4 * Copyright (C) 1991, 1992 Linus Torvalds
6 * This file contains the interface functions for the various
7 * time related system calls: time, stime, gettimeofday, settimeofday,
11 * Modification history kernel/time.c
13 * 1993-09-02 Philip Gladstone
14 * Created file with time related functions from sched/core.c and adjtimex()
15 * 1993-10-08 Torsten Duwe
16 * adjtime interface update and CMOS clock write code
17 * 1995-08-13 Torsten Duwe
18 * kernel PLL updated to 1994-12-13 specs (rfc-1589)
19 * 1999-01-16 Ulrich Windl
20 * Introduced error checking for many cases in adjtimex().
21 * Updated NTP code according to technical memorandum Jan '96
22 * "A Kernel Model for Precision Timekeeping" by Dave Mills
23 * Allow time_constant larger than MAXTC(6) for NTP v4 (MAXTC == 10)
24 * (Even though the technical memorandum forbids it)
25 * 2004-07-14 Christoph Lameter
26 * Added getnstimeofday to allow the posix timer functions to return
27 * with nanosecond accuracy
30 #include <linux/export.h>
31 #include <linux/kernel.h>
32 #include <linux/timex.h>
33 #include <linux/capability.h>
34 #include <linux/timekeeper_internal.h>
35 #include <linux/errno.h>
36 #include <linux/syscalls.h>
37 #include <linux/security.h>
39 #include <linux/math64.h>
40 #include <linux/ptrace.h>
42 #include <linux/uaccess.h>
43 #include <linux/compat.h>
44 #include <asm/unistd.h>
46 #include <generated/timeconst.h>
47 #include "timekeeping.h"
50 * The timezone where the local system is located. Used as a default by some
51 * programs who obtain this value by using gettimeofday.
53 struct timezone sys_tz;
55 EXPORT_SYMBOL(sys_tz);
57 #ifdef __ARCH_WANT_SYS_TIME
60 * sys_time() can be implemented in user-level using
61 * sys_gettimeofday(). Is this for backwards compatibility? If so,
62 * why not move it into the appropriate arch directory (for those
63 * architectures that need it).
65 SYSCALL_DEFINE1(time, time_t __user *, tloc)
67 time_t i = get_seconds();
73 force_successful_syscall_return();
78 * sys_stime() can be implemented in user-level using
79 * sys_settimeofday(). Is this for backwards compatibility? If so,
80 * why not move it into the appropriate arch directory (for those
81 * architectures that need it).
84 SYSCALL_DEFINE1(stime, time_t __user *, tptr)
89 if (get_user(tv.tv_sec, tptr))
94 err = security_settime64(&tv, NULL);
98 do_settimeofday64(&tv);
102 #endif /* __ARCH_WANT_SYS_TIME */
105 #ifdef __ARCH_WANT_COMPAT_SYS_TIME
107 /* compat_time_t is a 32 bit "long" and needs to get converted. */
108 COMPAT_SYSCALL_DEFINE1(time, compat_time_t __user *, tloc)
113 do_gettimeofday(&tv);
117 if (put_user(i,tloc))
120 force_successful_syscall_return();
124 COMPAT_SYSCALL_DEFINE1(stime, compat_time_t __user *, tptr)
126 struct timespec64 tv;
129 if (get_user(tv.tv_sec, tptr))
134 err = security_settime64(&tv, NULL);
138 do_settimeofday64(&tv);
142 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */
145 SYSCALL_DEFINE2(gettimeofday, struct timeval __user *, tv,
146 struct timezone __user *, tz)
148 if (likely(tv != NULL)) {
150 do_gettimeofday(&ktv);
151 if (copy_to_user(tv, &ktv, sizeof(ktv)))
154 if (unlikely(tz != NULL)) {
155 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
162 * In case for some reason the CMOS clock has not already been running
163 * in UTC, but in some local time: The first time we set the timezone,
164 * we will warp the clock so that it is ticking UTC time instead of
165 * local time. Presumably, if someone is setting the timezone then we
166 * are running in an environment where the programs understand about
167 * timezones. This should be done at boot time in the /etc/rc script,
168 * as soon as possible, so that the clock can be set right. Otherwise,
169 * various programs will get confused when the clock gets warped.
