| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef _TIMEKEEPING_INTERNAL_H |
| #define _TIMEKEEPING_INTERNAL_H |
| |
| #include <linux/clocksource.h> |
| #include <linux/spinlock.h> |
| #include <linux/time.h> |
| |
| /* |
| * timekeeping debug functions |
| */ |
| #ifdef CONFIG_DEBUG_FS |
| extern void tk_debug_account_sleep_time(const struct timespec64 *t); |
| #else |
| #define tk_debug_account_sleep_time(x) |
| #endif |
| |
| static inline u64 clocksource_delta(u64 now, u64 last, u64 mask, u64 max_delta) |
| { |
| u64 ret = (now - last) & mask; |
| |
| /* |
| * Prevent time going backwards by checking the result against |
| * @max_delta. If greater, return 0. |
| */ |
| return ret > max_delta ? 0 : ret; |
| } |
| |
| /* Semi public for serialization of non timekeeper VDSO updates. */ |
| extern raw_spinlock_t timekeeper_lock; |
| |
| #endif /* _TIMEKEEPING_INTERNAL_H */ |
