__printk_cpu_sync_wait(9)

💅 __printk_cpu_sync_wait (9) — from the Kernel API Manual, bestie 💖

okay so this page is about __printk_cpu_sync_wait from the Kernel API Manual, and it's short but iconic, so let's get into it 🎀

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✨ NAME ✨

__printk_cpu_sync_wait — literally just busy wait until the printk cpu-reentrant spinning lock is not owned by any CPU 🌀👑

like, you're spinning. on purpose. until nobody owns that lock. that's the whole vibe check. no cap 💅

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🦋 SYNOPSIS 🦋

void __printk_cpu_sync_wait (void );

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🌸 ARGUMENTS 🌸

• void — no arguments 💖 that's it. nothing to pass in. zero. zilch. the void is the argument and the argument is the void 🙈

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⭐ CONTEXT ⭐

Any context. yes bestie, any — every context, all of them, she's welcome everywhere 🌈✨

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👑 SEE ALSO 👑

so there's a whole friend group here, and we are NOT skipping a single one, iykyk 🫶

The kernel file is ./kernel/printk/printk.c, and the crew is:

• 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_cpu_notify(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_try_get(9)
• __printk_cpu_sync_put(9)

like, that's the whole group chat and they all ate 🔥

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ngl, the name literally has wait in it twice-ish and it does exactly what it says: you wait. by spinning. in any context. slay but stay aware 🧚💜

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and that's the page!! mwah 💋 sign-off time: this one lives in ./kernel/printk, dated October 2026, and it's __printk_cpu_sync_wait(9) all the way down ⭐🎀🦋