172 int do_sys_settimeofday64(const struct timespec64 *tv, const struct timezone *tz)
174 static int firsttime = 1;
177 if (tv && !timespec64_valid(tv))
180 error = security_settime64(tv, tz);
185 /* Verify we're witin the +-15 hrs range */
186 if (tz->tz_minuteswest > 15*60 || tz->tz_minuteswest < -15*60)
190 update_vsyscall_tz();
194 timekeeping_warp_clock();
198 return do_settimeofday64(tv);
202 SYSCALL_DEFINE2(settimeofday, struct timeval __user *, tv,
203 struct timezone __user *, tz)
205 struct timespec64 new_ts;
206 struct timeval user_tv;
207 struct timezone new_tz;
210 if (copy_from_user(&user_tv, tv, sizeof(*tv)))
213 if (!timeval_valid(&user_tv))
216 new_ts.tv_sec = user_tv.tv_sec;
217 new_ts.tv_nsec = user_tv.tv_usec * NSEC_PER_USEC;
220 if (copy_from_user(&new_tz, tz, sizeof(*tz)))
224 return do_sys_settimeofday64(tv ? &new_ts : NULL, tz ? &new_tz : NULL);
228 COMPAT_SYSCALL_DEFINE2(gettimeofday, struct compat_timeval __user *, tv,
229 struct timezone __user *, tz)
234 do_gettimeofday(&ktv);
235 if (compat_put_timeval(&ktv, tv))
239 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
246 COMPAT_SYSCALL_DEFINE2(settimeofday, struct compat_timeval __user *, tv,
247 struct timezone __user *, tz)
249 struct timespec64 new_ts;
250 struct timeval user_tv;
251 struct timezone new_tz;
254 if (compat_get_timeval(&user_tv, tv))
256 new_ts.tv_sec = user_tv.tv_sec;
257 new_ts.tv_nsec = user_tv.tv_usec * NSEC_PER_USEC;
260 if (copy_from_user(&new_tz, tz, sizeof(*tz)))
264 return do_sys_settimeofday64(tv ? &new_ts : NULL, tz ? &new_tz : NULL);
268 SYSCALL_DEFINE1(adjtimex, struct timex __user *, txc_p)
270 struct timex txc; /* Local copy of parameter */
273 /* Copy the user data space into the kernel copy
274 * structure. But bear in mind that the structures
277 if (copy_from_user(&txc, txc_p, sizeof(struct timex)))
279 ret = do_adjtimex(&txc);
280 return copy_to_user(txc_p, &txc, sizeof(struct timex)) ? -EFAULT : ret;
285 COMPAT_SYSCALL_DEFINE1(adjtimex, struct compat_timex __user *, utp)
290 err = compat_get_timex(&txc, utp);
294 ret = do_adjtimex(&txc);
296 err = compat_put_timex(utp, &txc);
305 * Convert jiffies to milliseconds and back.
307 * Avoid unnecessary multiplications/divisions in the
308 * two most common HZ cases:
310 unsigned int jiffies_to_msecs(const unsigned long j)
312 #if HZ <= MSEC_PER_SEC && !(MSEC_PER_SEC % HZ)
313 return (MSEC_PER_SEC / HZ) * j;
314 #elif HZ > MSEC_PER_SEC && !(HZ % MSEC_PER_SEC)
315 return (j + (HZ / MSEC_PER_SEC) - 1)/(HZ / MSEC_PER_SEC);
317 # if BITS_PER_LONG == 32
318 return (HZ_TO_MSEC_MUL32 * j + (1ULL << HZ_TO_MSEC_SHR32) - 1) >>
321 return DIV_ROUND_UP(j * HZ_TO_MSEC_NUM, HZ_TO_MSEC_DEN);
325 EXPORT_SYMBOL(jiffies_to_msecs);
327 unsigned int jiffies_to_usecs(const unsigned long j)
330 * Hz usually doesn't go much further MSEC_PER_SEC.
