round_jiffies_up(9)

✨ NAME ✨

Okay bestie, meet round_jiffies_up(9) — straight out of the Kernel API Manual. It’s literally the function to round jiffies up to a full second. No cap. 💅

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🛠️ SYNOPSIS 🛠️

The whole flex is:

unsigned long round_jiffies_up (unsigned long j );

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🎀 ARGUMENTS 🎀

• j — the time in (absolute) jiffies that should be rounded. That’s the one and only input, bestie. ⏰

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🌸 DESCRIPTION 🌸

So here’s the tea: this is the same as round_jiffies except that it will never round down. Never. Not even once. 🙈

This is useful for timeouts for which the exact time of firing does not matter too much, as long as they don’t fire too early. It’s giving “do not come for me early” energy, and honestly? Iconic. 🦋

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👀 SEE ALSO 👀

The whole timer squad, in the order the page lists them:

• Kernel file ./kernel/time/timer.c struct timer_base(9)
• __round_jiffies_relative(9)
• round_jiffies(9)
• round_jiffies_relative(9)
• __round_jiffies_up_relative(9)
• round_jiffies_up_relative(9)
• timer_init_key(9)
• mod_timer_pending(9)
• mod_timer(9)
• timer_reduce(9)
• add_timer(9)
• add_timer_local(9)
• add_timer_global(9)
• add_timer_on(9)
• __timer_delete(9)
• timer_delete(9)
• timer_shutdown(9)
• __try_to_del_timer_sync(9)
• timer_delete_sync_try(9)
• __timer_delete_sync(9)
• timer_delete_sync(9)
• timer_shutdown_sync(9)
• fetch_next_timer_interrupt_remote(9)
• timer_unlock_remote_bases(9)
• timer_lock_remote_bases(9)
• timer_base_is_idle(9)
• timer_expire_remote(9)
• get_next_timer_interrupt(9)
• timer_base_try_to_set_idle(9)
• timer_clear_idle(9)
• __run_timers(9)

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That’s the whole page, bestie 🫶 — source/version: ./kernel/time; date: October 2026; title: round_jiffies_up(9). Bye 💖