Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/kernel/time.c |
| 3 | * |
| 4 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 5 | * |
| 6 | * This file contains the interface functions for the various |
| 7 | * time related system calls: time, stime, gettimeofday, settimeofday, |
| 8 | * adjtime |
| 9 | */ |
| 10 | /* |
| 11 | * Modification history kernel/time.c |
| 12 | * |
| 13 | * 1993-09-02 Philip Gladstone |
| 14 | * Created file with time related functions from sched.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 |
| 28 | */ |
| 29 | |
| 30 | #include <linux/module.h> |
| 31 | #include <linux/timex.h> |
Randy.Dunlap | c59ede7 | 2006-01-11 12:17:46 -0800 | [diff] [blame] | 32 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #include <linux/errno.h> |
| 34 | #include <linux/smp_lock.h> |
| 35 | #include <linux/syscalls.h> |
| 36 | #include <linux/security.h> |
| 37 | #include <linux/fs.h> |
| 38 | #include <linux/module.h> |
| 39 | |
| 40 | #include <asm/uaccess.h> |
| 41 | #include <asm/unistd.h> |
| 42 | |
| 43 | /* |
| 44 | * The timezone where the local system is located. Used as a default by some |
| 45 | * programs who obtain this value by using gettimeofday. |
| 46 | */ |
| 47 | struct timezone sys_tz; |
| 48 | |
| 49 | EXPORT_SYMBOL(sys_tz); |
| 50 | |
| 51 | #ifdef __ARCH_WANT_SYS_TIME |
| 52 | |
| 53 | /* |
| 54 | * sys_time() can be implemented in user-level using |
| 55 | * sys_gettimeofday(). Is this for backwards compatibility? If so, |
| 56 | * why not move it into the appropriate arch directory (for those |
| 57 | * architectures that need it). |
| 58 | */ |
| 59 | asmlinkage long sys_time(time_t __user * tloc) |
| 60 | { |
| 61 | time_t i; |
| 62 | struct timeval tv; |
| 63 | |
| 64 | do_gettimeofday(&tv); |
| 65 | i = tv.tv_sec; |
| 66 | |
| 67 | if (tloc) { |
| 68 | if (put_user(i,tloc)) |
| 69 | i = -EFAULT; |
| 70 | } |
| 71 | return i; |
| 72 | } |
| 73 | |
| 74 | /* |
| 75 | * sys_stime() can be implemented in user-level using |
| 76 | * sys_settimeofday(). Is this for backwards compatibility? If so, |
| 77 | * why not move it into the appropriate arch directory (for those |
| 78 | * architectures that need it). |
| 79 | */ |
| 80 | |
| 81 | asmlinkage long sys_stime(time_t __user *tptr) |
| 82 | { |
| 83 | struct timespec tv; |
| 84 | int err; |
| 85 | |
| 86 | if (get_user(tv.tv_sec, tptr)) |
| 87 | return -EFAULT; |
| 88 | |
| 89 | tv.tv_nsec = 0; |
| 90 | |
| 91 | err = security_settime(&tv, NULL); |
| 92 | if (err) |
| 93 | return err; |
| 94 | |
| 95 | do_settimeofday(&tv); |
| 96 | return 0; |
| 97 | } |
| 98 | |
| 99 | #endif /* __ARCH_WANT_SYS_TIME */ |
| 100 | |
| 101 | asmlinkage long sys_gettimeofday(struct timeval __user *tv, struct timezone __user *tz) |
| 102 | { |
| 103 | if (likely(tv != NULL)) { |
| 104 | struct timeval ktv; |
| 105 | do_gettimeofday(&ktv); |
| 106 | if (copy_to_user(tv, &ktv, sizeof(ktv))) |
| 107 | return -EFAULT; |
| 108 | } |
| 109 | if (unlikely(tz != NULL)) { |
| 110 | if (copy_to_user(tz, &sys_tz, sizeof(sys_tz))) |
