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 = (time_t)ktime_get_real_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)
112 i = (compat_time_t)ktime_get_real_seconds();
115 if (put_user(i,tloc))
118 force_successful_syscall_return();
122 COMPAT_SYSCALL_DEFINE1(stime, compat_time_t __user *, tptr)
124 struct timespec64 tv;
127 if (get_user(tv.tv_sec, tptr))
132 err = security_settime64(&tv, NULL);
136 do_settimeofday64(&tv);
140 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */
143 SYSCALL_DEFINE2(gettimeofday, struct timeval __user *, tv,
144 struct timezone __user *, tz)
146 if (likely(tv != NULL)) {
147 struct timespec64 ts;
149 ktime_get_real_ts64(&ts);
150 if (put_user(ts.tv_sec, &tv->tv_sec) ||
151 put_user(ts.tv_nsec / 1000, &tv->tv_usec))
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_settod(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)
232 struct timespec64 ts;
234 ktime_get_real_ts64(&ts);
235 if (put_user(ts.tv_sec, &tv->tv_sec) ||
236 put_user(ts.tv_nsec / 1000, &tv->tv_usec))
240 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
247 COMPAT_SYSCALL_DEFINE2(settimeofday, struct compat_timeval __user *, tv,
248 struct timezone __user *, tz)
250 struct timespec64 new_ts;
251 struct timeval user_tv;
252 struct timezone new_tz;
255 if (compat_get_timeval(&user_tv, tv))
257 new_ts.tv_sec = user_tv.tv_sec;
258 new_ts.tv_nsec = user_tv.tv_usec * NSEC_PER_USEC;
261 if (copy_from_user(&new_tz, tz, sizeof(*tz)))
265 return do_sys_settimeofday64(tv ? &new_ts : NULL, tz ? &new_tz : NULL);
269 SYSCALL_DEFINE1(adjtimex, struct timex __user *, txc_p)
271 struct timex txc; /* Local copy of parameter */
274 /* Copy the user data space into the kernel copy
275 * structure. But bear in mind that the structures
278 if (copy_from_user(&txc, txc_p, sizeof(struct timex)))
280 ret = do_adjtimex(&txc);
281 return copy_to_user(txc_p, &txc, sizeof(struct timex)) ? -EFAULT : ret;
286 COMPAT_SYSCALL_DEFINE1(adjtimex, struct compat_timex __user *, utp)
291 err = compat_get_timex(&txc, utp);
295 ret = do_adjtimex(&txc);
297 err = compat_put_timex(utp, &txc);
306 * Convert jiffies to milliseconds and back.
308 * Avoid unnecessary multiplications/divisions in the
309 * two most common HZ cases:
311 unsigned int jiffies_to_msecs(const unsigned long j)
313 #if HZ <= MSEC_PER_SEC && !(MSEC_PER_SEC % HZ)
314 return (MSEC_PER_SEC / HZ) * j;
315 #elif HZ > MSEC_PER_SEC && !(HZ % MSEC_PER_SEC)
316 return (j + (HZ / MSEC_PER_SEC) - 1)/(HZ / MSEC_PER_SEC);
318 # if BITS_PER_LONG == 32
319 return (HZ_TO_MSEC_MUL32 * j + (1ULL << HZ_TO_MSEC_SHR32) - 1) >>
322 return DIV_ROUND_UP(j * HZ_TO_MSEC_NUM, HZ_TO_MSEC_DEN);
326 EXPORT_SYMBOL(jiffies_to_msecs);
328 unsigned int jiffies_to_usecs(const unsigned long j)
331 * Hz usually doesn't go much further MSEC_PER_SEC.
332 * jiffies_to_usecs() and usecs_to_jiffies() depend on that.
334 BUILD_BUG_ON(HZ > USEC_PER_SEC);
336 #if !(USEC_PER_SEC % HZ)
337 return (USEC_PER_SEC / HZ) * j;
339 # if BITS_PER_LONG == 32
340 return (HZ_TO_USEC_MUL32 * j) >> HZ_TO_USEC_SHR32;
342 return (j * HZ_TO_USEC_NUM) / HZ_TO_USEC_DEN;
346 EXPORT_SYMBOL(jiffies_to_usecs);
349 * timespec_trunc - Truncate timespec to a granularity
351 * @gran: Granularity in ns.
