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1da177e4 LT |
1 | #ifndef _LINUX_JIFFIES_H |
2 | #define _LINUX_JIFFIES_H | |
3 | ||
7c30f352 | 4 | #include <linux/cache.h> |
f8bd2258 | 5 | #include <linux/math64.h> |
1da177e4 LT |
6 | #include <linux/kernel.h> |
7 | #include <linux/types.h> | |
8 | #include <linux/time.h> | |
9 | #include <linux/timex.h> | |
10 | #include <asm/param.h> /* for HZ */ | |
ca42aaf0 | 11 | #include <generated/timeconst.h> |
1da177e4 LT |
12 | |
13 | /* | |
14 | * The following defines establish the engineering parameters of the PLL | |
15 | * model. The HZ variable establishes the timer interrupt frequency, 100 Hz | |
16 | * for the SunOS kernel, 256 Hz for the Ultrix kernel and 1024 Hz for the | |
17 | * OSF/1 kernel. The SHIFT_HZ define expresses the same value as the | |
18 | * nearest power of two in order to avoid hardware multiply operations. | |
19 | */ | |
20 | #if HZ >= 12 && HZ < 24 | |
21 | # define SHIFT_HZ 4 | |
22 | #elif HZ >= 24 && HZ < 48 | |
23 | # define SHIFT_HZ 5 | |
24 | #elif HZ >= 48 && HZ < 96 | |
25 | # define SHIFT_HZ 6 | |
26 | #elif HZ >= 96 && HZ < 192 | |
27 | # define SHIFT_HZ 7 | |
28 | #elif HZ >= 192 && HZ < 384 | |
29 | # define SHIFT_HZ 8 | |
30 | #elif HZ >= 384 && HZ < 768 | |
31 | # define SHIFT_HZ 9 | |
32 | #elif HZ >= 768 && HZ < 1536 | |
33 | # define SHIFT_HZ 10 | |
e118adef PM |
34 | #elif HZ >= 1536 && HZ < 3072 |
35 | # define SHIFT_HZ 11 | |
36 | #elif HZ >= 3072 && HZ < 6144 | |
37 | # define SHIFT_HZ 12 | |
38 | #elif HZ >= 6144 && HZ < 12288 | |
39 | # define SHIFT_HZ 13 | |
1da177e4 | 40 | #else |
37679011 | 41 | # error Invalid value of HZ. |
1da177e4 LT |
42 | #endif |
43 | ||
25985edc | 44 | /* Suppose we want to divide two numbers NOM and DEN: NOM/DEN, then we can |
1da177e4 LT |
45 | * improve accuracy by shifting LSH bits, hence calculating: |
46 | * (NOM << LSH) / DEN | |
47 | * This however means trouble for large NOM, because (NOM << LSH) may no | |
48 | * longer fit in 32 bits. The following way of calculating this gives us | |
49 | * some slack, under the following conditions: | |
50 | * - (NOM / DEN) fits in (32 - LSH) bits. | |
51 | * - (NOM % DEN) fits in (32 - LSH) bits. | |
52 | */ | |
0d94df56 UZ |
53 | #define SH_DIV(NOM,DEN,LSH) ( (((NOM) / (DEN)) << (LSH)) \ |
54 | + ((((NOM) % (DEN)) << (LSH)) + (DEN) / 2) / (DEN)) | |
1da177e4 | 55 | |
a7ea3bbf | 56 | /* LATCH is used in the interval timer and ftape setup. */ |
015a830d | 57 | #define LATCH ((CLOCK_TICK_RATE + HZ/2) / HZ) /* For divider */ |
a7ea3bbf | 58 | |
b3c869d3 | 59 | extern int register_refined_jiffies(long clock_tick_rate); |
1da177e4 | 60 | |
02ab20ae | 61 | /* TICK_NSEC is the time between ticks in nsec assuming SHIFTED_HZ */ |
b3c869d3 | 62 | #define TICK_NSEC ((NSEC_PER_SEC+HZ/2)/HZ) |
1da177e4 LT |
63 | |
64 | /* TICK_USEC is the time between ticks in usec assuming fake USER_HZ */ | |
65 | #define TICK_USEC ((1000000UL + USER_HZ/2) / USER_HZ) | |
66 | ||
1da177e4 | 67 | /* |
98c4f0c3 | 68 | * The 64-bit value is not atomic - you MUST NOT read it |
d6ad4187 | 69 | * without sampling the sequence number in jiffies_lock. |
1da177e4 LT |
70 | * get_jiffies_64() will do this for you as appropriate. |
71 | */ | |
7c30f352 MK |
72 | extern u64 __cacheline_aligned_in_smp jiffies_64; |
73 | extern unsigned long volatile __cacheline_aligned_in_smp jiffies; | |
1da177e4 LT |
74 | |
75 | #if (BITS_PER_LONG < 64) | |
