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