nbcon_cpu_emergency_enter(9)

💅 nbcon_cpu_emergency_enter — Kernel API Manual

okay so bestie, welcome to the manual page for nbcon_cpu_emergency_enter(9), live from the Kernel API Manual. this one is short and sweet and honestly kind of iconic for how much it does with so little 🎀

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✨ NAME ✨

nbcon_cpu_emergency_enter — enter an emergency section where printk() messages for that CPU are flushed directly 🚨

🌸 SYNOPSIS 🌸

void nbcon_cpu_emergency_enter (void );

🦋 ARGUMENTS 🦋

• void — no arguments, literally none, she takes nothing and gives everything 💅

⭐ CONTEXT ⭐

Any context. Disables preemption — yes, any context, she's flexible like that, but she does turn preemption off while she's in there 🫶

🔥 DESCRIPTION 🔥

So when you're within an emergency section, printk calls will attempt to flush any pending messages in the ringbuffer. that's the whole vibe: emergency mode on, messages get flushed straight away instead of chilling in the ringbuffer, periodt 💖

ngl this is the emergency-est little function and the ringbuffer does not get to hold onto those messages anymore 😭

👑 SEE ALSO 👑

Kernel file ./kernel/printk/nbcon.c, plus the whole friend group:

• nbcon_state_set(9)
• nbcon_state_read(9)
• nbcon_state_try_cmpxchg(9)
• nbcon_seq_read(9)
• nbcon_seq_force(9)
• nbcon_seq_try_update(9)
• nbcon_context_try_acquire_direct(9)
• nbcon_context_try_acquire_requested(9)
• nbcon_context_try_acquire_handover(9)
• nbcon_context_try_acquire_hostile(9)
• nbcon_context_try_acquire(9)
• nbcon_context_release(9)
• nbcon_context_can_proceed(9)
• nbcon_can_proceed(9)
• __nbcon_context_update_unsafe(9)
• nbcon_enter_unsafe(9)
• nbcon_exit_unsafe(9)
• nbcon_reacquire_nobuf(9)
• nbcon_emit_next_record(9)
• nbcon_kthread_should_wakeup(9)
• nbcon_kthread_func(9)
• nbcon_irq_work(9)
• nbcon_kthreads_wake(9)
• nbcon_kthread_create(9)
• nbcon_get_cpu_emergency_nesting(9)
• nbcon_get_default_prio(9)
• nbcon_allow_unsafe_takeover(9)
• nbcon_legacy_emit_next_record(9)
• __nbcon_atomic_flush_pending_con(9)
• nbcon_atomic_flush_pending_con(9)
• __nbcon_atomic_flush_pending(9)
• nbcon_atomic_flush_pending(9)
• nbcon_atomic_flush_unsafe(9)
• nbcon_cpu_emergency_exit(9)
• nbcon_alloc(9)
• nbcon_free(9)
• nbcon_device_try_acquire(9)
• nbcon_device_release(9)
• nbcon_kdb_try_acquire(9)
• nbcon_kdb_release(9)
• nbcon_write_context_is_braille(9)
• nbcon_braille_try_acquire(9)
• nbcon_braille_release(9)

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and that's the page, bestie 🧚 this diva came from ./kernel/printk and the version-date stamp says October 2026, signed off with her own name nbcon_cpu_emergency_enter(9) like the main character she is 💜✨