76 | u64 get_jiffies_64(void); | |
77 | #else | |
78 | static inline u64 get_jiffies_64(void) | |
79 | { | |
80 | return (u64)jiffies; | |
81 | } | |
82 | #endif | |
83 | ||
84 | /* | |
85 | * These inlines deal with timer wrapping correctly. You are | |
86 | * strongly encouraged to use them | |
87 | * 1. Because people otherwise forget | |
88 | * 2. Because if the timer wrap changes in future you won't have to | |
89 | * alter your driver code. | |
90 | * | |
91 | * time_after(a,b) returns true if the time a is after time b. | |
92 | * | |
93 | * Do this with "<0" and ">=0" to only test the sign of the result. A | |
94 | * good compiler would generate better code (and a really good compiler | |
95 | * wouldn't care). Gcc is currently neither. | |
96 | */ | |
97 | #define time_after(a,b) \ | |
98 | (typecheck(unsigned long, a) && \ | |
99 | typecheck(unsigned long, b) && \ | |
5a581b36 | 100 | ((long)((b) - (a)) < 0)) |
1da177e4 LT |
101 | #define time_before(a,b) time_after(b,a) |
102 | ||
103 | #define time_after_eq(a,b) \ | |
104 | (typecheck(unsigned long, a) && \ | |
105 | typecheck(unsigned long, b) && \ | |
5a581b36 | 106 | ((long)((a) - (b)) >= 0)) |
1da177e4 LT |
107 | #define time_before_eq(a,b) time_after_eq(b,a) |
108 | ||
64672d55 PS |
109 | /* |
110 | * Calculate whether a is in the range of [b, c]. | |
111 | */ | |
c7e15961 FOL |
112 | #define time_in_range(a,b,c) \ |
113 | (time_after_eq(a,b) && \ | |
114 | time_before_eq(a,c)) | |
115 | ||
64672d55 PS |
116 | /* |
117 | * Calculate whether a is in the range of [b, c). | |
118 | */ | |
119 | #define time_in_range_open(a,b,c) \ | |
120 | (time_after_eq(a,b) && \ | |
121 | time_before(a,c)) | |
122 | ||
3b171672 DZ |
123 | /* Same as above, but does so with platform independent 64bit types. |
124 | * These must be used when utilizing jiffies_64 (i.e. return value of | |
125 | * get_jiffies_64() */ | |
126 | #define time_after64(a,b) \ | |
127 | (typecheck(__u64, a) && \ | |
128 | typecheck(__u64, b) && \ | |
5a581b36 | 129 | ((__s64)((b) - (a)) < 0)) |
3b171672 DZ |
130 | #define time_before64(a,b) time_after64(b,a) |
131 | ||
132 | #define time_after_eq64(a,b) \ | |
133 | (typecheck(__u64, a) && \ | |
134 | typecheck(__u64, b) && \ | |
5a581b36 | 135 | ((__s64)((a) - (b)) >= 0)) |
3b171672 DZ |
136 | #define time_before_eq64(a,b) time_after_eq64(b,a) |
137 | ||
1bc2774d ET |
138 | #define time_in_range64(a, b, c) \ |
139 | (time_after_eq64(a, b) && \ | |
140 | time_before_eq64(a, c)) | |
141 | ||
3f34d024 DY |
142 | /* |
143 | * These four macros compare jiffies and 'a' for convenience. | |
144 | */ | |
145 | ||
146 | /* time_is_before_jiffies(a) return true if a is before jiffies */ | |
147 | #define time_is_before_jiffies(a) time_after(jiffies, a) | |
3740dcdf | 148 | #define time_is_before_jiffies64(a) time_after64(get_jiffies_64(), a) |
3f34d024 DY |
149 | |
150 | /* time_is_after_jiffies(a) return true if a is after jiffies */ | |
151 | #define time_is_after_jiffies(a) time_before(jiffies, a) | |
3740dcdf | 152 | #define time_is_after_jiffies64(a) time_before64(get_jiffies_64(), a) |
3f34d024 DY |
153 | |
154 | /* time_is_before_eq_jiffies(a) return true if a is before or equal to jiffies*/ | |
155 | #define time_is_before_eq_jiffies(a) time_after_eq(jiffies, a) | |
3740dcdf | 156 | #define time_is_before_eq_jiffies64(a) time_after_eq64(get_jiffies_64(), a) |
3f34d024 DY |
157 | |
