preempt_notifier_unregister(9)

💅 preempt_notifier_unregister — like, the Kernel API Manual tea 💅

okay so bestie, we're in the Kernel API Manual today and the main character is preempt_notifier_unregister(9). she's short, she's sweet, she's lowkey a one-job icon. let's get into it ✨

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🌸 NAME 🌸

preempt_notifier_unregister — no longer interested in preemption notifications

yes queen, you're literally breaking up with the notifications. it's giving "we need to talk" but in kernel form 💔

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🎀 SYNOPSIS 🎀

void preempt_notifier_unregister (struct preempt_notifier *notifier );

returns void btw — she gives nothing back, she just does 💅

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🦋 ARGUMENTS 🦋

• notifier — the notifier struct you wanna unregister. that's it. that's the whole argument. hand her the struct and she'll handle it 🫶

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✨ DESCRIPTION ✨

okay so here's the thing, and I need you to listen: this is *not* safe to call from within a preemption notifier.

🚨 fr fr, do NOT do it. not from inside a preemption notifier. it says *not* with the asterisks and everything, that's how serious it is 😭

that's genuinely the whole description. short king energy 👑

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🔥 SEE ALSO 🔥

the whole kernel sched friend group showed up for this one, no cap:

• Kernel file ./kernel/sched/core.c
• wake_q_add(9)
• wake_q_add_safe(9)
• task_curr(9)
• try_to_wake_up(9)
• task_call_func(9)
• cpu_curr_snapshot(9)
• wake_up_process(9)
• preempt_notifier_register(9)
• prepare_task_switch(9)
• finish_task_switch(9)
• schedule_tail(9)
• schedule_preempt_disabled(9)
• preempt_schedule_notrace(9)
• init_idle(9)
• curr_task(9)

like, the entire group chat got invited 🫶✨

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and that's the page!! 💖 sourced straight from ./kernel/sched, dated October 2026, and filed under preempt_notifier_unregister(9) — mwah, slay, periodt 🎀💅👑