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 static inline u64 clocksource_delta(u64 now, u64 last, u64 mask) 34 { 35 u64 ret = (now - last) & mask; 36 37 /* 38 * Prevent time going backwards by checking the MSB of mask in 39 * the result. If set, return 0. 40 */ 41 return ret & ~(mask >> 1) ? 0 : ret; 42 } 43 44 /* Semi public for serialization of non timekeeper VDSO updates. */ 45 unsigned long timekeeper_lock_irqsave(void); 46 void timekeeper_unlock_irqrestore(unsigned long flags); 47 48 #endif /* _TIMEKEEPING_INTERNAL_H */ 49