158 | /* time_is_after_eq_jiffies(a) return true if a is after or equal to jiffies*/ | |
159 | #define time_is_after_eq_jiffies(a) time_before_eq(jiffies, a) | |
3740dcdf | 160 | #define time_is_after_eq_jiffies64(a) time_before_eq64(get_jiffies_64(), a) |
3f34d024 | 161 | |
1da177e4 LT |
162 | /* |
163 | * Have the 32 bit jiffies value wrap 5 minutes after boot | |
164 | * so jiffies wrap bugs show up earlier. | |
165 | */ | |
166 | #define INITIAL_JIFFIES ((unsigned long)(unsigned int) (-300*HZ)) | |
167 | ||
168 | /* | |
169 | * Change timeval to jiffies, trying to avoid the | |
170 | * most obvious overflows.. | |
171 | * | |
172 | * And some not so obvious. | |
173 | * | |
9f907c01 | 174 | * Note that we don't want to return LONG_MAX, because |
1da177e4 LT |
175 | * for various timeout reasons we often end up having |
176 | * to wait "jiffies+1" in order to guarantee that we wait | |
177 | * at _least_ "jiffies" - so "jiffies+1" had better still | |
178 | * be positive. | |
179 | */ | |
9f907c01 | 180 | #define MAX_JIFFY_OFFSET ((LONG_MAX >> 1)-1) |
1da177e4 | 181 | |
bfe8df3d RD |
182 | extern unsigned long preset_lpj; |
183 | ||
1da177e4 LT |
184 | /* |
185 | * We want to do realistic conversions of time so we need to use the same | |
186 | * values the update wall clock code uses as the jiffies size. This value | |
187 | * is: TICK_NSEC (which is defined in timex.h). This | |
3eb05676 | 188 | * is a constant and is in nanoseconds. We will use scaled math |
1da177e4 LT |
189 | * with a set of scales defined here as SEC_JIFFIE_SC, USEC_JIFFIE_SC and |
190 | * NSEC_JIFFIE_SC. Note that these defines contain nothing but | |
191 | * constants and so are computed at compile time. SHIFT_HZ (computed in | |
192 | * timex.h) adjusts the scaling for different HZ values. | |
193 | ||
194 | * Scaled math??? What is that? | |
195 | * | |
196 | * Scaled math is a way to do integer math on values that would, | |
197 | * otherwise, either overflow, underflow, or cause undesired div | |
198 | * instructions to appear in the execution path. In short, we "scale" | |
199 | * up the operands so they take more bits (more precision, less | |
200 | * underflow), do the desired operation and then "scale" the result back | |
201 | * by the same amount. If we do the scaling by shifting we avoid the | |
202 | * costly mpy and the dastardly div instructions. | |
203 | ||
204 | * Suppose, for example, we want to convert from seconds to jiffies | |
205 | * where jiffies is defined in nanoseconds as NSEC_PER_JIFFIE. The | |
206 | * simple math is: jiff = (sec * NSEC_PER_SEC) / NSEC_PER_JIFFIE; We | |
207 | * observe that (NSEC_PER_SEC / NSEC_PER_JIFFIE) is a constant which we | |
208 | * might calculate at compile time, however, the result will only have | |
209 | * about 3-4 bits of precision (less for smaller values of HZ). | |
210 | * | |
211 | * So, we scale as follows: | |
212 | * jiff = (sec) * (NSEC_PER_SEC / NSEC_PER_JIFFIE); | |
213 | * jiff = ((sec) * ((NSEC_PER_SEC * SCALE)/ NSEC_PER_JIFFIE)) / SCALE; | |
214 | * Then we make SCALE a power of two so: | |
215 | * jiff = ((sec) * ((NSEC_PER_SEC << SCALE)/ NSEC_PER_JIFFIE)) >> SCALE; | |
216 | * Now we define: | |
217 | * #define SEC_CONV = ((NSEC_PER_SEC << SCALE)/ NSEC_PER_JIFFIE)) | |
218 | * jiff = (sec * SEC_CONV) >> SCALE; | |
219 | * | |
220 | * Often the math we use will expand beyond 32-bits so we tell C how to | |
221 | * do this and pass the 64-bit result of the mpy through the ">> SCALE" | |