| 111 | return -EFAULT; |
| 112 | } |
| 113 | return 0; |
| 114 | } |
| 115 | |
| 116 | /* |
| 117 | * Adjust the time obtained from the CMOS to be UTC time instead of |
| 118 | * local time. |
| 119 | * |
| 120 | * This is ugly, but preferable to the alternatives. Otherwise we |
| 121 | * would either need to write a program to do it in /etc/rc (and risk |
| 122 | * confusion if the program gets run more than once; it would also be |
| 123 | * hard to make the program warp the clock precisely n hours) or |
| 124 | * compile in the timezone information into the kernel. Bad, bad.... |
| 125 | * |
| 126 | * - TYT, 1992-01-01 |
| 127 | * |
| 128 | * The best thing to do is to keep the CMOS clock in universal time (UTC) |
| 129 | * as real UNIX machines always do it. This avoids all headaches about |
| 130 | * daylight saving times and warping kernel clocks. |
| 131 | */ |
Jesper Juhl | 77933d7 | 2005-07-27 11:46:09 -0700 | [diff] [blame] | 132 | static inline void warp_clock(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | { |
| 134 | write_seqlock_irq(&xtime_lock); |
| 135 | wall_to_monotonic.tv_sec -= sys_tz.tz_minuteswest * 60; |
| 136 | xtime.tv_sec += sys_tz.tz_minuteswest * 60; |
| 137 | time_interpolator_reset(); |
| 138 | write_sequnlock_irq(&xtime_lock); |
| 139 | clock_was_set(); |
| 140 | } |
| 141 | |
| 142 | /* |
| 143 | * In case for some reason the CMOS clock has not already been running |
| 144 | * in UTC, but in some local time: The first time we set the timezone, |
| 145 | * we will warp the clock so that it is ticking UTC time instead of |
| 146 | * local time. Presumably, if someone is setting the timezone then we |
| 147 | * are running in an environment where the programs understand about |
| 148 | * timezones. This should be done at boot time in the /etc/rc script, |
| 149 | * as soon as possible, so that the clock can be set right. Otherwise, |
| 150 | * various programs will get confused when the clock gets warped. |
| 151 | */ |
| 152 | |
| 153 | int do_sys_settimeofday(struct timespec *tv, struct timezone *tz) |
| 154 | { |
| 155 | static int firsttime = 1; |
| 156 | int error = 0; |
| 157 | |
Linus Torvalds | 951069e | 2006-01-31 10:16:55 -0800 | [diff] [blame] | 158 | if (tv && !timespec_valid(tv)) |
Thomas Gleixner | 718bcce | 2006-01-09 20:52:29 -0800 | [diff] [blame] | 159 | return -EINVAL; |
| 160 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | error = security_settime(tv, tz); |
| 162 | if (error) |
| 163 | return error; |
| 164 | |
| 165 | if (tz) { |
| 166 | /* SMP safe, global irq locking makes it work. */ |
| 167 | sys_tz = *tz; |
| 168 | if (firsttime) { |
| 169 | firsttime = 0; |
| 170 | if (!tv) |
| 171 | warp_clock(); |
| 172 | } |
| 173 | } |
| 174 | if (tv) |
| 175 | { |
| 176 | /* SMP safe, again the code in arch/foo/time.c should |
| 177 | * globally block out interrupts when it runs. |
| 178 | */ |
| 179 | return do_settimeofday(tv); |
| 180 | } |
| 181 | return 0; |
| 182 | } |
| 183 | |
| 184 | asmlinkage long sys_settimeofday(struct timeval __user *tv, |