353 * Truncate a timespec to a granularity. Always rounds down. gran must
354 * not be 0 nor greater than a second (NSEC_PER_SEC, or 10^9 ns).
356 struct timespec timespec_trunc(struct timespec t, unsigned gran)
358 /* Avoid division in the common cases 1 ns and 1 s. */
361 } else if (gran == NSEC_PER_SEC) {
363 } else if (gran > 1 && gran < NSEC_PER_SEC) {
364 t.tv_nsec -= t.tv_nsec % gran;
366 WARN(1, "illegal file time granularity: %u", gran);
370 EXPORT_SYMBOL(timespec_trunc);
373 * mktime64 - Converts date to seconds.
374 * Converts Gregorian date to seconds since 1970-01-01 00:00:00.
375 * Assumes input in normal date format, i.e. 1980-12-31 23:59:59
376 * => year=1980, mon=12, day=31, hour=23, min=59, sec=59.
378 * [For the Julian calendar (which was used in Russia before 1917,
379 * Britain & colonies before 1752, anywhere else before 1582,
380 * and is still in use by some communities) leave out the
381 * -year/100+year/400 terms, and add 10.]
383 * This algorithm was first published by Gauss (I think).
385 * A leap second can be indicated by calling this function with sec as
386 * 60 (allowable under ISO 8601). The leap second is treated the same
387 * as the following second since they don't exist in UNIX time.
389 * An encoding of midnight at the end of the day as 24:00:00 - ie. midnight
390 * tomorrow - (allowable under ISO 8601) is supported.
392 time64_t mktime64(const unsigned int year0, const unsigned int mon0,
393 const unsigned int day, const unsigned int hour,
394 const unsigned int min, const unsigned int sec)
396 unsigned int mon = mon0, year = year0;
398 /* 1..12 -> 11,12,1..10 */
399 if (0 >= (int) (mon -= 2)) {
400 mon += 12; /* Puts Feb last since it has leap day */
405 (year/4 - year/100 + year/400 + 367*mon/12 + day) +
407 )*24 + hour /* now have hours - midnight tomorrow handled here */
408 )*60 + min /* now have minutes */
409 )*60 + sec; /* finally seconds */
411 EXPORT_SYMBOL(mktime64);
414 * set_normalized_timespec - set timespec sec and nsec parts and normalize
416 * @ts: pointer to timespec variable to be set
417 * @sec: seconds to set
418 * @nsec: nanoseconds to set
420 * Set seconds and nanoseconds field of a timespec variable and
421 * normalize to the timespec storage format
423 * Note: The tv_nsec part is always in the range of
424 * 0 <= tv_nsec < NSEC_PER_SEC
425 * For negative values only the tv_sec field is negative !
427 void set_normalized_timespec(struct timespec *ts, time_t sec, s64 nsec)
429 while (nsec >= NSEC_PER_SEC) {
431 * The following asm() prevents the compiler from
432 * optimising this loop into a modulo operation. See
433 * also __iter_div_u64_rem() in include/linux/time.h
435 asm("" : "+rm"(nsec));
436 nsec -= NSEC_PER_SEC;
440 asm("" : "+rm"(nsec));
441 nsec += NSEC_PER_SEC;
447 EXPORT_SYMBOL(set_normalized_timespec);
450 * ns_to_timespec - Convert nanoseconds to timespec
451 * @nsec: the nanoseconds value to be converted
453 * Returns the timespec representation of the nsec parameter.
455 struct timespec ns_to_timespec(const s64 nsec)
461 return (struct timespec) {0, 0};
463 ts.tv_sec = div_s64_rem(nsec, NSEC_PER_SEC, &rem);
464 if (unlikely(rem < 0)) {
472 EXPORT_SYMBOL(ns_to_timespec);
475 * ns_to_timeval - Convert nanoseconds to timeval
476 * @nsec: the nanoseconds value to be converted
478 * Returns the timeval representation of the nsec parameter.