222 | * which should take the result back to 32-bits. We want this expansion | |
223 | * to capture as much precision as possible. At the same time we don't | |
224 | * want to overflow so we pick the SCALE to avoid this. In this file, | |
225 | * that means using a different scale for each range of HZ values (as | |
226 | * defined in timex.h). | |
227 | * | |
228 | * For those who want to know, gcc will give a 64-bit result from a "*" | |
229 | * operator if the result is a long long AND at least one of the | |
230 | * operands is cast to long long (usually just prior to the "*" so as | |
231 | * not to confuse it into thinking it really has a 64-bit operand, | |
3eb05676 | 232 | * which, buy the way, it can do, but it takes more code and at least 2 |
1da177e4 LT |
233 | * mpys). |
234 | ||
235 | * We also need to be aware that one second in nanoseconds is only a | |
236 | * couple of bits away from overflowing a 32-bit word, so we MUST use | |
237 | * 64-bits to get the full range time in nanoseconds. | |
238 | ||
239 | */ | |
240 | ||
241 | /* | |
242 | * Here are the scales we will use. One for seconds, nanoseconds and | |
243 | * microseconds. | |
244 | * | |
245 | * Within the limits of cpp we do a rough cut at the SEC_JIFFIE_SC and | |
246 | * check if the sign bit is set. If not, we bump the shift count by 1. | |
247 | * (Gets an extra bit of precision where we can use it.) | |
248 | * We know it is set for HZ = 1024 and HZ = 100 not for 1000. | |
249 | * Haven't tested others. | |
250 | ||
251 | * Limits of cpp (for #if expressions) only long (no long long), but | |
252 | * then we only need the most signicant bit. | |
253 | */ | |
254 | ||
255 | #define SEC_JIFFIE_SC (31 - SHIFT_HZ) | |
256 | #if !((((NSEC_PER_SEC << 2) / TICK_NSEC) << (SEC_JIFFIE_SC - 2)) & 0x80000000) | |
257 | #undef SEC_JIFFIE_SC | |
258 | #define SEC_JIFFIE_SC (32 - SHIFT_HZ) | |
259 | #endif | |
260 | #define NSEC_JIFFIE_SC (SEC_JIFFIE_SC + 29) | |
1da177e4 LT |
261 | #define SEC_CONVERSION ((unsigned long)((((u64)NSEC_PER_SEC << SEC_JIFFIE_SC) +\ |
262 | TICK_NSEC -1) / (u64)TICK_NSEC)) | |
263 | ||
264 | #define NSEC_CONVERSION ((unsigned long)((((u64)1 << NSEC_JIFFIE_SC) +\ | |
265 | TICK_NSEC -1) / (u64)TICK_NSEC)) | |
1da177e4 LT |
266 | /* |
267 | * The maximum jiffie value is (MAX_INT >> 1). Here we translate that | |
268 | * into seconds. The 64-bit case will overflow if we are not careful, | |
269 | * so use the messy SH_DIV macro to do it. Still all constants. | |
270 | */ | |
271 | #if BITS_PER_LONG < 64 | |
272 | # define MAX_SEC_IN_JIFFIES \ | |
273 | (long)((u64)((u64)MAX_JIFFY_OFFSET * TICK_NSEC) / NSEC_PER_SEC) | |
274 | #else /* take care of overflow on 64 bits machines */ | |
275 | # define MAX_SEC_IN_JIFFIES \ | |
276 | (SH_DIV((MAX_JIFFY_OFFSET >> SEC_JIFFIE_SC) * TICK_NSEC, NSEC_PER_SEC, 1) - 1) | |
277 | ||
278 | #endif | |
279 | ||
280 | /* | |
8b9365d7 | 281 | * Convert various time units to each other: |
1da177e4 | 282 | */ |
8b9365d7 IM |
283 | extern unsigned int jiffies_to_msecs(const unsigned long j); |
284 | extern unsigned int jiffies_to_usecs(const unsigned long j); | |
8fe8ff09 KH |
285 | |
286 | static inline u64 jiffies_to_nsecs(const unsigned long j) | |
287 | { | |
288 | return (u64)jiffies_to_usecs(j) * NSEC_PER_USEC; | |
289 | } | |
290 | ||
07e5f5e3 FW |
291 | extern u64 jiffies64_to_nsecs(u64 j); |
292 | ||
ca42aaf0 NMG |
