ktime_real_to_base_clock(9)

💅 ktime_real_to_base_clock(9) — Kernel API Manual glow-up 💅

okay so bestie, welcome to the ktime_real_to_base_clock(9) page from the Kernel API Manual. This is the lil function that handles one very specific time conversion, and we're gonna get into it. 🫶

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🌸 NAME 🌸

ktime_real_to_base_clock — Convert CLOCK_REALTIME timestamp to a base clock timestamp. That's the assignment, no cap. ✨

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🦋 SYNOPSIS 🦋

the whole call looks like this, character for character:

bool ktime_real_to_base_clock (ktime_t treal , enum clocksource_ids base_id , u64 *cycles );

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🎀 ARGUMENTS 🎀

• treal — the CLOCK_REALTIME timestamp to convert. 💖
• base_id — the base clocksource id. 👑
• cycles — a pointer to store the converted base clock timestamp. 🍓

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✨ DESCRIPTION ✨

Converts a supplied, future realtime clock value to the corresponding base clock value. That's it, that's the vibe — future realtime clock value in, corresponding base clock value out. 💫

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🔥 RETURN 🔥

It gives you true if the conversion is successful, and false otherwise. Periodt. 💅

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🌈 SEE ALSO 🌈

y'all know the drill — peep the kernel file ./kernel/time/timekeeping.c and these related pages, all iconic, all linked:

• Kernel file ./kernel/time/timekeeping.c
• struct tk_fast(9)
• tk_setup_internals(9)
• update_fast_timekeeper(9)
• ktime_get_mono_fast_ns(9)
• ktime_get_raw_fast_ns(9)
• ktime_get_boot_fast_ns(9)
• ktime_get_tai_fast_ns(9)
• ktime_get_real_fast_ns(9)
• halt_fast_timekeeper(9)
• pvclock_gtod_register_notifier(9)
• pvclock_gtod_unregister_notifier(9)
• timekeeping_forward_now(9)
• ktime_get_real_ts64(9)
• ktime_mono_to_any(9)
• ktime_get_raw(9)
• ktime_get_ts64(9)
• ktime_get_seconds(9)
• ktime_get_real_seconds(9)
• __ktime_get_real_seconds(9)
• ktime_get_snapshot_id(9)
• adjust_historical_crosststamp(9)
• get_device_system_crosststamp(9)
• timekeeping_clocksource_has_base(9)
• do_settimeofday64(9)
• __timekeeping_inject_offset(9)
• timekeeping_notify(9)
• ktime_get_raw_ts64(9)
• timekeeping_valid_for_hres(9)
• timekeeping_max_deferment(9)
• read_persistent_clock64(9)
• read_persistent_wall_and_boot_offset(9)
• __timekeeping_inject_sleeptime(9)
• timekeeping_inject_sleeptime64(9)
• timekeeping_resume(9)
• update_wall_time(9)
• getboottime64(9)
• ktime_get_coarse_real_ts64_mg(9)
• ktime_get_real_ts64_mg(9)
• ktime_get_update_offsets_now(9)
• random_get_entropy_fallback(9)
• do_adjtimex(9)
• hardpps(9)
• ktime_get_aux(9)
• ktime_get_aux_ts64(9)

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big cozy sign-off: this page is chillin' in ./kernel/time, dated October 2026, from the Kernel API Manual — xoxo, stay timestamped bestie 💖🎀