;
 	txc->jitcnt	   = pps_jitcnt;
 	txc->calcnt	   = pps_calcnt;
 	txc->errcnt	   = pps_errcnt;
@@ -219,7 +220,7 @@ static inline s64 ntp_offset_chunk(struct ntp_data *ntpdata, s64 offset)
 static inline void pps_reset_freq_interval(struct ntp_data *ntpdata) {}
 static inline void pps_clear(struct ntp_data *ntpdata) {}
 static inline void pps_dec_valid(struct ntp_data *ntpdata) {}
-static inline void pps_set_freq(s64 freq) {}
+static inline void pps_set_freq(struct ntp_data *ntpdata) {}
 
 static inline bool is_error_status(int status)
 {
@@ -719,7 +720,7 @@ static inline void process_adjtimex_modes(struct ntp_data *ntpdata, const struct
 		ntpdata->time_freq = min(ntpdata->time_freq, MAXFREQ_SCALED);
 		ntpdata->time_freq = max(ntpdata->time_freq, -MAXFREQ_SCALED);
 		/* Update pps_freq */
-		pps_set_freq(ntpdata->time_freq);
+		pps_set_freq(ntpdata);
 	}
 
 	if (txc->modes & ADJ_MAXERROR)
@@ -948,8 +949,8 @@ static long hardpps_update_freq(struct ntp_data *ntpdata, struct pps_normtime fr
 	 */
 	ftemp = div_s64(((s64)(-freq_norm.nsec)) << NTP_SCALE_SHIFT,
 			freq_norm.sec);
-	delta = shift_right(ftemp - pps_freq, NTP_SCALE_SHIFT);
-	pps_freq = ftemp;
+	delta = shift_right(ftemp - ntpdata->pps_freq, NTP_SCALE_SHIFT);
+	ntpdata->pps_freq = ftemp;
 	if (delta > PPS_MAXWANDER || delta < -PPS_MAXWANDER) {
 		printk_deferred(KERN_WARNING "hardpps: PPSWANDER: change=%ld\n", delta);
 		ntpdata->time_status |= STA_PPSWANDER;
@@ -967,12 +968,12 @@ static long hardpps_update_freq(struct ntp_data *ntpdata, struct pps_normtime fr
 	delta_mod = delta;
 	if (delta_mod < 0)
 		delta_mod = -delta_mod;
-	pps_stabil += (div_s64(((s64)delta_mod) << (NTP_SCALE_SHIFT - SHIFT_USEC),
-			       NSEC_PER_USEC) - pps_stabil) >> PPS_INTMIN;
+	ntpdata->pps_stabil += (div_s64(((s64)delta_mod) << (NTP_SCALE_SHIFT - SHIFT_USEC),
+				     NSEC_PER_USEC) - ntpdata->pps_stabil) >> PPS_INTMIN;
 
 	/* If enabled, the system clock frequency is updated */
 	if ((ntpdata->time_status & STA_PPSFREQ) && !(ntpdata->time_status & STA_FREQHOLD)) {
-		ntpdata->time_freq = pps_freq;
+		ntpdata->time_freq = ntpdata->pps_freq;
 		ntp_update_frequency(ntpdata);
 	}
 

-- 
2.39.2

[PATCH 21/21] ntp: Move pps monitors into ntp_data

[Anna-Maria Behnsen]

From: Thomas Gleixner <tglx@linutronix.de>

Finalize the conversion from static variables to struct based data.

No functional change.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>
---
 kernel/time/ntp.c | 33 ++++++++++++++++-----------------
 1 file changed, 16 insertions(+), 17 deletions(-)

diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index c3089d8be0f7..a2f57599a815 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -48,6 +48,10 @@
  * @pps_intcnt:		PPS interval counter
  * @pps_freq:		PPS frequency offset in scaled ns/s
  * @pps_stabil:		PPS current stability in scaled ns/s
+ * @pps_calcnt:		PPS monitor: calibration intervals
+ * @pps_jitcnt:		PPS monitor: jitter limit exceeded
+ * @pps_stbcnt:		PPS monitor: stability limit exceeded
+ * @pps_errcnt:		PPS monitor: calibration errors
  *
  * Protected by the timekeeping locks.
  */
@@ -75,6 +79,10 @@ struct ntp_data {
 	int			pps_intcnt;
 	s64			pps_freq;
 	long			pps_stabil;
+	long			pps_calcnt;
+	long			pps_jitcnt;
+	long			pps_stbcnt;
+	long			pps_errcnt;
 #endif
 };
 
@@ -110,15 +118,6 @@ static struct ntp_data tk_ntp_data = {
 				   intervals to decrease it */
 #define PPS_MAXWANDER	100000	/* max PPS freq wander (ns/s) */
 
