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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /kernel/time/timekeeping_internal.h | |
parent | Initial commit. (diff) | |
download | linux-upstream.tar.xz linux-upstream.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'kernel/time/timekeeping_internal.h')
-rw-r--r-- | kernel/time/timekeeping_internal.h | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/kernel/time/timekeeping_internal.h b/kernel/time/timekeeping_internal.h new file mode 100644 index 000000000..4ca2787d1 --- /dev/null +++ b/kernel/time/timekeeping_internal.h @@ -0,0 +1,39 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _TIMEKEEPING_INTERNAL_H +#define _TIMEKEEPING_INTERNAL_H + +#include <linux/clocksource.h> +#include <linux/spinlock.h> +#include <linux/time.h> + +/* + * timekeeping debug functions + */ +#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 + +/* Semi public for serialization of non timekeeper VDSO updates. */ +extern raw_spinlock_t timekeeper_lock; + +#endif /* _TIMEKEEPING_INTERNAL_H */ |