480 struct timeval ns_to_timeval(const s64 nsec)
482 struct timespec ts = ns_to_timespec(nsec);
485 tv.tv_sec = ts.tv_sec;
486 tv.tv_usec = (suseconds_t) ts.tv_nsec / 1000;
490 EXPORT_SYMBOL(ns_to_timeval);
492 struct __kernel_old_timeval ns_to_kernel_old_timeval(const s64 nsec)
494 struct timespec64 ts = ns_to_timespec64(nsec);
495 struct __kernel_old_timeval tv;
497 tv.tv_sec = ts.tv_sec;
498 tv.tv_usec = (suseconds_t)ts.tv_nsec / 1000;
502 EXPORT_SYMBOL(ns_to_kernel_old_timeval);
505 * set_normalized_timespec - set timespec sec and nsec parts and normalize
507 * @ts: pointer to timespec variable to be set
508 * @sec: seconds to set
509 * @nsec: nanoseconds to set
511 * Set seconds and nanoseconds field of a timespec variable and
512 * normalize to the timespec storage format
514 * Note: The tv_nsec part is always in the range of
515 * 0 <= tv_nsec < NSEC_PER_SEC
516 * For negative values only the tv_sec field is negative !
518 void set_normalized_timespec64(struct timespec64 *ts, time64_t sec, s64 nsec)
520 while (nsec >= NSEC_PER_SEC) {
522 * The following asm() prevents the compiler from
523 * optimising this loop into a modulo operation. See
524 * also __iter_div_u64_rem() in include/linux/time.h
526 asm("" : "+rm"(nsec));
527 nsec -= NSEC_PER_SEC;
531 asm("" : "+rm"(nsec));
532 nsec += NSEC_PER_SEC;
538 EXPORT_SYMBOL(set_normalized_timespec64);
541 * ns_to_timespec64 - Convert nanoseconds to timespec64
542 * @nsec: the nanoseconds value to be converted
544 * Returns the timespec64 representation of the nsec parameter.
546 struct timespec64 ns_to_timespec64(const s64 nsec)
548 struct timespec64 ts;
552 return (struct timespec64) {0, 0};
554 ts.tv_sec = div_s64_rem(nsec, NSEC_PER_SEC, &rem);
555 if (unlikely(rem < 0)) {
563 EXPORT_SYMBOL(ns_to_timespec64);
566 * msecs_to_jiffies: - convert milliseconds to jiffies
567 * @m: time in milliseconds
569 * conversion is done as follows:
571 * - negative values mean 'infinite timeout' (MAX_JIFFY_OFFSET)
573 * - 'too large' values [that would result in larger than
574 * MAX_JIFFY_OFFSET values] mean 'infinite timeout' too.
576 * - all other values are converted to jiffies by either multiplying
577 * the input value by a factor or dividing it with a factor and
578 * handling any 32-bit overflows.
579 * for the details see __msecs_to_jiffies()
581 * msecs_to_jiffies() checks for the passed in value being a constant
582 * via __builtin_constant_p() allowing gcc to eliminate most of the
583 * code, __msecs_to_jiffies() is called if the value passed does not
584 * allow constant folding and the actual conversion must be done at
586 * the _msecs_to_jiffies helpers are the HZ dependent conversion
587 * routines found in include/linux/jiffies.h
589 unsigned long __msecs_to_jiffies(const unsigned int m)
592 * Negative value, means infinite timeout:
595 return MAX_JIFFY_OFFSET;
596 return _msecs_to_jiffies(m);
598 EXPORT_SYMBOL(__msecs_to_jiffies);
600 unsigned long __usecs_to_jiffies(const unsigned int u)
602 if (u > jiffies_to_usecs(MAX_JIFFY_OFFSET))
603 return MAX_JIFFY_OFFSET;
604 return _usecs_to_jiffies(u);
606 EXPORT_SYMBOL(__usecs_to_jiffies);
609 * The TICK_NSEC - 1 rounds up the value to the next resolution. Note
610 * that a remainder subtract here would not do the right thing as the
611 * resolution values don't fall on second boundries. I.e. the line:
612 * nsec -= nsec % TICK_NSEC; is NOT a correct resolution rounding.