-/*
- * PPS signal quality monitors
- */
-static long pps_calcnt;		/* calibration intervals */
-static long pps_jitcnt;		/* jitter limit exceeded */
-static long pps_stbcnt;		/* stability limit exceeded */
-static long pps_errcnt;		/* calibration errors */
-
-
 /*
  * PPS kernel consumer compensates the whole phase error immediately.
  * Otherwise, reduce the offset by a fixed factor times the time constant.
@@ -204,10 +203,10 @@ static inline void pps_fill_timex(struct ntp_data *ntpdata, struct __kernel_time
 		txc->jitter = ntpdata->pps_jitter / NSEC_PER_USEC;
 	txc->shift	   = ntpdata->pps_shift;
 	txc->stabil	   = ntpdata->pps_stabil;
-	txc->jitcnt	   = pps_jitcnt;
-	txc->calcnt	   = pps_calcnt;
-	txc->errcnt	   = pps_errcnt;
-	txc->stbcnt	   = pps_stbcnt;
+	txc->jitcnt	   = ntpdata->pps_jitcnt;
+	txc->calcnt	   = ntpdata->pps_calcnt;
+	txc->errcnt	   = ntpdata->pps_errcnt;
+	txc->stbcnt	   = ntpdata->pps_stbcnt;
 }
 
 #else /* !CONFIG_NTP_PPS */
@@ -935,7 +934,7 @@ static long hardpps_update_freq(struct ntp_data *ntpdata, struct pps_normtime fr
 	/* Check if the frequency interval was too long */
 	if (freq_norm.sec > (2 << ntpdata->pps_shift)) {
 		ntpdata->time_status |= STA_PPSERROR;
-		pps_errcnt++;
+		ntpdata->pps_errcnt++;
 		pps_dec_freq_interval(ntpdata);
 		printk_deferred(KERN_ERR "hardpps: PPSERROR: interval too long - %lld s\n",
 				freq_norm.sec);
@@ -954,7 +953,7 @@ static long hardpps_update_freq(struct ntp_data *ntpdata, struct pps_normtime fr
 	if (delta > PPS_MAXWANDER || delta < -PPS_MAXWANDER) {
 		printk_deferred(KERN_WARNING "hardpps: PPSWANDER: change=%ld\n", delta);
 		ntpdata->time_status |= STA_PPSWANDER;
-		pps_stbcnt++;
+		ntpdata->pps_stbcnt++;
 		pps_dec_freq_interval(ntpdata);
 	} else {
 		/* Good sample */
@@ -999,7 +998,7 @@ static void hardpps_update_phase(struct ntp_data *ntpdata, long error)
 		printk_deferred(KERN_WARNING "hardpps: PPSJITTER: jitter=%ld, limit=%ld\n",
 				jitter, (ntpdata->pps_jitter << PPS_POPCORN));
 		ntpdata->time_status |= STA_PPSJITTER;
-		pps_jitcnt++;
+		ntpdata->pps_jitcnt++;
 	} else if (ntpdata->time_status & STA_PPSTIME) {
 		/* Correct the time using the phase offset */
 		ntpdata->time_offset = div_s64(((s64)correction) << NTP_SCALE_SHIFT,
@@ -1064,7 +1063,7 @@ void __hardpps(const struct timespec64 *phase_ts, const struct timespec64 *raw_t
 
 	/* Signal is ok. Check if the current frequency interval is finished */
 	if (freq_norm.sec >= (1 << ntpdata->pps_shift)) {
-		pps_calcnt++;
+		ntpdata->pps_calcnt++;
 		/* Restart the frequency calibration interval */
 		ntpdata->pps_fbase = *raw_ts;
 		hardpps_update_freq(ntpdata, freq_norm);

-- 
2.39.2

Re: [PATCH 06/21] ntp: Read reference time only once

[John Stultz]

On Wed, Sep 11, 2024 at 6:18 AM Anna-Maria Behnsen
<anna-maria@linutronix.de> wrote:
>
> From: Thomas Gleixner <tglx@linutronix.de>
>
> The reference time is required twice in ntp_update_offset(). It will not
> change in the meantime as the calling code holds the timekeeper lock. Read
> it only once and store it into a local variable.
>
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>
> ---

Nice!
Acked-by: John Stultz <jstultz@google.com>

thanks
-john

Re: [PATCH 01/21] ntp: Remove unused tick_nsec

[John Stultz]

On Wed, Sep 11, 2024 at 6:17 AM Anna-Maria Behnsen
<anna-maria@linutronix.de> wrote:
>
> From: Thomas Gleixner <tglx@linutronix.de>
>
> tick_nsec is only updated in the NTP core, but there are no users.
>
> Remove it.
>
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>

Thanks for the cleanup!

