1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _TIMEKEEPING_INTERNAL_H 3 #define _TIMEKEEPING_INTERNAL_H 4 5 #include <linux/clocksource.h> 6 #include <linux/spinlock.h> 7 #include <linux/time.h> 8 9 /* 10 * timekeeping debug functions 11 */ 12 #ifdef CONFIG_DEBUG_FS 13 14 DECLARE_PER_CPU(unsigned long, timekeeping_mg_floor_swaps); 15 16 static inline void timekeeping_inc_mg_floor_swaps(void) 17 { 18 this_cpu_inc(timekeeping_mg_floor_swaps); 19 } 20 21 extern void tk_debug_account_sleep_time(const struct timespec64 *t); 22 23 #else 24 25 #define tk_debug_account_sleep_time(x) 26 27 static inline void timekeeping_inc_mg_floor_swaps(void) 28 { 29 } 30 31 #endif 32 33 #ifdef CONFIG_CLOCKSOURCE_VALIDATE_LAST_CYCLE 34 static inline u64 clocksource_delta(u64 now, u64 last, u64 mask) 35 { 36 u64 ret = (now - last) & mask; 37 38 /* 39 * Prevent time going backwards by checking the MSB of mask in 40 * the result. If set, return 0. 41 */ 42 return ret & ~(mask >> 1) ? 0 : ret; 43 } 44 #else 45 static inline u64 clocksource_delta(u64 now, u64 last, u64 mask) 46 { 47 return (now - last) & mask; 48 } 49 #endif 50 51 /* Semi public for serialization of non timekeeper VDSO updates. */ 52 extern raw_spinlock_t timekeeper_lock; 53 54 #endif /* _TIMEKEEPING_INTERNAL_H */ 55