1 #ifndef _TIMEKEEPING_INTERNAL_H 2 #define _TIMEKEEPING_INTERNAL_H 3 /* 4 * timekeeping debug functions 5 */ 6 #include <linux/clocksource.h> 7 #include <linux/time.h> 8 9 #ifdef CONFIG_DEBUG_FS 10 extern void tk_debug_account_sleep_time(struct timespec64 *t); 11 #else 12 #define tk_debug_account_sleep_time(x) 13 #endif 14 15 #ifdef CONFIG_CLOCKSOURCE_VALIDATE_LAST_CYCLE 16 static inline cycle_t clocksource_delta(cycle_t now, cycle_t last, cycle_t mask) 17 { 18 cycle_t ret = (now - last) & mask; 19 20 /* 21 * Prevent time going backwards by checking the MSB of mask in 22 * the result. If set, return 0. 23 */ 24 return ret & ~(mask >> 1) ? 0 : ret; 25 } 26 #else 27 static inline cycle_t clocksource_delta(cycle_t now, cycle_t last, cycle_t mask) 28 { 29 return (now - last) & mask; 30 } 31 #endif 32 33 extern time64_t __ktime_get_real_seconds(void); 34 35 #endif /* _TIMEKEEPING_INTERNAL_H */ 36