From 76cb841cb886eef6b3bee341a2266c76578724ad Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Mon, 6 May 2024 03:02:30 +0200 Subject: Adding upstream version 4.19.249. Signed-off-by: Daniel Baumann --- kernel/time/timekeeping_internal.h | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) create mode 100644 kernel/time/timekeeping_internal.h (limited to 'kernel/time/timekeeping_internal.h') diff --git a/kernel/time/timekeeping_internal.h b/kernel/time/timekeeping_internal.h new file mode 100644 index 000000000..bcbb52db2 --- /dev/null +++ b/kernel/time/timekeeping_internal.h @@ -0,0 +1,34 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _TIMEKEEPING_INTERNAL_H +#define _TIMEKEEPING_INTERNAL_H +/* + * timekeeping debug functions + */ +#include +#include + +#ifdef CONFIG_DEBUG_FS +extern void tk_debug_account_sleep_time(const 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 */ -- cgit v1.2.3