| 185 | struct timezone __user *tz) |
| 186 | { |
| 187 | struct timeval user_tv; |
| 188 | struct timespec new_ts; |
| 189 | struct timezone new_tz; |
| 190 | |
| 191 | if (tv) { |
| 192 | if (copy_from_user(&user_tv, tv, sizeof(*tv))) |
| 193 | return -EFAULT; |
| 194 | new_ts.tv_sec = user_tv.tv_sec; |
| 195 | new_ts.tv_nsec = user_tv.tv_usec * NSEC_PER_USEC; |
| 196 | } |
| 197 | if (tz) { |
| 198 | if (copy_from_user(&new_tz, tz, sizeof(*tz))) |
| 199 | return -EFAULT; |
| 200 | } |
| 201 | |
| 202 | return do_sys_settimeofday(tv ? &new_ts : NULL, tz ? &new_tz : NULL); |
| 203 | } |
| 204 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | asmlinkage long sys_adjtimex(struct timex __user *txc_p) |
| 206 | { |
| 207 | struct timex txc; /* Local copy of parameter */ |
| 208 | int ret; |
| 209 | |
| 210 | /* Copy the user data space into the kernel copy |
| 211 | * structure. But bear in mind that the structures |
| 212 | * may change |
| 213 | */ |
| 214 | if(copy_from_user(&txc, txc_p, sizeof(struct timex))) |
| 215 | return -EFAULT; |
| 216 | ret = do_adjtimex(&txc); |
| 217 | return copy_to_user(txc_p, &txc, sizeof(struct timex)) ? -EFAULT : ret; |
| 218 | } |
| 219 | |
| 220 | inline struct timespec current_kernel_time(void) |
| 221 | { |
| 222 | struct timespec now; |
| 223 | unsigned long seq; |
| 224 | |
| 225 | do { |
| 226 | seq = read_seqbegin(&xtime_lock); |
| 227 | |
| 228 | now = xtime; |
| 229 | } while (read_seqretry(&xtime_lock, seq)); |
| 230 | |
| 231 | return now; |
| 232 | } |
| 233 | |
| 234 | EXPORT_SYMBOL(current_kernel_time); |
| 235 | |
| 236 | /** |
| 237 | * current_fs_time - Return FS time |
| 238 | * @sb: Superblock. |
| 239 | * |
Kalin KOZHUHAROV | 8ba8e95 | 2006-04-01 01:41:22 +0200 | [diff] [blame] | 240 | * Return the current time truncated to the time granularity supported by |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | * the fs. |
| 242 | */ |
| 243 | struct timespec current_fs_time(struct super_block *sb) |
| 244 | { |
| 245 | struct timespec now = current_kernel_time(); |
| 246 | return timespec_trunc(now, sb->s_time_gran); |
| 247 | } |
| 248 | EXPORT_SYMBOL(current_fs_time); |
| 249 | |
| 250 | /** |
Kalin KOZHUHAROV | 8ba8e95 | 2006-04-01 01:41:22 +0200 | [diff] [blame] | 251 | * timespec_trunc - Truncate timespec to a granularity |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | * @t: Timespec |
Kalin KOZHUHAROV | 8ba8e95 | 2006-04-01 01:41:22 +0200 | [diff] [blame] | 253 | * @gran: Granularity in ns. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | * |
Kalin KOZHUHAROV | 8ba8e95 | 2006-04-01 01:41:22 +0200 | [diff] [blame] | 255 | * Truncate a timespec to a granularity. gran must be smaller than a second. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | * Always rounds down. |
| 257 | * |
| 258 | * This function should be only used for timestamps returned by |
| 259 | * current_kernel_time() or CURRENT_TIME, not with do_gettimeofday() because |
| 260 | * it doesn't handle the better resolution of the later. |
| 261 | */ |
