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Couple of items for 3.20

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* ktime division optimization
 * Expose a few more y2038-safe timekeeping interfaces
 * RTC core changes to address y2038
 
 Signed-off-by: John Stultz <john.stultz@linaro.org>
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Merge tag 'fortglx-3.20-time' of https://git.linaro.org/people/john.stultz/linux into timers/core

Pull time updates from John Stultz for 3.20:

 * ktime division optimization
 * Expose a few more y2038-safe timekeeping interfaces
 * RTC core changes to address y2038
This commit is contained in:
Thomas Gleixner 2015-01-24 10:11:12 +01:00
commit fe31fca35d
10 changed files with 63 additions and 46 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
drivers/rtc/hctosys.c
View File

@ -26,7 +26,7 @@ static int __init rtc_hctosys(void)
{
int err = -ENODEV;
struct rtc_time tm;
struct timespec tv = {
struct timespec64 tv64 = {
.tv_nsec = NSEC_PER_SEC >> 1,
};
struct rtc_device *rtc = rtc_class_open(CONFIG_RTC_HCTOSYS_DEVICE);
@ -45,25 +45,17 @@ static int __init rtc_hctosys(void)
}
err = rtc_valid_tm(&tm);
if (err) {
dev_err(rtc->dev.parent,
"hctosys: invalid date/time\n");
goto err_invalid;
}
tv64.tv_sec = rtc_tm_to_time64(&tm);
rtc_tm_to_time(&tm, &tv.tv_sec);
err = do_settimeofday(&tv);
err = do_settimeofday64(&tv64);
dev_info(rtc->dev.parent,
"setting system clock to "
"%d-%02d-%02d %02d:%02d:%02d UTC (%u)\n",
"%d-%02d-%02d %02d:%02d:%02d UTC (%lld)\n",
tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
tm.tm_hour, tm.tm_min, tm.tm_sec,
(unsigned int) tv.tv_sec);
(long long) tv64.tv_sec);
err_invalid:
err_read:
rtc_class_close(rtc);

22
drivers/rtc/interface.c
View File

@ -73,10 +73,8 @@ int rtc_set_time(struct rtc_device *rtc, struct rtc_time *tm)
else if (rtc->ops->set_time)
err = rtc->ops->set_time(rtc->dev.parent, tm);
else if (rtc->ops->set_mmss) {
unsigned long secs;
err = rtc_tm_to_time(tm, &secs);
if (err == 0)
err = rtc->ops->set_mmss(rtc->dev.parent, secs);
time64_t secs64 = rtc_tm_to_time64(tm);
err = rtc->ops->set_mmss(rtc->dev.parent, secs64);
} else
err = -EINVAL;
@ -105,7 +103,7 @@ int rtc_set_mmss(struct rtc_device *rtc, unsigned long secs)
err = rtc->ops->read_time(rtc->dev.parent, &old);
if (err == 0) {
rtc_time_to_tm(secs, &new);
rtc_time64_to_tm(secs, &new);
/*
* avoid writing when we're going to change the day of
@ -157,7 +155,7 @@ int __rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
int err;
struct rtc_time before, now;
int first_time = 1;
unsigned long t_now, t_alm;
time64_t t_now, t_alm;
enum { none, day, month, year } missing = none;
unsigned days;
@ -258,8 +256,8 @@ int __rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
}
/* with luck, no rollover is needed */
rtc_tm_to_time(&now, &t_now);
rtc_tm_to_time(&alarm->time, &t_alm);
t_now = rtc_tm_to_time64(&now);
t_alm = rtc_tm_to_time64(&alarm->time);
if (t_now < t_alm)
goto done;
@ -273,7 +271,7 @@ int __rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
case day:
dev_dbg(&rtc->dev, "alarm rollover: %s\n", "day");
t_alm += 24 * 60 * 60;
rtc_time_to_tm(t_alm, &alarm->time);
rtc_time64_to_tm(t_alm, &alarm->time);
break;
/* Month rollover ... if it's the 31th, an alarm on the 3rd will
@ -346,19 +344,19 @@ EXPORT_SYMBOL_GPL(rtc_read_alarm);
static int __rtc_set_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
{
struct rtc_time tm;
long now, scheduled;
time64_t now, scheduled;
int err;
err = rtc_valid_tm(&alarm->time);
if (err)
return err;
rtc_tm_to_time(&alarm->time, &scheduled);
scheduled = rtc_tm_to_time64(&alarm->time);
/* Make sure we're not setting alarms in the past */
err = __rtc_read_time(rtc, &tm);
if (err)
return err;
rtc_tm_to_time(&tm, &now);
now = rtc_tm_to_time64(&tm);
if (scheduled <= now)
return -ETIME;
/*

