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![John Stultz](/assets/img/avatar_default.png)
Kay Sievers noted that the ALWAYS_USE_PERSISTENT_CLOCK config, which enables some minor compile time optimization to avoid uncessary code in mostly the suspend/resume path could cause problems for userland. In particular, the dependency for RTC_HCTOSYS on !ALWAYS_USE_PERSISTENT_CLOCK, which avoids setting the time twice and simplifies suspend/resume, has the side effect of causing the /sys/class/rtc/rtcN/hctosys flag to always be zero, and this flag is commonly used by udev to setup the /dev/rtc symlink to /dev/rtcN, which can cause pain for older applications. While the udev rules could use some work to be less fragile, breaking userland should strongly be avoided. Additionally the compile time optimizations are fairly minor, and the code being optimized is likely to be reworked in the future, so lets revert this change. Reported-by: Kay Sievers <kay@vrfy.org> Signed-off-by: John Stultz <john.stultz@linaro.org> Cc: stable <stable@vger.kernel.org> #3.9 Cc: Feng Tang <feng.tang@intel.com> Cc: Jason Gunthorpe <jgunthorpe@obsidianresearch.com> Link: http://lkml.kernel.org/r/1366828376-18124-1-git-send-email-john.stultz@linaro.org Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
270 lines
8.1 KiB
C
270 lines
8.1 KiB
C
#ifndef _LINUX_TIME_H
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#define _LINUX_TIME_H
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# include <linux/cache.h>
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# include <linux/seqlock.h>
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# include <linux/math64.h>
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#include <uapi/linux/time.h>
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extern struct timezone sys_tz;
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/* Parameters used to convert the timespec values: */
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#define MSEC_PER_SEC 1000L
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#define USEC_PER_MSEC 1000L
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#define NSEC_PER_USEC 1000L
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#define NSEC_PER_MSEC 1000000L
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#define USEC_PER_SEC 1000000L
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#define NSEC_PER_SEC 1000000000L
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#define FSEC_PER_SEC 1000000000000000LL
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#define TIME_T_MAX (time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1)
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static inline int timespec_equal(const struct timespec *a,
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const struct timespec *b)
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{
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return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec);
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}
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/*
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* lhs < rhs: return <0
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* lhs == rhs: return 0
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* lhs > rhs: return >0
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*/
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static inline int timespec_compare(const struct timespec *lhs, const struct timespec *rhs)
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{
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if (lhs->tv_sec < rhs->tv_sec)
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return -1;
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if (lhs->tv_sec > rhs->tv_sec)
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return 1;
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return lhs->tv_nsec - rhs->tv_nsec;
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}
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static inline int timeval_compare(const struct timeval *lhs, const struct timeval *rhs)
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{
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if (lhs->tv_sec < rhs->tv_sec)
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return -1;
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if (lhs->tv_sec > rhs->tv_sec)
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return 1;
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return lhs->tv_usec - rhs->tv_usec;
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}
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extern unsigned long mktime(const unsigned int year, const unsigned int mon,
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const unsigned int day, const unsigned int hour,
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const unsigned int min, const unsigned int sec);
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extern void set_normalized_timespec(struct timespec *ts, time_t sec, s64 nsec);
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/*
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* timespec_add_safe assumes both values are positive and checks
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* for overflow. It will return TIME_T_MAX if the reutrn would be
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* smaller then either of the arguments.
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*/
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extern struct timespec timespec_add_safe(const struct timespec lhs,
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const struct timespec rhs);
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static inline struct timespec timespec_add(struct timespec lhs,
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struct timespec rhs)
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{
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struct timespec ts_delta;
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set_normalized_timespec(&ts_delta, lhs.tv_sec + rhs.tv_sec,
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lhs.tv_nsec + rhs.tv_nsec);
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return ts_delta;
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}
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/*
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* sub = lhs - rhs, in normalized form
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*/
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static inline struct timespec timespec_sub(struct timespec lhs,
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struct timespec rhs)
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{
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struct timespec ts_delta;
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set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec,
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lhs.tv_nsec - rhs.tv_nsec);
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return ts_delta;
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}
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#define KTIME_MAX ((s64)~((u64)1 << 63))
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#if (BITS_PER_LONG == 64)
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# define KTIME_SEC_MAX (KTIME_MAX / NSEC_PER_SEC)
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#else
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# define KTIME_SEC_MAX LONG_MAX
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#endif
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/*
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* Returns true if the timespec is norm, false if denorm:
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*/
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static inline bool timespec_valid(const struct timespec *ts)
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{
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/* Dates before 1970 are bogus */
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if (ts->tv_sec < 0)
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return false;
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/* Can't have more nanoseconds then a second */
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if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC)
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return false;
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return true;
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}
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static inline bool timespec_valid_strict(const struct timespec *ts)
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{
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if (!timespec_valid(ts))
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return false;
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/* Disallow values that could overflow ktime_t */
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if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX)
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return false;
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return true;
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}
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extern bool persistent_clock_exist;
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static inline bool has_persistent_clock(void)
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{
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return persistent_clock_exist;
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}
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extern void read_persistent_clock(struct timespec *ts);
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extern void read_boot_clock(struct timespec *ts);
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extern int persistent_clock_is_local;
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extern int update_persistent_clock(struct timespec now);
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void timekeeping_init(void);
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extern int timekeeping_suspended;
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unsigned long get_seconds(void);
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struct timespec current_kernel_time(void);
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struct timespec __current_kernel_time(void); /* does not take xtime_lock */
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struct timespec get_monotonic_coarse(void);
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void get_xtime_and_monotonic_and_sleep_offset(struct timespec *xtim,
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struct timespec *wtom, struct timespec *sleep);
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void timekeeping_inject_sleeptime(struct timespec *delta);
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#define CURRENT_TIME (current_kernel_time())
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#define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 })
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/* Some architectures do not supply their own clocksource.