| 262 | struct timespec timespec_trunc(struct timespec t, unsigned gran) |
| 263 | { |
| 264 | /* |
| 265 | * Division is pretty slow so avoid it for common cases. |
| 266 | * Currently current_kernel_time() never returns better than |
| 267 | * jiffies resolution. Exploit that. |
| 268 | */ |
| 269 | if (gran <= jiffies_to_usecs(1) * 1000) { |
| 270 | /* nothing */ |
| 271 | } else if (gran == 1000000000) { |
| 272 | t.tv_nsec = 0; |
| 273 | } else { |
| 274 | t.tv_nsec -= t.tv_nsec % gran; |
| 275 | } |
| 276 | return t; |
| 277 | } |
| 278 | EXPORT_SYMBOL(timespec_trunc); |
| 279 | |
| 280 | #ifdef CONFIG_TIME_INTERPOLATION |
| 281 | void getnstimeofday (struct timespec *tv) |
| 282 | { |
| 283 | unsigned long seq,sec,nsec; |
| 284 | |
| 285 | do { |
| 286 | seq = read_seqbegin(&xtime_lock); |
| 287 | sec = xtime.tv_sec; |
| 288 | nsec = xtime.tv_nsec+time_interpolator_get_offset(); |
| 289 | } while (unlikely(read_seqretry(&xtime_lock, seq))); |
| 290 | |
| 291 | while (unlikely(nsec >= NSEC_PER_SEC)) { |
| 292 | nsec -= NSEC_PER_SEC; |
| 293 | ++sec; |
| 294 | } |
| 295 | tv->tv_sec = sec; |
| 296 | tv->tv_nsec = nsec; |
| 297 | } |
| 298 | EXPORT_SYMBOL_GPL(getnstimeofday); |
| 299 | |
| 300 | int do_settimeofday (struct timespec *tv) |
| 301 | { |
| 302 | time_t wtm_sec, sec = tv->tv_sec; |
| 303 | long wtm_nsec, nsec = tv->tv_nsec; |
| 304 | |
| 305 | if ((unsigned long)tv->tv_nsec >= NSEC_PER_SEC) |
| 306 | return -EINVAL; |
| 307 | |
| 308 | write_seqlock_irq(&xtime_lock); |
| 309 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | wtm_sec = wall_to_monotonic.tv_sec + (xtime.tv_sec - sec); |
| 311 | wtm_nsec = wall_to_monotonic.tv_nsec + (xtime.tv_nsec - nsec); |
| 312 | |
| 313 | set_normalized_timespec(&xtime, sec, nsec); |
| 314 | set_normalized_timespec(&wall_to_monotonic, wtm_sec, wtm_nsec); |
| 315 | |
| 316 | time_adjust = 0; /* stop active adjtime() */ |
| 317 | time_status |= STA_UNSYNC; |
| 318 | time_maxerror = NTP_PHASE_LIMIT; |
| 319 | time_esterror = NTP_PHASE_LIMIT; |
| 320 | time_interpolator_reset(); |
| 321 | } |
| 322 | write_sequnlock_irq(&xtime_lock); |
| 323 | clock_was_set(); |
| 324 | return 0; |
| 325 | } |
Al Viro | 943eae0 | 2005-10-29 07:32:07 +0100 | [diff] [blame] | 326 | EXPORT_SYMBOL(do_settimeofday); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | |
| 328 | void do_gettimeofday (struct timeval *tv) |
| 329 | { |
| 330 | unsigned long seq, nsec, usec, sec, offset; |
| 331 | do { |
| 332 | seq = read_seqbegin(&xtime_lock); |
| 333 | offset = time_interpolator_get_offset(); |
| 334 | sec = xtime.tv_sec; |
| 335 | nsec = xtime.tv_nsec; |
| 336 | } while (unlikely(read_seqretry(&xtime_lock, seq))); |
| 337 | |
| 338 | usec = (nsec + offset) / 1000; |
| 339 | |
| 340 | while (unlikely(usec >= USEC_PER_SEC)) { |
| 341 | usec -= USEC_PER_SEC; |
| 342 | ++sec; |
| 343 | } |
| 344 | |
| 345 | tv->tv_sec = sec; |
| 346 | tv->tv_usec = usec; |
| 347 | } |
| 348 | |
| 349 | EXPORT_SYMBOL(do_gettimeofday); |
| 350 | |
| 351 | |
| 352 | #else |