8
drivers/rtc/rtc-dev.c
View File

@ -304,12 +304,12 @@ static long rtc_dev_ioctl(struct file *file,
* Not supported here.
*/
{
unsigned long now, then;
time64_t now, then;
err = rtc_read_time(rtc, &tm);
if (err < 0)
return err;
rtc_tm_to_time(&tm, &now);
now = rtc_tm_to_time64(&tm);
alarm.time.tm_mday = tm.tm_mday;
alarm.time.tm_mon = tm.tm_mon;
@ -317,11 +317,11 @@ static long rtc_dev_ioctl(struct file *file,
err = rtc_valid_tm(&alarm.time);
if (err < 0)
return err;
rtc_tm_to_time(&alarm.time, &then);
then = rtc_tm_to_time64(&alarm.time);
/* alarm may need to wrap into tomorrow */
if (then < now) {
rtc_time_to_tm(now + 24 * 60 * 60, &tm);
rtc_time64_to_tm(now + 24 * 60 * 60, &tm);
alarm.time.tm_mday = tm.tm_mday;
alarm.time.tm_mon = tm.tm_mon;
alarm.time.tm_year = tm.tm_year;

6
drivers/rtc/systohc.c
View File

@ -20,16 +20,16 @@
*
* If temporary failure is indicated the caller should try again 'soon'
*/
int rtc_set_ntp_time(struct timespec now)
int rtc_set_ntp_time(struct timespec64 now)
{
struct rtc_device *rtc;
struct rtc_time tm;
int err = -ENODEV;
if (now.tv_nsec < (NSEC_PER_SEC >> 1))
rtc_time_to_tm(now.tv_sec, &tm);
rtc_time64_to_tm(now.tv_sec, &tm);
else
rtc_time_to_tm(now.tv_sec + 1, &tm);
rtc_time64_to_tm(now.tv_sec + 1, &tm);
rtc = rtc_class_open(CONFIG_RTC_HCTOSYS_DEVICE);
if (rtc) {

12
include/linux/ktime.h
View File

@ -166,7 +166,17 @@ static inline bool ktime_before(const ktime_t cmp1, const ktime_t cmp2)
}
#if BITS_PER_LONG < 64
extern u64 ktime_divns(const ktime_t kt, s64 div);
extern u64 __ktime_divns(const ktime_t kt, s64 div);
static inline u64 ktime_divns(const ktime_t kt, s64 div)
{
if (__builtin_constant_p(div) && !(div >> 32)) {
u64 ns = kt.tv64;
do_div(ns, div);
return ns;
} else {
return __ktime_divns(kt, div);
}
}
#else /* BITS_PER_LONG < 64 */
# define ktime_divns(kt, div) (u64)((kt).tv64 / (div))
#endif

2
include/linux/rtc.h
View File

@ -161,7 +161,7 @@ extern void devm_rtc_device_unregister(struct device *dev,
extern int rtc_read_time(struct rtc_device *rtc, struct rtc_time *tm);
extern int rtc_set_time(struct rtc_device *rtc, struct rtc_time *tm);
extern int rtc_set_mmss(struct rtc_device *rtc, unsigned long secs);
extern int rtc_set_ntp_time(struct timespec now);
extern int rtc_set_ntp_time(struct timespec64 now);
int __rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm);
extern int rtc_read_alarm(struct rtc_device *rtc,
struct rtc_wkalrm *alrm);