293 | extern unsigned long __msecs_to_jiffies(const unsigned int m); |
294 | #if HZ <= MSEC_PER_SEC && !(MSEC_PER_SEC % HZ) | |
295 | /* | |
296 | * HZ is equal to or smaller than 1000, and 1000 is a nice round | |
297 | * multiple of HZ, divide with the factor between them, but round | |
298 | * upwards: | |
299 | */ | |
300 | static inline unsigned long _msecs_to_jiffies(const unsigned int m) | |
301 | { | |
4e3d9cb0 | 302 | return (m + (MSEC_PER_SEC / HZ) - 1) / (MSEC_PER_SEC / HZ); |
ca42aaf0 NMG |
303 | } |
304 | #elif HZ > MSEC_PER_SEC && !(HZ % MSEC_PER_SEC) | |
305 | /* | |
306 | * HZ is larger than 1000, and HZ is a nice round multiple of 1000 - | |
307 | * simply multiply with the factor between them. | |
308 | * | |
309 | * But first make sure the multiplication result cannot overflow: | |
310 | */ | |
311 | static inline unsigned long _msecs_to_jiffies(const unsigned int m) | |
312 | { | |
4e3d9cb0 TG |
313 | if (m > jiffies_to_msecs(MAX_JIFFY_OFFSET)) |
314 | return MAX_JIFFY_OFFSET; | |
315 | return m * (HZ / MSEC_PER_SEC); | |
ca42aaf0 NMG |
316 | } |
317 | #else | |
318 | /* | |
319 | * Generic case - multiply, round and divide. But first check that if | |
320 | * we are doing a net multiplication, that we wouldn't overflow: | |
321 | */ | |
322 | static inline unsigned long _msecs_to_jiffies(const unsigned int m) | |
323 | { | |
4e3d9cb0 TG |
324 | if (HZ > MSEC_PER_SEC && m > jiffies_to_msecs(MAX_JIFFY_OFFSET)) |
325 | return MAX_JIFFY_OFFSET; | |
ca42aaf0 | 326 | |
4e3d9cb0 | 327 | return (MSEC_TO_HZ_MUL32 * m + MSEC_TO_HZ_ADJ32) >> MSEC_TO_HZ_SHR32; |
ca42aaf0 NMG |
328 | } |
329 | #endif | |
330 | /** | |
331 | * msecs_to_jiffies: - convert milliseconds to jiffies | |
332 | * @m: time in milliseconds | |
333 | * | |
334 | * conversion is done as follows: | |
335 | * | |
336 | * - negative values mean 'infinite timeout' (MAX_JIFFY_OFFSET) | |
337 | * | |
338 | * - 'too large' values [that would result in larger than | |
339 | * MAX_JIFFY_OFFSET values] mean 'infinite timeout' too. | |
340 | * | |
341 | * - all other values are converted to jiffies by either multiplying | |
342 | * the input value by a factor or dividing it with a factor and | |
343 | * handling any 32-bit overflows. | |
344 | * for the details see __msecs_to_jiffies() | |
345 | * | |
daa67b4b NMG |
346 | * msecs_to_jiffies() checks for the passed in value being a constant |
347 | * via __builtin_constant_p() allowing gcc to eliminate most of the | |
348 | * code, __msecs_to_jiffies() is called if the value passed does not | |
349 | * allow constant folding and the actual conversion must be done at | |
350 | * runtime. | |
351 | * the HZ range specific helpers _msecs_to_jiffies() are called both | |
352 | * directly here and from __msecs_to_jiffies() in the case where | |
353 | * constant folding is not possible. | |
ca42aaf0 | 354 | */ |
accd0b9e | 355 | static __always_inline unsigned long msecs_to_jiffies(const unsigned int m) |
ca42aaf0 | 356 | { |
daa67b4b NMG |
357 | if (__builtin_constant_p(m)) { |
358 | if ((int)m < 0) | |
359 | return MAX_JIFFY_OFFSET; | |
360 | return _msecs_to_jiffies(m); | |
361 | } else { | |
362 | return __msecs_to_jiffies(m); | |
363 | } | |
ca42aaf0 NMG |
364 | } |
365 | ||
ae60d6a0 | 366 | extern unsigned long __usecs_to_jiffies(const unsigned int u); |
e0758676 | 367 | #if !(USEC_PER_SEC % HZ) |
ae60d6a0 NMG |
368 | static inline unsigned long _usecs_to_jiffies(const unsigned int u) |