john stultz | cf3c769 | 2006-06-26 00:25:08 -0700 | [diff] [blame] | 353 | #ifndef CONFIG_GENERIC_TIME |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | /* |
| 355 | * Simulate gettimeofday using do_gettimeofday which only allows a timeval |
| 356 | * and therefore only yields usec accuracy |
| 357 | */ |
| 358 | void getnstimeofday(struct timespec *tv) |
| 359 | { |
| 360 | struct timeval x; |
| 361 | |
| 362 | do_gettimeofday(&x); |
| 363 | tv->tv_sec = x.tv_sec; |
| 364 | tv->tv_nsec = x.tv_usec * NSEC_PER_USEC; |
| 365 | } |
Takashi Iwai | c6ecf7e | 2005-10-14 15:59:03 -0700 | [diff] [blame] | 366 | EXPORT_SYMBOL_GPL(getnstimeofday); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | #endif |
john stultz | cf3c769 | 2006-06-26 00:25:08 -0700 | [diff] [blame] | 368 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | |
Thomas Gleixner | 753be62 | 2006-01-09 20:52:22 -0800 | [diff] [blame] | 370 | /* Converts Gregorian date to seconds since 1970-01-01 00:00:00. |
| 371 | * Assumes input in normal date format, i.e. 1980-12-31 23:59:59 |
| 372 | * => year=1980, mon=12, day=31, hour=23, min=59, sec=59. |
| 373 | * |
| 374 | * [For the Julian calendar (which was used in Russia before 1917, |
| 375 | * Britain & colonies before 1752, anywhere else before 1582, |
| 376 | * and is still in use by some communities) leave out the |
| 377 | * -year/100+year/400 terms, and add 10.] |
| 378 | * |
| 379 | * This algorithm was first published by Gauss (I think). |
| 380 | * |
| 381 | * WARNING: this function will overflow on 2106-02-07 06:28:16 on |
| 382 | * machines were long is 32-bit! (However, as time_t is signed, we |
| 383 | * will already get problems at other places on 2038-01-19 03:14:08) |
| 384 | */ |
| 385 | unsigned long |
Ingo Molnar | f481890 | 2006-01-09 20:52:23 -0800 | [diff] [blame] | 386 | mktime(const unsigned int year0, const unsigned int mon0, |
| 387 | const unsigned int day, const unsigned int hour, |
| 388 | const unsigned int min, const unsigned int sec) |
Thomas Gleixner | 753be62 | 2006-01-09 20:52:22 -0800 | [diff] [blame] | 389 | { |
Ingo Molnar | f481890 | 2006-01-09 20:52:23 -0800 | [diff] [blame] | 390 | unsigned int mon = mon0, year = year0; |
| 391 | |
| 392 | /* 1..12 -> 11,12,1..10 */ |
| 393 | if (0 >= (int) (mon -= 2)) { |
| 394 | mon += 12; /* Puts Feb last since it has leap day */ |
Thomas Gleixner | 753be62 | 2006-01-09 20:52:22 -0800 | [diff] [blame] | 395 | year -= 1; |
| 396 | } |
| 397 | |
| 398 | return ((((unsigned long) |
| 399 | (year/4 - year/100 + year/400 + 367*mon/12 + day) + |
| 400 | year*365 - 719499 |
| 401 | )*24 + hour /* now have hours */ |
| 402 | )*60 + min /* now have minutes */ |
| 403 | )*60 + sec; /* finally seconds */ |
| 404 | } |
| 405 | |
Andrew Morton | 199e705 | 2006-01-09 20:52:24 -0800 | [diff] [blame] | 406 | EXPORT_SYMBOL(mktime); |
| 407 | |
Thomas Gleixner | 753be62 | 2006-01-09 20:52:22 -0800 | [diff] [blame] | 408 | /** |
| 409 | * set_normalized_timespec - set timespec sec and nsec parts and normalize |
| 410 | * |
| 411 | * @ts: pointer to timespec variable to be set |
