timer_shutdown(9)

💅 timer_shutdown(9) 💅

okay so bestie, welcome to the Kernel API Manual entry for timer_shutdown — yes that's the manual name, yes we're folding it in up here, no we're not being weird about it 🎀

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✨ NAME ✨

timer_shutdown — deactivate a timer and, like, prevent it from ever rearming 🫶

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🌸 SYNOPSIS 🌸

int timer_shutdown (struct timer_list *timer );

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🦋 ARGUMENTS 🦋

• timer — the timer you want deactivated, bestie. that one. ✨

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💖 DESCRIPTION 💖

so here's the vibe: this function does not wait for a timer callback that might eventually be running on a different CPU 😭 — nope, it just prevents rearming of the timer. that's the whole point.

and the way that any attempt to arm timer after this function returns will be silently ignored? iconic. no error, no noise, just ✨ ignored ✨.

this function is useful for teardown code, but ngl — it should only be used when timer_shutdown_sync cannot be invoked due to locking or context constraints. periodt. don't just reach for this one because it's chill.

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🌈 RETURN 🌈

• 0 — the timer was not pending 💀
• 1 — the timer was pending 🔥

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⭐ SEE ALSO ⭐

these are the friends in the group chat, iykyk 💜

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(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), __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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and that's the page, bestie 🧚💫 this lil gem lives at ./kernel/time, dated October 2026, and its whole identity is timer_shutdown(9) — main character energy, honestly 👑🌸