613 * Note that due to the small error in the multiplier here, this
614 * rounding is incorrect for sufficiently large values of tv_nsec, but
615 * well formed timespecs should have tv_nsec < NSEC_PER_SEC, so we're
618 * Rather, we just shift the bits off the right.
620 * The >> (NSEC_JIFFIE_SC - SEC_JIFFIE_SC) converts the scaled nsec
621 * value to a scaled second value.
624 __timespec64_to_jiffies(u64 sec, long nsec)
626 nsec = nsec + TICK_NSEC - 1;
628 if (sec >= MAX_SEC_IN_JIFFIES){
629 sec = MAX_SEC_IN_JIFFIES;
632 return ((sec * SEC_CONVERSION) +
633 (((u64)nsec * NSEC_CONVERSION) >>
634 (NSEC_JIFFIE_SC - SEC_JIFFIE_SC))) >> SEC_JIFFIE_SC;
639 __timespec_to_jiffies(unsigned long sec, long nsec)
641 return __timespec64_to_jiffies((u64)sec, nsec);
645 timespec64_to_jiffies(const struct timespec64 *value)
647 return __timespec64_to_jiffies(value->tv_sec, value->tv_nsec);
649 EXPORT_SYMBOL(timespec64_to_jiffies);
652 jiffies_to_timespec64(const unsigned long jiffies, struct timespec64 *value)
655 * Convert jiffies to nanoseconds and separate with
659 value->tv_sec = div_u64_rem((u64)jiffies * TICK_NSEC,
661 value->tv_nsec = rem;
663 EXPORT_SYMBOL(jiffies_to_timespec64);
666 * We could use a similar algorithm to timespec_to_jiffies (with a
667 * different multiplier for usec instead of nsec). But this has a
668 * problem with rounding: we can't exactly add TICK_NSEC - 1 to the
669 * usec value, since it's not necessarily integral.
671 * We could instead round in the intermediate scaled representation
672 * (i.e. in units of 1/2^(large scale) jiffies) but that's also
673 * perilous: the scaling introduces a small positive error, which
674 * combined with a division-rounding-upward (i.e. adding 2^(scale) - 1
675 * units to the intermediate before shifting) leads to accidental
676 * overflow and overestimates.
678 * At the cost of one additional multiplication by a constant, just
679 * use the timespec implementation.
682 timeval_to_jiffies(const struct timeval *value)
684 return __timespec_to_jiffies(value->tv_sec,
685 value->tv_usec * NSEC_PER_USEC);
687 EXPORT_SYMBOL(timeval_to_jiffies);
689 void jiffies_to_timeval(const unsigned long jiffies, struct timeval *value)
692 * Convert jiffies to nanoseconds and separate with
697 value->tv_sec = div_u64_rem((u64)jiffies * TICK_NSEC,
699 value->tv_usec = rem / NSEC_PER_USEC;
701 EXPORT_SYMBOL(jiffies_to_timeval);
704 * Convert jiffies/jiffies_64 to clock_t and back.
706 clock_t jiffies_to_clock_t(unsigned long x)
708 #if (TICK_NSEC % (NSEC_PER_SEC / USER_HZ)) == 0
710 return x * (USER_HZ / HZ);
712 return x / (HZ / USER_HZ);
715 return div_u64((u64)x * TICK_NSEC, NSEC_PER_SEC / USER_HZ);
718 EXPORT_SYMBOL(jiffies_to_clock_t);
720 unsigned long clock_t_to_jiffies(unsigned long x)
722 #if (HZ % USER_HZ)==0
723 if (x >= ~0UL / (HZ / USER_HZ))
725 return x * (HZ / USER_HZ);
727 /* Don't worry about loss of precision here .. */
728 if (x >= ~0UL / HZ * USER_HZ)
731 /* .. but do try to contain it here */
732 return div_u64((u64)x * HZ, USER_HZ);
735 EXPORT_SYMBOL(clock_t_to_jiffies);
737 u64 jiffies_64_to_clock_t(u64 x)
739 #if (TICK_NSEC % (NSEC_PER_SEC / USER_HZ)) == 0
741 x = div_u64(x * USER_HZ, HZ);
743 x = div_u64(x, HZ / USER_HZ);
749 * There are better ways that don't overflow early,
750 * but even this doesn't overflow in hundreds of years
753 x = div_u64(x * TICK_NSEC, (NSEC_PER_SEC / USER_HZ));
757 EXPORT_SYMBOL(jiffies_64_to_clock_t);
759 u64 nsec_to_clock_t(u64 x)
761 #if (NSEC_PER_SEC % USER_HZ) == 0
762 return div_u64(x, NSEC_PER_SEC / USER_HZ);
763 #elif (USER_HZ % 512) == 0
764 return div_u64(x * USER_HZ / 512, NSEC_PER_SEC / 512);
767 * max relative error 5.7e-8 (1.8s per year) for USER_HZ <= 1024,
768 * overflow after 64.99 years.