331 * jiffies_to_usecs() and usecs_to_jiffies() depend on that.
333 BUILD_BUG_ON(HZ > USEC_PER_SEC);
335 #if !(USEC_PER_SEC % HZ)
336 return (USEC_PER_SEC / HZ) * j;
338 # if BITS_PER_LONG == 32
339 return (HZ_TO_USEC_MUL32 * j) >> HZ_TO_USEC_SHR32;
341 return (j * HZ_TO_USEC_NUM) / HZ_TO_USEC_DEN;
345 EXPORT_SYMBOL(jiffies_to_usecs);
348 * timespec_trunc - Truncate timespec to a granularity
350 * @gran: Granularity in ns.
352 * Truncate a timespec to a granularity. Always rounds down. gran must
353 * not be 0 nor greater than a second (NSEC_PER_SEC, or 10^9 ns).
355 struct timespec timespec_trunc(struct timespec t, unsigned gran)
357 /* Avoid division in the common cases 1 ns and 1 s. */
360 } else if (gran == NSEC_PER_SEC) {
362 } else if (gran > 1 && gran < NSEC_PER_SEC) {
363 t.tv_nsec -= t.tv_nsec % gran;
365 WARN(1, "illegal file time granularity: %u", gran);
369 EXPORT_SYMBOL(timespec_trunc);
372 * mktime64 - Converts date to seconds.
373 * Converts Gregorian date to seconds since 1970-01-01 00:00:00.
374 * Assumes input in normal date format, i.e. 1980-12-31 23:59:59
375 * => year=1980, mon=12, day=31, hour=23, min=59, sec=59.
377 * [For the Julian calendar (which was used in Russia before 1917,
378 * Britain & colonies before 1752, anywhere else before 1582,
379 * and is still in use by some communities) leave out the
380 * -year/100+year/400 terms, and add 10.]
382 * This algorithm was first published by Gauss (I think).
384 * A leap second can be indicated by calling this function with sec as
385 * 60 (allowable under ISO 8601). The leap second is treated the same
386 * as the following second since they don't exist in UNIX time.
388 * An encoding of midnight at the end of the day as 24:00:00 - ie. midnight
389 * tomorrow - (allowable under ISO 8601) is supported.
391 time64_t mktime64(const unsigned int year0, const unsigned int mon0,
392 const unsigned int day, const unsigned int hour,
393 const unsigned int min, const unsigned int sec)
395 unsigned int mon = mon0, year = year0;
397 /* 1..12 -> 11,12,1..10 */
398 if (0 >= (int) (mon -= 2)) {
399 mon += 12; /* Puts Feb last since it has leap day */
404 (year/4 - year/100 + year/400 + 367*mon/12 + day) +
406 )*24 + hour /* now have hours - midnight tomorrow handled here */
407 )*60 + min /* now have minutes */
408 )*60 + sec; /* finally seconds */
410 EXPORT_SYMBOL(mktime64);
413 * set_normalized_timespec - set timespec sec and nsec parts and normalize
415 * @ts: pointer to timespec variable to be set
416 * @sec: seconds to set
417 * @nsec: nanoseconds to set
419 * Set seconds and nanoseconds field of a timespec variable and
420 * normalize to the timespec storage format
422 * Note: The tv_nsec part is always in the range of
423 * 0 <= tv_nsec < NSEC_PER_SEC
424 * For negative values only the tv_sec field is negative !
426 void set_normalized_timespec(struct timespec *ts, time_t sec, s64 nsec)
428 while (nsec >= NSEC_PER_SEC) {
430 * The following asm() prevents the compiler from
431 * optimising this loop into a modulo operation. See
432 * also __iter_div_u64_rem() in include/linux/time.h
434 asm("" : "+rm"(nsec));
435 nsec -= NSEC_PER_SEC;
439 asm("" : "+rm"(nsec));
440 nsec += NSEC_PER_SEC;
446 EXPORT_SYMBOL(set_normalized_timespec);
449 * ns_to_timespec - Convert nanoseconds to timespec
450 * @nsec: the nanoseconds value to be converted
452 * Returns the timespec representation of the nsec parameter.