It would be nice to point to when/why the users were removed, but from
some quick archeology I didn't find a single insightful change, just a
number of places realizing they weren't using their references to it
and dropping it bit by bit.

Acked-by: John Stultz <jstultz@google.com>

thanks
-john

Re: [PATCH 03/21] ntp: Clean up comments

[John Stultz]

On Wed, Sep 11, 2024 at 6:17 AM Anna-Maria Behnsen
<anna-maria@linutronix.de> wrote:
>
> From: Thomas Gleixner <tglx@linutronix.de>
>
> Usage of different comment formatting makes fast reading and parsing the
> code harder. There are several multi-line comments which do not follow the
> coding style by starting with a line only containing '/*'. There are also
> comments which do not start with capitals.
>
> Clean up all those comments to be consistent and remove comments which
> document the obvious.
>
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>

Acked-by: John Stultz <jstultz@google.com>

Thanks for the cleanup!
-john

Re: [PATCH 04/21] ntp: Cleanup formatting of code

[John Stultz]

On Wed, Sep 11, 2024 at 6:17 AM Anna-Maria Behnsen
<anna-maria@linutronix.de> wrote:
>
> Code is partially formatted in a creative way which makes reading
> harder. Examples are function calls over several lines where the
> indentation does not start at the same height then the open bracket after
> the function name.
>
> Improve formatting but do not make a functional change.
>
> Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>

Acked-by: John Stultz <jstultz@google.com>

thanks
-john

Re: [PATCH 05/21] ntp: Convert functions with only two states to bool

[John Stultz]

On Wed, Sep 11, 2024 at 6:18 AM Anna-Maria Behnsen
<anna-maria@linutronix.de> wrote:
>
> From: Thomas Gleixner <tglx@linutronix.de>
>
> is_error_status() and ntp_synced() return whether a state is set or
> not. Both functions use unsigned int for it even if it would be a perfect
> job for a bool.
>
> Use bool instead of unsigned int. And while at it, move ntp_synced()
> function to the place where it is used.
>
> No functional change.
>
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>

Acked-by: John Stultz <jstultz@google.com>

thanks
-john

Re: [PATCH 07/21] ntp: Introduce struct ntp_data

[John Stultz]

On Wed, Sep 11, 2024 at 6:18 AM Anna-Maria Behnsen
<anna-maria@linutronix.de> wrote:
>
> From: Thomas Gleixner <tglx@linutronix.de>
>
> All NTP data is held in static variables. That prevents the NTP code from
> being reuasble for non-system time timekeepers, e.g. per PTP clock
> timekeeping.
>
> Introduce struct ntp_data and move tick_usec into it for a start.
>
> No functional change.
>
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>

Acked-by: John Stultz <jstultz@google.com>

thanks
-john

Re: [PATCH 08/21] ntp: Move tick_length* into ntp_data

[John Stultz]

On Wed, Sep 11, 2024 at 6:18 AM Anna-Maria Behnsen
<anna-maria@linutronix.de> wrote:
>
> From: Thomas Gleixner <tglx@linutronix.de>
>
> Continue the conversion from static variables to struct based data.
>
> No functional change.
>
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>

Acked-by: John Stultz <jstultz@google.com>

thanks
-john

Re: [PATCH 09/21] ntp: Move tick_stat* into ntp_data

[John Stultz]

On Wed, Sep 11, 2024 at 6:18 AM Anna-Maria Behnsen
<anna-maria@linutronix.de> wrote:
>
> From: Thomas Gleixner <tglx@linutronix.de>
>
> Continue the conversion from static variables to struct based data.
>
> No functional change.
>
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>

No objection on this, but I wonder if it might be worth dropping the
time_ prefix when you've moved the fields into the ntp_data structure?

Otherwise,
Acked-by: John Stultz <jstultz@google.com>

thanks
-john

Re: [PATCH 10/21] ntp: Move time_offset/constant into ntp_data

[John Stultz]

On Wed, Sep 11, 2024 at 6:18 AM Anna-Maria Behnsen
<anna-maria@linutronix.de> wrote:
>
> From: Thomas Gleixner <tglx@linutronix.de>
>
> Continue the conversion from static variables to struct based data.
>
> No functional change.
>
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>

Same optional suggestion on dropping the time_ prefix, otherwise:

Acked-by: John Stultz <jstultz@google.com>

thanks
-john

Re: [PATCH 02/21] ntp: Make tick_usec static

[John Stultz]

On Wed, Sep 11, 2024 at 6:17 AM Anna-Maria Behnsen
<anna-maria@linutronix.de> wrote:
>
> From: Thomas Gleixner <tglx@linutronix.de>
>
> There are no users of tick_usec outside of the NTP core code. Therefore
> make tick_usec static.
>
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>