769 * exact for HZ=60, 72, 90, 120, 144, 180, 300, 600, 900, ...
771 return div_u64(x * 9, (9ull * NSEC_PER_SEC + (USER_HZ / 2)) / USER_HZ);
775 u64 jiffies64_to_nsecs(u64 j)
777 #if !(NSEC_PER_SEC % HZ)
778 return (NSEC_PER_SEC / HZ) * j;
780 return div_u64(j * HZ_TO_NSEC_NUM, HZ_TO_NSEC_DEN);
783 EXPORT_SYMBOL(jiffies64_to_nsecs);
786 * nsecs_to_jiffies64 - Convert nsecs in u64 to jiffies64
790 * Unlike {m,u}secs_to_jiffies, type of input is not unsigned int but u64.
791 * And this doesn't return MAX_JIFFY_OFFSET since this function is designed
792 * for scheduler, not for use in device drivers to calculate timeout value.
795 * NSEC_PER_SEC = 10^9 = (5^9 * 2^9) = (1953125 * 512)
796 * ULLONG_MAX ns = 18446744073.709551615 secs = about 584 years
798 u64 nsecs_to_jiffies64(u64 n)
800 #if (NSEC_PER_SEC % HZ) == 0
801 /* Common case, HZ = 100, 128, 200, 250, 256, 500, 512, 1000 etc. */
802 return div_u64(n, NSEC_PER_SEC / HZ);
803 #elif (HZ % 512) == 0
804 /* overflow after 292 years if HZ = 1024 */
805 return div_u64(n * HZ / 512, NSEC_PER_SEC / 512);
808 * Generic case - optimized for cases where HZ is a multiple of 3.
809 * overflow after 64.99 years, exact for HZ = 60, 72, 90, 120 etc.
811 return div_u64(n * 9, (9ull * NSEC_PER_SEC + HZ / 2) / HZ);
814 EXPORT_SYMBOL(nsecs_to_jiffies64);
817 * nsecs_to_jiffies - Convert nsecs in u64 to jiffies
821 * Unlike {m,u}secs_to_jiffies, type of input is not unsigned int but u64.
822 * And this doesn't return MAX_JIFFY_OFFSET since this function is designed
823 * for scheduler, not for use in device drivers to calculate timeout value.
826 * NSEC_PER_SEC = 10^9 = (5^9 * 2^9) = (1953125 * 512)
827 * ULLONG_MAX ns = 18446744073.709551615 secs = about 584 years
829 unsigned long nsecs_to_jiffies(u64 n)
831 return (unsigned long)nsecs_to_jiffies64(n);
833 EXPORT_SYMBOL_GPL(nsecs_to_jiffies);
836 * Add two timespec64 values and do a safety check for overflow.
837 * It's assumed that both values are valid (>= 0).
838 * And, each timespec64 is in normalized form.