454 struct timespec ns_to_timespec(const s64 nsec)
460 return (struct timespec) {0, 0};
462 ts.tv_sec = div_s64_rem(nsec, NSEC_PER_SEC, &rem);
463 if (unlikely(rem < 0)) {
471 EXPORT_SYMBOL(ns_to_timespec);
474 * ns_to_timeval - Convert nanoseconds to timeval
475 * @nsec: the nanoseconds value to be converted
477 * Returns the timeval representation of the nsec parameter.
479 struct timeval ns_to_timeval(const s64 nsec)
481 struct timespec ts = ns_to_timespec(nsec);
484 tv.tv_sec = ts.tv_sec;
485 tv.tv_usec = (suseconds_t) ts.tv_nsec / 1000;
489 EXPORT_SYMBOL(ns_to_timeval);
491 struct __kernel_old_timeval ns_to_kernel_old_timeval(const s64 nsec)
493 struct timespec64 ts = ns_to_timespec64(nsec);
494 struct __kernel_old_timeval tv;
496 tv.tv_sec = ts.tv_sec;
497 tv.tv_usec = (suseconds_t)ts.tv_nsec / 1000;
501 EXPORT_SYMBOL(ns_to_kernel_old_timeval);
504 * set_normalized_timespec - set timespec sec and nsec parts and normalize
506 * @ts: pointer to timespec variable to be set
507 * @sec: seconds to set
508 * @nsec: nanoseconds to set
510 * Set seconds and nanoseconds field of a timespec variable and
511 * normalize to the timespec storage format
513 * Note: The tv_nsec part is always in the range of
514 * 0 <= tv_nsec < NSEC_PER_SEC
515 * For negative values only the tv_sec field is negative !
517 void set_normalized_timespec64(struct timespec64 *ts, time64_t sec, s64 nsec)
519 while (nsec >= NSEC_PER_SEC) {
521 * The following asm() prevents the compiler from
522 * optimising this loop into a modulo operation. See
523 * also __iter_div_u64_rem() in include/linux/time.h
525 asm("" : "+rm"(nsec));
526 nsec -= NSEC_PER_SEC;
530 asm("" : "+rm"(nsec));
531 nsec += NSEC_PER_SEC;
537 EXPORT_SYMBOL(set_normalized_timespec64);
540 * ns_to_timespec64 - Convert nanoseconds to timespec64
541 * @nsec: the nanoseconds value to be converted
543 * Returns the timespec64 representation of the nsec parameter.
545 struct timespec64 ns_to_timespec64(const s64 nsec)
547 struct timespec64 ts;
551 return (struct timespec64) {0, 0};
553 ts.tv_sec = div_s64_rem(nsec, NSEC_PER_SEC, &rem);
554 if (unlikely(rem < 0)) {
562 EXPORT_SYMBOL(ns_to_timespec64);
565 * msecs_to_jiffies: - convert milliseconds to jiffies
566 * @m: time in milliseconds
568 * conversion is done as follows:
570 * - negative values mean 'infinite timeout' (MAX_JIFFY_OFFSET)
572 * - 'too large' values [that would result in larger than
573 * MAX_JIFFY_OFFSET values] mean 'infinite timeout' too.
575 * - all other values are converted to jiffies by either multiplying
576 * the input value by a factor or dividing it with a factor and
577 * handling any 32-bit overflows.