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* This is mainly the case in architectures that get their
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* inter-tick times by reading the counter on their interval
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* timer. Since these timers wrap every tick, they're not really
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* useful as clocksources. Wrapping them to act like one is possible
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* but not very efficient. So we provide a callout these arches
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* can implement for use with the jiffies clocksource to provide
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* finer then tick granular time.
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*/
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#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
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extern u32 (*arch_gettimeoffset)(void);
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#endif
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extern void do_gettimeofday(struct timeval *tv);
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extern int do_settimeofday(const struct timespec *tv);
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extern int do_sys_settimeofday(const struct timespec *tv,
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const struct timezone *tz);
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#define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts)
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extern long do_utimes(int dfd, const char __user *filename, struct timespec *times, int flags);
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struct itimerval;
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extern int do_setitimer(int which, struct itimerval *value,
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struct itimerval *ovalue);
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extern unsigned int alarm_setitimer(unsigned int seconds);
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extern int do_getitimer(int which, struct itimerval *value);
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extern int __getnstimeofday(struct timespec *tv);
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extern void getnstimeofday(struct timespec *tv);
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extern void getrawmonotonic(struct timespec *ts);
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extern void getnstime_raw_and_real(struct timespec *ts_raw,
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struct timespec *ts_real);
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extern void getboottime(struct timespec *ts);
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extern void monotonic_to_bootbased(struct timespec *ts);
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extern void get_monotonic_boottime(struct timespec *ts);
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extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
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extern int timekeeping_valid_for_hres(void);
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extern u64 timekeeping_max_deferment(void);
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extern int timekeeping_inject_offset(struct timespec *ts);
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extern s32 timekeeping_get_tai_offset(void);
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extern void timekeeping_set_tai_offset(s32 tai_offset);
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extern void timekeeping_clocktai(struct timespec *ts);
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struct tms;
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extern void do_sys_times(struct tms *);
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/*
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* Similar to the struct tm in userspace <time.h>, but it needs to be here so
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* that the kernel source is self contained.
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*/
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struct tm {
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/*
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* the number of seconds after the minute, normally in the range
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* 0 to 59, but can be up to 60 to allow for leap seconds
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*/
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int tm_sec;
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/* the number of minutes after the hour, in the range 0 to 59*/
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int tm_min;
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/* the number of hours past midnight, in the range 0 to 23 */
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int tm_hour;
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/* the day of the month, in the range 1 to 31 */
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int tm_mday;
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/* the number of months since January, in the range 0 to 11 */
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int tm_mon;
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/* the number of years since 1900 */
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long tm_year;
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/* the number of days since Sunday, in the range 0 to 6 */
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int tm_wday;
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/* the number of days since January 1, in the range 0 to 365 */
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int tm_yday;
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};
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void time_to_tm(time_t totalsecs, int offset, struct tm *result);
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/**
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* timespec_to_ns - Convert timespec to nanoseconds
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* @ts: pointer to the timespec variable to be converted
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*
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* Returns the scalar nanosecond representation of the timespec
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* parameter.
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*/
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static inline s64 timespec_to_ns(const struct timespec *ts)
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{
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return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
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}
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/**
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* timeval_to_ns - Convert timeval to nanoseconds
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* @ts: pointer to the timeval variable to be converted
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*
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* Returns the scalar nanosecond representation of the timeval
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* parameter.
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*/
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static inline s64 timeval_to_ns(const struct timeval *tv)
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{
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return ((s64) tv->tv_sec * NSEC_PER_SEC) +
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tv->tv_usec * NSEC_PER_USEC;
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}
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/**
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* ns_to_timespec - Convert nanoseconds to timespec
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* @nsec: the nanoseconds value to be converted
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*
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* Returns the timespec representation of the nsec parameter.
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*/
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extern struct timespec ns_to_timespec(const s64 nsec);
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/**
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* ns_to_timeval - Convert nanoseconds to timeval
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* @nsec: the nanoseconds value to be converted
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*
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* Returns the timeval representation of the nsec parameter.
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*/
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extern struct timeval ns_to_timeval(const s64 nsec);
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/**
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* timespec_add_ns - Adds nanoseconds to a timespec
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* @a: pointer to timespec to be incremented
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* @ns: unsigned nanoseconds value to be added
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*
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* This must always be inlined because its used from the x86-64 vdso,
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* which cannot call other kernel functions.
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*/
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static __always_inline void timespec_add_ns(struct timespec *a, u64 ns)
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{
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a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns);
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a->tv_nsec = ns;
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}
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#endif
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