840 struct timespec64 timespec64_add_safe(const struct timespec64 lhs,
841 const struct timespec64 rhs)
843 struct timespec64 res;
845 set_normalized_timespec64(&res, (timeu64_t) lhs.tv_sec + rhs.tv_sec,
846 lhs.tv_nsec + rhs.tv_nsec);
848 if (unlikely(res.tv_sec < lhs.tv_sec || res.tv_sec < rhs.tv_sec)) {
849 res.tv_sec = TIME64_MAX;
856 int get_timespec64(struct timespec64 *ts,
857 const struct __kernel_timespec __user *uts)
859 struct __kernel_timespec kts;
862 ret = copy_from_user(&kts, uts, sizeof(kts));
866 ts->tv_sec = kts.tv_sec;
868 /* Zero out the padding for 32 bit systems or in compat mode */
869 if (IS_ENABLED(CONFIG_64BIT_TIME) && (!IS_ENABLED(CONFIG_64BIT) || in_compat_syscall()))
870 kts.tv_nsec &= 0xFFFFFFFFUL;
872 ts->tv_nsec = kts.tv_nsec;
876 EXPORT_SYMBOL_GPL(get_timespec64);
878 int put_timespec64(const struct timespec64 *ts,
879 struct __kernel_timespec __user *uts)
881 struct __kernel_timespec kts = {
882 .tv_sec = ts->tv_sec,
883 .tv_nsec = ts->tv_nsec
886 return copy_to_user(uts, &kts, sizeof(kts)) ? -EFAULT : 0;
888 EXPORT_SYMBOL_GPL(put_timespec64);
890 int __compat_get_timespec64(struct timespec64 *ts64,
891 const struct compat_timespec __user *cts)
893 struct compat_timespec ts;
896 ret = copy_from_user(&ts, cts, sizeof(ts));
900 ts64->tv_sec = ts.tv_sec;
901 ts64->tv_nsec = ts.tv_nsec;
906 int __compat_put_timespec64(const struct timespec64 *ts64,
907 struct compat_timespec __user *cts)
909 struct compat_timespec ts = {
910 .tv_sec = ts64->tv_sec,
911 .tv_nsec = ts64->tv_nsec
913 return copy_to_user(cts, &ts, sizeof(ts)) ? -EFAULT : 0;
916 int compat_get_timespec64(struct timespec64 *ts, const void __user *uts)
918 if (COMPAT_USE_64BIT_TIME)
919 return copy_from_user(ts, uts, sizeof(*ts)) ? -EFAULT : 0;
921 return __compat_get_timespec64(ts, uts);
923 EXPORT_SYMBOL_GPL(compat_get_timespec64);
925 int compat_put_timespec64(const struct timespec64 *ts, void __user *uts)
927 if (COMPAT_USE_64BIT_TIME)
928 return copy_to_user(uts, ts, sizeof(*ts)) ? -EFAULT : 0;
930 return __compat_put_timespec64(ts, uts);
932 EXPORT_SYMBOL_GPL(compat_put_timespec64);
934 int get_itimerspec64(struct itimerspec64 *it,
935 const struct __kernel_itimerspec __user *uit)
939 ret = get_timespec64(&it->it_interval, &uit->it_interval);
943 ret = get_timespec64(&it->it_value, &uit->it_value);
947 EXPORT_SYMBOL_GPL(get_itimerspec64);
949 int put_itimerspec64(const struct itimerspec64 *it,
950 struct __kernel_itimerspec __user *uit)
954 ret = put_timespec64(&it->it_interval, &uit->it_interval);
958 ret = put_timespec64(&it->it_value, &uit->it_value);
962 EXPORT_SYMBOL_GPL(put_itimerspec64);
964 int get_compat_itimerspec64(struct itimerspec64 *its,
965 const struct compat_itimerspec __user *uits)
968 if (__compat_get_timespec64(&its->it_interval, &uits->it_interval) ||
969 __compat_get_timespec64(&its->it_value, &uits->it_value))
973 EXPORT_SYMBOL_GPL(get_compat_itimerspec64);
975 int put_compat_itimerspec64(const struct itimerspec64 *its,
976 struct compat_itimerspec __user *uits)
978 if (__compat_put_timespec64(&its->it_interval, &uits->it_interval) ||
979 __compat_put_timespec64(&its->it_value, &uits->it_value))
983 EXPORT_SYMBOL_GPL(put_compat_itimerspec64);