projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 5c83545f CC |
2 | #ifndef _TIMEKEEPING_INTERNAL_H |
| 3 | #define _TIMEKEEPING_INTERNAL_H | |
| 19d0070a | 4 | |
| 3a978377 | 5 | #include <linux/clocksource.h> |
| 19d0070a | 6 | #include <linux/spinlock.h> |
| 5c83545f CC |
7 | #include <linux/time.h> |
| 8 | ||
| 19d0070a TG |
9 | /* |
| 10 | * timekeeping debug functions | |
| 11 | */ | |
| 5c83545f | 12 | #ifdef CONFIG_DEBUG_FS |
| 985e6950 | 13 | extern void tk_debug_account_sleep_time(const struct timespec64 *t); |
| 5c83545f CC |
14 | #else |
| 15 | #define tk_debug_account_sleep_time(x) | |
| 16 | #endif | |
| 17 | ||
| 09ec5442 | 18 | #ifdef CONFIG_CLOCKSOURCE_VALIDATE_LAST_CYCLE |
| a5a1d1c2 | 19 | static inline u64 clocksource_delta(u64 now, u64 last, u64 mask) |
| 09ec5442 | 20 | { |
| a5a1d1c2 | 21 | u64 ret = (now - last) & mask; |
| 09ec5442 | 22 | |
| 1f45f1f3 YY |
23 | /* |
| 24 | * Prevent time going backwards by checking the MSB of mask in | |
| 25 | * the result. If set, return 0. | |
| 26 | */ | |
| 27 | return ret & ~(mask >> 1) ? 0 : ret; | |
| 09ec5442 TG |
28 | } |
| 29 | #else | |
| a5a1d1c2 | 30 | static inline u64 clocksource_delta(u64 now, u64 last, u64 mask) |
| 3a978377 TG |
31 | { |
| 32 | return (now - last) & mask; | |
| 33 | } | |
| 09ec5442 | 34 | #endif |
| 3a978377 | 35 | |
| 19d0070a TG |
36 | /* Semi public for serialization of non timekeeper VDSO updates. */ |
| 37 | extern raw_spinlock_t timekeeper_lock; | |
| 38 | ||
| 5c83545f | 39 | #endif /* _TIMEKEEPING_INTERNAL_H */ |