578 * for the details see __msecs_to_jiffies()
580 * msecs_to_jiffies() checks for the passed in value being a constant
581 * via __builtin_constant_p() allowing gcc to eliminate most of the
582 * code, __msecs_to_jiffies() is called if the value passed does not
583 * allow constant folding and the actual conversion must be done at
585 * the _msecs_to_jiffies helpers are the HZ dependent conversion
586 * routines found in include/linux/jiffies.h
588 unsigned long __msecs_to_jiffies(const unsigned int m)
591 * Negative value, means infinite timeout:
594 return MAX_JIFFY_OFFSET;
595 return _msecs_to_jiffies(m);
597 EXPORT_SYMBOL(__msecs_to_jiffies);
599 unsigned long __usecs_to_jiffies(const unsigned int u)
601 if (u > jiffies_to_usecs(MAX_JIFFY_OFFSET))
602 return MAX_JIFFY_OFFSET;
603 return _usecs_to_jiffies(u);
605 EXPORT_SYMBOL(__usecs_to_jiffies);
608 * The TICK_NSEC - 1 rounds up the value to the next resolution. Note
609 * that a remainder subtract here would not do the right thing as the
610 * resolution values don't fall on second boundries. I.e. the line:
611 * nsec -= nsec % TICK_NSEC; is NOT a correct resolution rounding.
612 * Note that due to the small error in the multiplier here, this
613 * rounding is incorrect for sufficiently large values of tv_nsec, but
614 * well formed timespecs should have tv_nsec < NSEC_PER_SEC, so we're
617 * Rather, we just shift the bits off the right.
619 * The >> (NSEC_JIFFIE_SC - SEC_JIFFIE_SC) converts the scaled nsec
620 * value to a scaled second value.
623 __timespec64_to_jiffies(u64 sec, long nsec)
625 nsec = nsec + TICK_NSEC - 1;
627 if (sec >= MAX_SEC_IN_JIFFIES){
628 sec = MAX_SEC_IN_JIFFIES;
631 return ((sec * SEC_CONVERSION) +
632 (((u64)nsec * NSEC_CONVERSION) >>
633 (NSEC_JIFFIE_SC - SEC_JIFFIE_SC))) >> SEC_JIFFIE_SC;
638 __timespec_to_jiffies(unsigned long sec, long nsec)
640 return __timespec64_to_jiffies((u64)sec, nsec);
644 timespec64_to_jiffies(const struct timespec64 *value)
646 return __timespec64_to_jiffies(value->tv_sec, value->tv_nsec);
648 EXPORT_SYMBOL(timespec64_to_jiffies);
651 jiffies_to_timespec64(const unsigned long jiffies, struct timespec64 *value)
654 * Convert jiffies to nanoseconds and separate with
658 value->tv_sec = div_u64_rem((u64)jiffies * TICK_NSEC,
660 value->tv_nsec = rem;
662 EXPORT_SYMBOL(jiffies_to_timespec64);
665 * We could use a similar algorithm to timespec_to_jiffies (with a
666 * different multiplier for usec instead of nsec). But this has a
667 * problem with rounding: we can't exactly add TICK_NSEC - 1 to the
668 * usec value, since it's not necessarily integral.
670 * We could instead round in the intermediate scaled representation
671 * (i.e. in units of 1/2^(large scale) jiffies) but that's also
672 * perilous: the scaling introduces a small positive error, which
673 * combined with a division-rounding-upward (i.e. adding 2^(scale) - 1
674 * units to the intermediate before shifting) leads to accidental
675 * overflow and overestimates.
677 * At the cost of one additional multiplication by a constant, just
678 * use the timespec implementation.
681 timeval_to_jiffies(const struct timeval *value)
683 return __timespec_to_jiffies(value->tv_sec,
684 value->tv_usec * NSEC_PER_USEC);
686 EXPORT_SYMBOL(timeval_to_jiffies);
688 void jiffies_to_timeval(const unsigned long jiffies, struct timeval *value)
691 * Convert jiffies to nanoseconds and separate with
696 value->tv_sec = div_u64_rem((u64)jiffies * TICK_NSEC,
698 value->tv_usec = rem / NSEC_PER_USEC;
700 EXPORT_SYMBOL(jiffies_to_timeval);
703 * Convert jiffies/jiffies_64 to clock_t and back.
