devm_regist..._off_handler(9)

💅 devm_regist..._off_handler(9)

okay so bestie, welcome to the Kernel API Manual ✨ this one's a lil page about devm_register_power_off_handler, which is genuinely such a slay little helper — it's giving "I'll clean up after myself" energy and honestly? obsessed 🫶

---

🌸 NAME 🌸

devm_register_power_off_handler — register a power-off handler 🎀

---

✨ SYNOPSIS ✨

int devm_register_power_off_handler (struct device *dev , int
(*callback)(struct sys_off_data *data) , void *cb_data );

like, that's the whole signature, no notes 💅

---

🦋 ARGUMENTS 🦋

• dev — the device that registers the callback, aka the main character here 👑
• callback — the callback function itself, the lil function that gets the job done ⭐
• cb_data — the callback's argument, its emotional support object fr fr 💖

---

🌈 DESCRIPTION 🌈

So what it does: it registers a resource-managed sys-off handler, with a default priority, and it uses power-off mode. That's the whole vibe ✨

And the return? It returns zero on success, or an error code on failure 😭 so like, check that return value, bestie, don't just ignore it.

---

🎀 SEE ALSO 🎀

this list is long and honestly iconic — it's the whole reboot/power-off friend group 🌸 the kernel file in question is ./kernel/reboot.c, and here's everyone:

• emergency_restart(9)
• register_reboot_notifier(9)
• unregister_reboot_notifier(9)
• register_restart_handler(9)
• unregister_restart_handler(9)
• do_kernel_restart(9)
• kernel_restart(9)
• kernel_halt(9)
• register_sys_off_handler(9)
• unregister_sys_off_handler(9)
• devm_register_sys_off_handler(9)
• devm_register_restart_handler(9)
• register_platform_power_off(9)
• unregister_platform_power_off(9)
• do_kernel_power_off(9)
• kernel_can_power_off(9)
• kernel_power_off(9)
• orderly_poweroff(9)
• orderly_reboot(9)
• hw_failure_emergency_action_func(9)
• hw_failure_emergency_schedule(9)
• __hw_protection_trigger(9)

go read them all, iykylk 💜

---

no cap, that's genuinely everything on the page — every argument, every sibling function, all of it. not me being thorough 💅

---

and that's the tea 🍓 this page lives in ./kernel, dated October 2026, from the Kernel API Manual — mwah, bye bestie 🧚💖