nbcon_seq_try_update(9)

💖 nbcon_seq_try_update — a Kernel API Manual moment 💖

okay so this is nbcon_seq_try_update(9), straight out of the Kernel API Manual, and yes bestie we're getting into printk console internals together 🫶

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✨ NAME ✨

nbcon_seq_try_update — the "try to update the console sequence number" girlie 💅

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🌸 SYNOPSIS 🌸

void nbcon_seq_try_update (struct nbcon_context *ctxt , u64 new_seq );

like, that's the whole signature. no cap. 🎀

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🦋 ARGUMENTS 🦋

• ctxt — a pointer to an acquire context, and this thing is literally carrying all the info about the acquire mode. main character energy fr fr 👑
• new_seq — the new sequence number we're setting. the fresh value. the glow-up number ✨

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💜 DESCRIPTION 💜

so here's the tea 🍓: ctxt->seq gets updated to the new value of con::nbcon_seq, and that value is expanded to the 64bit value.

and the important part — it could lowkey be a different value than new_seq. 💀 when?? if nbcon_seq_force was used, or if the current context no longer owns the console. in that second case, it will stop printing anyway, so it's giving "we're done here" energy. periodt.

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🌈 SEE ALSO 🌈

the whole friend group, in ./kernel/printk/nbcon.c — kernel file, iconic, no notes:

• nbcon_state_set(9)
• nbcon_state_read(9)
• nbcon_state_try_cmpxchg(9)
• nbcon_seq_read(9)
• nbcon_seq_force(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_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)

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and that's the whole page, bestie, you ate that 🫶 this cutie lives in ./kernel/printk, dated October 2026, and it's literally called nbcon_seq_try_update(9) — go read it again, iykyk 💖🧚‍♀️