Acked-by: John Stultz <jstultz@google.com>

thanks
-john

Re: [PATCH 12/21] ntp: Move time_freq/reftime into ntp_data

[John Stultz]

On Wed, Sep 11, 2024 at 6:18 AM Anna-Maria Behnsen
<anna-maria@linutronix.de> wrote:
>
> From: Thomas Gleixner <tglx@linutronix.de>
>
> Continue the conversion from static variables to struct based data.
>
> No functional change.
>
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>

Acked-by: John Stultz <jstultz@google.com>

thanks
-john

Re: [PATCH 13/21] ntp: Move time_adj/ntp_tick_adj into ntp_data

[John Stultz]

On Wed, Sep 11, 2024 at 6:18 AM Anna-Maria Behnsen
<anna-maria@linutronix.de> wrote:
>
> From: Thomas Gleixner <tglx@linutronix.de>
>
> Continue the conversion from static variables to struct based data.
>
> No functional change.
>
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>

Running out of steam to review them all closely, but they look sane
and simple, so for the rest of this set:
Acked-by: John Stultz <jstultz@google.com>

thanks
-john

Re: [PATCH 00/21] ntp: Rework to prepare support of indenpendent PTP clocks

[Miroslav Lichvar]

On Wed, Sep 11, 2024 at 03:17:36PM +0200, Anna-Maria Behnsen wrote:
> This problem can be solved by emulating clock_gettime() via the system
> clock source e.g. TSC on x86. Such emulation requires:
> 
> 1. timekeeping mechanism similar to the existing system timekeeping
> 2. clock steering equivalent to NTP/adjtimex()

I'm trying to understand what independent PTP clocks means here. Is
the goal to provide virtual PTP clocks running on top of the system
clocksource (e.g. TSC) similarly to what is currently done for
physical PTP clocks by writing to /sys/class/ptp/ptp*/n_vclocks,
expecting the virtual clocks to be synchronized by applications like
phc2sys?

Or is this more about speeding up the reading of the PHC, where the
kernel itself would be tracking the offset using one of the PTP
driver's PTP_SYS_OFFSET operations and emulating a fast-reading PHC?

-- 
Miroslav Lichvar

Re: [PATCH 00/21] ntp: Rework to prepare support of indenpendent PTP clocks

[Richard Cochran]

On Thu, Sep 12, 2024 at 10:12:59AM +0200, Miroslav Lichvar wrote:
> I'm trying to understand what independent PTP clocks means here.

Me, too.

It is not easy to see where this is going...

Thanks,
Richard

Re: [PATCH 00/21] ntp: Rework to prepare support of indenpendent PTP clocks

[Anna-Maria Behnsen]

Miroslav Lichvar <mlichvar@redhat.com> writes:

> On Wed, Sep 11, 2024 at 03:17:36PM +0200, Anna-Maria Behnsen wrote:
>> This problem can be solved by emulating clock_gettime() via the system
>> clock source e.g. TSC on x86. Such emulation requires:
>> 
>> 1. timekeeping mechanism similar to the existing system timekeeping
>> 2. clock steering equivalent to NTP/adjtimex()
>
> I'm trying to understand what independent PTP clocks means here. Is
> the goal to provide virtual PTP clocks running on top of the system
> clocksource (e.g. TSC) similarly to what is currently done for
> physical PTP clocks by writing to /sys/class/ptp/ptp*/n_vclocks,
> expecting the virtual clocks to be synchronized by applications like
> phc2sys?
>
> Or is this more about speeding up the reading of the PHC, where the
> kernel itself would be tracking the offset using one of the PTP
> driver's PTP_SYS_OFFSET operations and emulating a fast-reading PHC?

That's one aspect.

The independant PTP clocks are PTP clocks which are not synchronized
with CLOCK_TAI. They are "standalone". They are used in automation and
automotive setups. They have a grand clock master which is not
synchronized to anything. There are also requirements for redundant
networks where the clocks are not allowed to be synchronized between the
networks to prevent common cause failures.

These clocks are used for TSN and both applications and the network
stack needs to be able to read the time. Going through the file
decriptor based interfaces is slow and not possible in the kernel.

The goal is to provide infrastructure which allows these clocks to be
read via kernel interfaces and clock_gettime(PTPID) by emulating the
clock via the system clocksource (e.g. TSC).

That means they need timekeeping and steering infrastructure, to keep
them in sync with the PHC. It's the identical mechanism to what system
timekeeping and NTP do for the system clocks.

So instead of creating duplicate infrastructure, this aims to reuse the
existing one.

Hope this helps to make it more clear.

Thanks,

        Anna-Maria