705 clock_t jiffies_to_clock_t(unsigned long x)
707 #if (TICK_NSEC % (NSEC_PER_SEC / USER_HZ)) == 0
709 return x * (USER_HZ / HZ);
711 return x / (HZ / USER_HZ);
714 return div_u64((u64)x * TICK_NSEC, NSEC_PER_SEC / USER_HZ);
717 EXPORT_SYMBOL(jiffies_to_clock_t);
719 unsigned long clock_t_to_jiffies(unsigned long x)
721 #if (HZ % USER_HZ)==0
722 if (x >= ~0UL / (HZ / USER_HZ))
724 return x * (HZ / USER_HZ);
726 /* Don't worry about loss of precision here .. */
727 if (x >= ~0UL / HZ * USER_HZ)
730 /* .. but do try to contain it here */
731 return div_u64((u64)x * HZ, USER_HZ);
734 EXPORT_SYMBOL(clock_t_to_jiffies);
736 u64 jiffies_64_to_clock_t(u64 x)
738 #if (TICK_NSEC % (NSEC_PER_SEC / USER_HZ)) == 0
740 x = div_u64(x * USER_HZ, HZ);
742 x = div_u64(x, HZ / USER_HZ);
748 * There are better ways that don't overflow early,
749 * but even this doesn't overflow in hundreds of years
752 x = div_u64(x * TICK_NSEC, (NSEC_PER_SEC / USER_HZ));
756 EXPORT_SYMBOL(jiffies_64_to_clock_t);
758 u64 nsec_to_clock_t(u64 x)
760 #if (NSEC_PER_SEC % USER_HZ) == 0
761 return div_u64(x, NSEC_PER_SEC / USER_HZ);
762 #elif (USER_HZ % 512) == 0
763 return div_u64(x * USER_HZ / 512, NSEC_PER_SEC / 512);
766 * max relative error 5.7e-8 (1.8s per year) for USER_HZ <= 1024,
767 * overflow after 64.99 years.
768 * exact for HZ=60, 72, 90, 120, 144, 180, 300, 600, 900, ...
770 return div_u64(x * 9, (9ull * NSEC_PER_SEC + (USER_HZ / 2)) / USER_HZ);
774 u64 jiffies64_to_nsecs(u64 j)
776 #if !(NSEC_PER_SEC % HZ)
777 return (NSEC_PER_SEC / HZ) * j;
779 return div_u64(j * HZ_TO_NSEC_NUM, HZ_TO_NSEC_DEN);
782 EXPORT_SYMBOL(jiffies64_to_nsecs);
785 * nsecs_to_jiffies64 - Convert nsecs in u64 to jiffies64
789 * Unlike {m,u}secs_to_jiffies, type of input is not unsigned int but u64.
790 * And this doesn't return MAX_JIFFY_OFFSET since this function is designed
791 * for scheduler, not for use in device drivers to calculate timeout value.
794 * NSEC_PER_SEC = 10^9 = (5^9 * 2^9) = (1953125 * 512)
795 * ULLONG_MAX ns = 18446744073.709551615 secs = about 584 years
797 u64 nsecs_to_jiffies64(u64 n)
799 #if (NSEC_PER_SEC % HZ) == 0
800 /* Common case, HZ = 100, 128, 200, 250, 256, 500, 512, 1000 etc. */
801 return div_u64(n, NSEC_PER_SEC / HZ);
802 #elif (HZ % 512) == 0
803 /* overflow after 292 years if HZ = 1024 */
804 return div_u64(n * HZ / 512, NSEC_PER_SEC / 512);
807 * Generic case - optimized for cases where HZ is a multiple of 3.
808 * overflow after 64.99 years, exact for HZ = 60, 72, 90, 120 etc.
810 return div_u64(n * 9, (9ull * NSEC_PER_SEC + HZ / 2) / HZ);
813 EXPORT_SYMBOL(nsecs_to_jiffies64);
816 * nsecs_to_jiffies - Convert nsecs in u64 to jiffies
820 * Unlike {m,u}secs_to_jiffies, type of input is not unsigned int but u64.
821 * And this doesn't return MAX_JIFFY_OFFSET since this function is designed
822 * for scheduler, not for use in device drivers to calculate timeout value.
