nbcon_get_c...ency_nesting(9)

💅 nbcon_get_c...ency_nesting(9) 💅

okay so bestie, welcome to the Kernel API Manual page for nbcon_get_c...ency_nesting(9) — yes, the header is truncated, but the full function name is nbcon_get_cpu_emergency_nesting, and we are getting into it. ✨

🌸 NAME 🌸

nbcon_get_cpu_emergency_nesting — Get the per CPU emergency nesting pointer. 🎀

🦋 SYNOPSIS 🦋

__ref unsigned int * nbcon_get_cpu_emergency_nesting (void );

🍓 ARGUMENTS 🍓

• void — no arguments, not a single one, periodt. 💀

🧚 CONTEXT 🧚

For reading: any context, no cap. For writing: any context which could not be migrated to another CPU. 🫶

⭐ RETURN ⭐

Either a pointer to the per CPU emergency nesting counter of the current CPU, or to the init data during early boot. That is the whole return vibe. 💖

👑 DESCRIPTION 👑

okay so here's the tea: the function is safe for reading per-CPU variables in any context because preemption is disabled if the current CPU is in the emergency state. See also nbcon_cpu_emergency_enter. 🌈

💫 SEE ALSO 💫

kernel file ./kernel/printk/nbcon.c and the whole iconique 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_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_enter(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)

---

that's the page, bestie! source/version: ./kernel/printk; date: October 2026; page: nbcon_get_c...ency_nesting(9). mwah 💋