| 412 | * @sec: seconds to set |
| 413 | * @nsec: nanoseconds to set |
| 414 | * |
| 415 | * Set seconds and nanoseconds field of a timespec variable and |
| 416 | * normalize to the timespec storage format |
| 417 | * |
| 418 | * Note: The tv_nsec part is always in the range of |
| 419 | * 0 <= tv_nsec < NSEC_PER_SEC |
| 420 | * For negative values only the tv_sec field is negative ! |
| 421 | */ |
Ingo Molnar | f481890 | 2006-01-09 20:52:23 -0800 | [diff] [blame] | 422 | void set_normalized_timespec(struct timespec *ts, time_t sec, long nsec) |
Thomas Gleixner | 753be62 | 2006-01-09 20:52:22 -0800 | [diff] [blame] | 423 | { |
| 424 | while (nsec >= NSEC_PER_SEC) { |
| 425 | nsec -= NSEC_PER_SEC; |
| 426 | ++sec; |
| 427 | } |
| 428 | while (nsec < 0) { |
| 429 | nsec += NSEC_PER_SEC; |
| 430 | --sec; |
| 431 | } |
| 432 | ts->tv_sec = sec; |
| 433 | ts->tv_nsec = nsec; |
| 434 | } |
| 435 | |
Thomas Gleixner | f8f46da | 2006-01-09 20:52:30 -0800 | [diff] [blame] | 436 | /** |
| 437 | * ns_to_timespec - Convert nanoseconds to timespec |
| 438 | * @nsec: the nanoseconds value to be converted |
| 439 | * |
| 440 | * Returns the timespec representation of the nsec parameter. |
| 441 | */ |
Roman Zippel | df869b6 | 2006-03-26 01:38:11 -0800 | [diff] [blame] | 442 | struct timespec ns_to_timespec(const s64 nsec) |
Thomas Gleixner | f8f46da | 2006-01-09 20:52:30 -0800 | [diff] [blame] | 443 | { |
| 444 | struct timespec ts; |
| 445 | |
George Anzinger | 88fc389 | 2006-02-03 03:04:20 -0800 | [diff] [blame] | 446 | if (!nsec) |
| 447 | return (struct timespec) {0, 0}; |
| 448 | |
| 449 | ts.tv_sec = div_long_long_rem_signed(nsec, NSEC_PER_SEC, &ts.tv_nsec); |
| 450 | if (unlikely(nsec < 0)) |
| 451 | set_normalized_timespec(&ts, ts.tv_sec, ts.tv_nsec); |
Thomas Gleixner | f8f46da | 2006-01-09 20:52:30 -0800 | [diff] [blame] | 452 | |
| 453 | return ts; |
| 454 | } |
| 455 | |
| 456 | /** |
| 457 | * ns_to_timeval - Convert nanoseconds to timeval |
| 458 | * @nsec: the nanoseconds value to be converted |
| 459 | * |
| 460 | * Returns the timeval representation of the nsec parameter. |
| 461 | */ |
Roman Zippel | df869b6 | 2006-03-26 01:38:11 -0800 | [diff] [blame] | 462 | struct timeval ns_to_timeval(const s64 nsec) |
Thomas Gleixner | f8f46da | 2006-01-09 20:52:30 -0800 | [diff] [blame] | 463 | { |
| 464 | struct timespec ts = ns_to_timespec(nsec); |
| 465 | struct timeval tv; |
| 466 | |
| 467 | tv.tv_sec = ts.tv_sec; |
| 468 | tv.tv_usec = (suseconds_t) ts.tv_nsec / 1000; |
| 469 | |
| 470 | return tv; |
| 471 | } |
| 472 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | #if (BITS_PER_LONG < 64) |
| 474 | u64 get_jiffies_64(void) |
| 475 | { |
| 476 | unsigned long seq; |
| 477 | u64 ret; |
| 478 | |
| 479 | do { |
| 480 | seq = read_seqbegin(&xtime_lock); |
| 481 | ret = jiffies_64; |
| 482 | } while (read_seqretry(&xtime_lock, seq)); |
| 483 | return ret; |
| 484 | } |
| 485 | |
| 486 | EXPORT_SYMBOL(get_jiffies_64); |
| 487 | #endif |
| 488 | |
| 489 | EXPORT_SYMBOL(jiffies); |