825 * NSEC_PER_SEC = 10^9 = (5^9 * 2^9) = (1953125 * 512)
826 * ULLONG_MAX ns = 18446744073.709551615 secs = about 584 years
828 unsigned long nsecs_to_jiffies(u64 n)
830 return (unsigned long)nsecs_to_jiffies64(n);
832 EXPORT_SYMBOL_GPL(nsecs_to_jiffies);
835 * Add two timespec64 values and do a safety check for overflow.
836 * It's assumed that both values are valid (>= 0).
837 * And, each timespec64 is in normalized form.
839 struct timespec64 timespec64_add_safe(const struct timespec64 lhs,
840 const struct timespec64 rhs)
842 struct timespec64 res;
844 set_normalized_timespec64(&res, (timeu64_t) lhs.tv_sec + rhs.tv_sec,
845 lhs.tv_nsec + rhs.tv_nsec);
847 if (unlikely(res.tv_sec < lhs.tv_sec || res.tv_sec < rhs.tv_sec)) {
848 res.tv_sec = TIME64_MAX;
855 int get_timespec64(struct timespec64 *ts,
856 const struct __kernel_timespec __user *uts)
858 struct __kernel_timespec kts;
861 ret = copy_from_user(&kts, uts, sizeof(kts));
865 ts->tv_sec = kts.tv_sec;
867 /* Zero out the padding for 32 bit systems or in compat mode */
868 if (IS_ENABLED(CONFIG_64BIT_TIME) && (!IS_ENABLED(CONFIG_64BIT) || in_compat_syscall()))
869 kts.tv_nsec &= 0xFFFFFFFFUL;
871 ts->tv_nsec = kts.tv_nsec;
875 EXPORT_SYMBOL_GPL(get_timespec64);
877 int put_timespec64(const struct timespec64 *ts,
878 struct __kernel_timespec __user *uts)
880 struct __kernel_timespec kts = {
881 .tv_sec = ts->tv_sec,
882 .tv_nsec = ts->tv_nsec
885 return copy_to_user(uts, &kts, sizeof(kts)) ? -EFAULT : 0;
887 EXPORT_SYMBOL_GPL(put_timespec64);
889 int __compat_get_timespec64(struct timespec64 *ts64,
890 const struct compat_timespec __user *cts)
892 struct compat_timespec ts;
895 ret = copy_from_user(&ts, cts, sizeof(ts));
899 ts64->tv_sec = ts.tv_sec;
900 ts64->tv_nsec = ts.tv_nsec;
905 int __compat_put_timespec64(const struct timespec64 *ts64,
906 struct compat_timespec __user *cts)
908 struct compat_timespec ts = {
909 .tv_sec = ts64->tv_sec,
910 .tv_nsec = ts64->tv_nsec
912 return copy_to_user(cts, &ts, sizeof(ts)) ? -EFAULT : 0;
915 int compat_get_timespec64(struct timespec64 *ts, const void __user *uts)
917 if (COMPAT_USE_64BIT_TIME)
918 return copy_from_user(ts, uts, sizeof(*ts)) ? -EFAULT : 0;
920 return __compat_get_timespec64(ts, uts);
922 EXPORT_SYMBOL_GPL(compat_get_timespec64);
924 int compat_put_timespec64(const struct timespec64 *ts, void __user *uts)
926 if (COMPAT_USE_64BIT_TIME)
927 return copy_to_user(uts, ts, sizeof(*ts)) ? -EFAULT : 0;
929 return __compat_put_timespec64(ts, uts);
931 EXPORT_SYMBOL_GPL(compat_put_timespec64);
933 int get_itimerspec64(struct itimerspec64 *it,
934 const struct itimerspec __user *uit)
938 ret = get_timespec64(&it->it_interval, &uit->it_interval);
942 ret = get_timespec64(&it->it_value, &uit->it_value);
946 EXPORT_SYMBOL_GPL(get_itimerspec64);
948 int put_itimerspec64(const struct itimerspec64 *it,
949 struct itimerspec __user *uit)
953 ret = put_timespec64(&it->it_interval, &uit->it_interval);
957 ret = put_timespec64(&it->it_value, &uit->it_value);
961 EXPORT_SYMBOL_GPL(put_itimerspec64);