21
include/linux/timekeeping.h
View File

@ -33,6 +33,7 @@ extern time64_t ktime_get_real_seconds(void);
extern int __getnstimeofday64(struct timespec64 *tv);
extern void getnstimeofday64(struct timespec64 *tv);
extern void getboottime64(struct timespec64 *ts);
#if BITS_PER_LONG == 64
/**
@ -72,6 +73,11 @@ static inline struct timespec get_monotonic_coarse(void)
{
return get_monotonic_coarse64();
}
static inline void getboottime(struct timespec *ts)
{
return getboottime64(ts);
}
#else
/**
* Deprecated. Use do_settimeofday64().
@ -129,9 +135,15 @@ static inline struct timespec get_monotonic_coarse(void)
{
return timespec64_to_timespec(get_monotonic_coarse64());
}
#endif
extern void getboottime(struct timespec *ts);
static inline void getboottime(struct timespec *ts)
{
struct timespec64 ts64;
getboottime64(&ts64);
*ts = timespec64_to_timespec(ts64);
}
#endif
#define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts)
#define ktime_get_real_ts64(ts) getnstimeofday64(ts)
@ -217,6 +229,11 @@ static inline void get_monotonic_boottime(struct timespec *ts)
*ts = ktime_to_timespec(ktime_get_boottime());
}
static inline void get_monotonic_boottime64(struct timespec64 *ts)
{
*ts = ktime_to_timespec64(ktime_get_boottime());
}
static inline void timekeeping_clocktai(struct timespec *ts)
{
*ts = ktime_to_timespec(ktime_get_clocktai());

4
kernel/time/hrtimer.c
View File

@ -266,7 +266,7 @@ lock_hrtimer_base(const struct hrtimer *timer, unsigned long *flags)
/*
* Divide a ktime value by a nanosecond value
*/
u64 ktime_divns(const ktime_t kt, s64 div)
u64 __ktime_divns(const ktime_t kt, s64 div)
{
u64 dclc;
int sft = 0;
@ -282,7 +282,7 @@ u64 ktime_divns(const ktime_t kt, s64 div)
return dclc;
}
EXPORT_SYMBOL_GPL(ktime_divns);
EXPORT_SYMBOL_GPL(__ktime_divns);
#endif /* BITS_PER_LONG >= 64 */
/*

4
kernel/time/ntp.c
View File

@ -488,13 +488,13 @@ static void sync_cmos_clock(struct work_struct *work)
getnstimeofday64(&now);
if (abs(now.tv_nsec - (NSEC_PER_SEC / 2)) <= tick_nsec * 5) {
struct timespec adjust = timespec64_to_timespec(now);
struct timespec64 adjust = now;
fail = -ENODEV;
if (persistent_clock_is_local)
adjust.tv_sec -= (sys_tz.tz_minuteswest * 60);
#ifdef CONFIG_GENERIC_CMOS_UPDATE
fail = update_persistent_clock(adjust);
fail = update_persistent_clock(timespec64_to_timespec(adjust));
#endif
#ifdef CONFIG_RTC_SYSTOHC
if (fail == -ENODEV)

12
kernel/time/timekeeping.c
View File

@ -1659,24 +1659,24 @@ void update_wall_time(void)
}
/**
* getboottime - Return the real time of system boot.
* @ts: pointer to the timespec to be set
* getboottime64 - Return the real time of system boot.
* @ts: pointer to the timespec64 to be set
*
* Returns the wall-time of boot in a timespec.
* Returns the wall-time of boot in a timespec64.
*
* This is based on the wall_to_monotonic offset and the total suspend
* time. Calls to settimeofday will affect the value returned (which
* basically means that however wrong your real time clock is at boot time,
* you get the right time here).
*/
void getboottime(struct timespec *ts)
void getboottime64(struct timespec64 *ts)
{
struct timekeeper *tk = &tk_core.timekeeper;
ktime_t t = ktime_sub(tk->offs_real, tk->offs_boot);
*ts = ktime_to_timespec(t);
*ts = ktime_to_timespec64(t);
}
EXPORT_SYMBOL_GPL(getboottime);
EXPORT_SYMBOL_GPL(getboottime64);
unsigned long get_seconds(void)
{