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ntp/pps: use timespec64 for hardpps()

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There is only one user of the hardpps function in the kernel, so
it makes sense to atomically change it over to using 64-bit
timestamps for y2038 safety. In the hardpps implementation,
we also need to change the pps_normtime structure, which is
similar to struct timespec and also requires a 64-bit
seconds portion.

This introduces two temporary variables in pps_kc_event() to
do the conversion, they will be removed again in the next step,
which seemed preferable to having a larger patch changing it
all at the same time.

Acked-by: Richard Cochran <richardcochran@gmail.com>
Acked-by: David S. Miller <davem@davemloft.net>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: John Stultz <john.stultz@linaro.org>
This commit is contained in:
Arnd Bergmann 2015-09-28 22:21:28 +02:00 committed by John Stultz
parent 9ffecb1028
commit 7ec88e4be4
5 changed files with 12 additions and 10 deletions
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4
drivers/pps/kc.c
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@ -113,10 +113,12 @@ void pps_kc_event(struct pps_device *pps, struct pps_event_time *ts,
int event)
{
unsigned long flags;
struct timespec64 real = timespec_to_timespec64(ts->ts_real);
struct timespec64 raw = timespec_to_timespec64(ts->ts_raw);
/* Pass some events to kernel consumer if activated */
spin_lock_irqsave(&pps_kc_hardpps_lock, flags);
if (pps == pps_kc_hardpps_dev && event & pps_kc_hardpps_mode)
hardpps(&ts->ts_real, &ts->ts_raw);
hardpps(&real, &raw);
spin_unlock_irqrestore(&pps_kc_hardpps_lock, flags);
}

2
include/linux/timex.h
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@ -152,7 +152,7 @@ extern unsigned long tick_nsec; /* SHIFTED_HZ period (nsec) */
#define NTP_INTERVAL_LENGTH (NSEC_PER_SEC/NTP_INTERVAL_FREQ)
extern int do_adjtimex(struct timex *);
extern void hardpps(const struct timespec *, const struct timespec *);
extern void hardpps(const struct timespec64 *, const struct timespec64 *);
int read_current_timer(unsigned long *timer_val);
void ntp_notify_cmos_timer(void);

12
kernel/time/ntp.c
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@ -99,7 +99,7 @@ static time64_t ntp_next_leap_sec = TIME64_MAX;
static int pps_valid; /* signal watchdog counter */
static long pps_tf[3]; /* phase median filter */
static long pps_jitter; /* current jitter (ns) */
static struct timespec pps_fbase; /* beginning of the last freq interval */
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) */
@ -773,13 +773,13 @@ int __do_adjtimex(struct timex *txc, struct timespec64 *ts, s32 *time_tai)
* 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) */
struct pps_normtime {
__kernel_time_t sec; /* seconds */
s64 sec; /* seconds */
long nsec; /* nanoseconds */
};
/* 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 timespec ts)
static inline struct pps_normtime pps_normalize_ts(struct timespec64 ts)
{
struct pps_normtime norm = {
.sec = ts.tv_sec,
@ -861,7 +861,7 @@ static long hardpps_update_freq(struct pps_normtime freq_norm)
pps_errcnt++;
pps_dec_freq_interval();
printk_deferred(KERN_ERR
"hardpps: PPSERROR: interval too long - %ld s\n",
"hardpps: PPSERROR: interval too long - %lld s\n",
freq_norm.sec);
return 0;
}
@ -948,7 +948,7 @@ static void hardpps_update_phase(long error)
* This code is based on David Mills's reference nanokernel
* implementation. It was mostly rewritten but keeps the same idea.
*/
void __hardpps(const struct timespec *phase_ts, const struct timespec *raw_ts)
void __hardpps(const struct timespec64 *phase_ts, const struct timespec64 *raw_ts)
{
struct pps_normtime pts_norm, freq_norm;
@ -969,7 +969,7 @@ void __hardpps(const struct timespec *phase_ts, const struct timespec *raw_ts)
}
/* ok, now we have a base for frequency calculation */
freq_norm = pps_normalize_ts(timespec_sub(*raw_ts, pps_fbase));
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 */

2
kernel/time/ntp_internal.h
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@ -9,5 +9,5 @@ extern ktime_t ntp_get_next_leap(void);
extern int second_overflow(unsigned long secs);
extern int ntp_validate_timex(struct timex *);
extern int __do_adjtimex(struct timex *, struct timespec64 *, s32 *);
extern void __hardpps(const struct timespec *, const struct timespec *);
extern void __hardpps(const struct timespec64 *, const struct timespec64 *);
#endif /* _LINUX_NTP_INTERNAL_H */

2
kernel/time/timekeeping.c
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@ -2025,7 +2025,7 @@ int do_adjtimex(struct timex *txc)
/**
* hardpps() - Accessor function to NTP __hardpps function
*/
void hardpps(const struct timespec *phase_ts, const struct timespec *raw_ts)
void hardpps(const struct timespec64 *phase_ts, const struct timespec64 *raw_ts)
{
unsigned long flags;