kthread_del...ork_timer_fn(9)

💅 kthread_del...ork_timer_fn(9)

okay so real talk, this is a page from the Kernel API Manual and it's about one tiny little callback that honestly has main character energy for something so small ✨

---

🎀 NAME 🎀

kthread_delayed_work_timer_fn — bestie, this is the callback that queues up the associated kthread delayed work the moment the timer expires. that's it. that's the whole job. and it does it flawlessly 💖

---

✨ SYNOPSIS ✨

void kthread_delayed_work_timer_fn (struct timer_list *t );

literally one argument, no cap. very demure, very mindful 🦋

---

🌸 ARGUMENTS 🌸

• t — pointer to the expired timer 🕰️ like, the timer that just went off. that's the whole vibe.

---

💜 DESCRIPTION 💜

so the format of this function is defined by struct timer_list — that struct is the blueprint, the moment, the blueprint-of-the-moment 🫶

and listen, important caveat incoming: it should have been called from an irqsafe timer with irq already off 🔥 like, that's the contract, that's the environment it expects to wake up in. don't be out here calling it in some other context, it's not built for that 😭

---

👑 SEE ALSO 👑

the kernel file is ./kernel/kthread.c and honestly the whole friend group is here, so let's give everyone their moment 🌈

• kthread_should_stop(9)
• kthread_should_park(9)
• kthread_freezable_should_stop(9)
• kthread_func(9)
• kthread_data(9)
• kthread_probe_data(9)
• kthread_complete_and_exit(9)
• kthread_create_on_node(9)
• kthread_bind(9)
• kthread_create_on_cpu(9)
• kthread_unpark(9)
• kthread_park(9)
• kthread_stop(9)
• kthread_stop_put(9)
• kthread_affine_preferred(9)
• kthreads_update_housekeeping(9)
• kthread_worker_fn(9)
• kthread_create_worker_on_node(9)
• kthread_create_worker_on_cpu(9)
• kthread_queue_work(9)
• kthread_queue_delayed_work(9)
• kthread_flush_work(9)
• kthread_mod_delayed_work(9)
• kthread_cancel_work_sync(9)
• kthread_cancel_delayed_work_sync(9)
• kthread_flush_worker(9)
• kthread_destroy_worker(9)
• kthread_use_mm(9)
• kthread_unuse_mm(9)
• kthread_associate_blkcg(9)
• kthread_blkcg(9)

like, the entire roster. squad goals fr fr 💀

---

and that's the page!! sign-off time 🎀 this one lives under ./kernel, and the version stamp says October 2026 — so mark your calendars bestie, iconic behavior only 🌟💅