369 | { | |
370 | return (u + (USEC_PER_SEC / HZ) - 1) / (USEC_PER_SEC / HZ); | |
371 | } | |
ae60d6a0 NMG |
372 | #else |
373 | static inline unsigned long _usecs_to_jiffies(const unsigned int u) | |
374 | { | |
375 | return (USEC_TO_HZ_MUL32 * u + USEC_TO_HZ_ADJ32) | |
376 | >> USEC_TO_HZ_SHR32; | |
377 | } | |
378 | #endif | |
379 | ||
c569a23d NMG |
380 | /** |
381 | * usecs_to_jiffies: - convert microseconds to jiffies | |
382 | * @u: time in microseconds | |
383 | * | |
384 | * conversion is done as follows: | |
385 | * | |
386 | * - 'too large' values [that would result in larger than | |
387 | * MAX_JIFFY_OFFSET values] mean 'infinite timeout' too. | |
388 | * | |
389 | * - all other values are converted to jiffies by either multiplying | |
390 | * the input value by a factor or dividing it with a factor and | |
391 | * handling any 32-bit overflows as for msecs_to_jiffies. | |
392 | * | |
393 | * usecs_to_jiffies() checks for the passed in value being a constant | |
394 | * via __builtin_constant_p() allowing gcc to eliminate most of the | |
395 | * code, __usecs_to_jiffies() is called if the value passed does not | |
396 | * allow constant folding and the actual conversion must be done at | |
397 | * runtime. | |
398 | * the HZ range specific helpers _usecs_to_jiffies() are called both | |
399 | * directly here and from __msecs_to_jiffies() in the case where | |
400 | * constant folding is not possible. | |
401 | */ | |
accd0b9e | 402 | static __always_inline unsigned long usecs_to_jiffies(const unsigned int u) |
ae60d6a0 | 403 | { |
c569a23d NMG |
404 | if (__builtin_constant_p(u)) { |
405 | if (u > jiffies_to_usecs(MAX_JIFFY_OFFSET)) | |
406 | return MAX_JIFFY_OFFSET; | |
407 | return _usecs_to_jiffies(u); | |
408 | } else { | |
409 | return __usecs_to_jiffies(u); | |
410 | } | |
ae60d6a0 NMG |
411 | } |
412 | ||
9ca30850 BW |
413 | extern unsigned long timespec64_to_jiffies(const struct timespec64 *value); |
414 | extern void jiffies_to_timespec64(const unsigned long jiffies, | |
415 | struct timespec64 *value); | |
416 | static inline unsigned long timespec_to_jiffies(const struct timespec *value) | |
417 | { | |
418 | struct timespec64 ts = timespec_to_timespec64(*value); | |
419 | ||
420 | return timespec64_to_jiffies(&ts); | |
421 | } | |
422 | ||
423 | static inline void jiffies_to_timespec(const unsigned long jiffies, | |
424 | struct timespec *value) | |
425 | { | |
426 | struct timespec64 ts; | |
427 | ||
428 | jiffies_to_timespec64(jiffies, &ts); | |
429 | *value = timespec64_to_timespec(ts); | |
430 | } | |
431 | ||
8b9365d7 IM |
432 | extern unsigned long timeval_to_jiffies(const struct timeval *value); |
433 | extern void jiffies_to_timeval(const unsigned long jiffies, | |
434 | struct timeval *value); | |
a399a805 | 435 | |
cbbc719f | 436 | extern clock_t jiffies_to_clock_t(unsigned long x); |
a399a805 ED |
437 | static inline clock_t jiffies_delta_to_clock_t(long delta) |
438 | { | |
439 | return jiffies_to_clock_t(max(0L, delta)); | |
440 | } | |
441 | ||
8b9365d7 IM |
442 | extern unsigned long clock_t_to_jiffies(unsigned long x); |
443 | extern u64 jiffies_64_to_clock_t(u64 x); | |
444 | extern u64 nsec_to_clock_t(u64 x); | |
a1dabb6b | 445 | extern u64 nsecs_to_jiffies64(u64 n); |
b7b20df9 | 446 | extern unsigned long nsecs_to_jiffies(u64 n); |
8b9365d7 IM |
447 | |
448 | #define TIMESTAMP_SIZE 30 | |
1da177e4 LT |
449 | |
450 | #endif |