| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef _TIMEKEEPING_INTERNAL_H |
| #define _TIMEKEEPING_INTERNAL_H |
| /* |
| * timekeeping debug functions |
| */ |
| #include <linux/clocksource.h> |
| #include <linux/time.h> |
| |
| #ifdef CONFIG_DEBUG_FS |
| extern void tk_debug_account_sleep_time(struct timespec64 *t); |
| #else |
| #define tk_debug_account_sleep_time(x) |
| #endif |
| |
| #ifdef CONFIG_CLOCKSOURCE_VALIDATE_LAST_CYCLE |
| static inline u64 clocksource_delta(u64 now, u64 last, u64 mask) |
| { |
| u64 ret = (now - last) & mask; |
| |
| /* |
| * Prevent time going backwards by checking the MSB of mask in |
| * the result. If set, return 0. |
| */ |
| return ret & ~(mask >> 1) ? 0 : ret; |
| } |
| #else |
| static inline u64 clocksource_delta(u64 now, u64 last, u64 mask) |
| { |
| return (now - last) & mask; |
| } |
| #endif |
| |
| #endif /* _TIMEKEEPING_INTERNAL_H */ |
