do_kernel_power_off(9)

💅 do_kernel_power_off(9) — the Kernel API Manual bestie 🎀

okay so picture this: it's kernel API manual o'clock, and we're learning do_kernel_power_off — the function that literally says "bye bestie" to your whole machine 🔥

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✨ NAME ✨

do_kernel_power_off — Execute kernel power-off handler call chain 👑

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🦋 SYNOPSIS 🦋

void do_kernel_power_off (void );

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🌸 ARGUMENTS 🌸

• void — no arguments, ngl. zero. nada. it takes nothing and it gives everything 💀

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💖 DESCRIPTION 💖

So here's the vibe: this one is expected to be called as the last step of the power-off sequence. like, the final boss of shutting down. the last text before you go to sleep 🫶

It powers off the system immediately if a power-off handler function has been registered. slay. iconic. the machine is gone.

Otherwise? it does nothing. literally nothing. no handler, no power-off, no drama 🙈

⚠️ heads up bestie — "immediately" is not a little bit immediate. if a handler is registered, the system goes down right then. no take-backs, no vibe check, no saving your unsaved work. 💀

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🧚 SEE ALSO 🧚

okay this list is long but every single one of these is a friend of the function, so let's give them all their moment ✨

Kernel file ./kernel/reboot.c — the whole reboot.c neighborhood, go say hi 🏡

• 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_power_off_handler(9)
• devm_register_restart_handler(9)
• register_platform_power_off(9)
• unregister_platform_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)

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🌈 and that's the whole page, bestie!! this came straight out of the ./kernel source in October 2026, and it's filed under do_kernel_power_off(9) in the Kernel API Manual — go power off responsibly, mwah 💜🫶