console_cpu_notify(9)

💖 console_cpu_notify(9) — NAME 💖

okay so this is console_cpu_notify(9), straight outta the Kernel API Manual, and it has exactly one job: print deferred console messages after CPU hotplug. periodt. 🎀

✨ SYNOPSIS ✨

int console_cpu_notify (unsigned int cpu );

🌸 ARGUMENTS 🌸

• cpu — unused. literally just vibing there, no cap. 🙈

🦋 DESCRIPTION 🦋

okay bestie, here's the tea: if printk is called from a CPU that is not online yet, the messages will be printed on the console only if there are CON_ANYTIME consoles. 🫶

This function is called when a new CPU comes online (or fails to come up) or goes offline. that's the whole vibe check. 💅

🔥 SEE ALSO 🔥

the kernel file ./kernel/printk/printk.c is home base, and here's the full friend group — every single one invited, no skipping:

• console_list_lock(9)
• console_list_unlock(9)
• console_srcu_read_lock(9)
• console_srcu_read_unlock(9)
• console_lock_spinning_enable(9)
• console_lock_spinning_disable_and_check(9)
• console_trylock_spinning(9)
• printk_parse_prefix(9)
• add_preferred_console(9)
• match_devname_and_update_preferred_console(9)
• console_suspend_all(9)
• console_lock(9)
• console_trylock(9)
• console_unlock(9)
• console_flush_on_panic(9)
• printk_kthreads_shutdown(9)
• console_force_preferred_locked(9)
• pr_flush(9)
• wake_up_klogd(9)
• defer_console_output(9)
• printk_trigger_flush(9)
• printk_timed_ratelimit(9)
• kmsg_dump_register(9)
• kmsg_dump_unregister(9)
• kmsg_dump_desc(9)
• kmsg_dump_get_line(9)
• kmsg_dump_get_buffer(9)
• kmsg_dump_rewind(9)
• console_try_replay_all(9)
• __printk_cpu_sync_wait(9)
• __printk_cpu_sync_try_get(9)
• __printk_cpu_sync_put(9)

that's the page, bestie 🎀 this was console_cpu_notify(9), sourced from ./kernel/printk, dated October 2026. mwah 💋