console_loc...le_and_check(9)

💖 NAME 💖

okay bestie, meet console_lock_spinning_disable_and_check — yes, the whole mouthful — from the Kernel API Manual. Its whole deal is to mark the end of code where another thread was able to busy wait, and check if there is a waiter. That’s the assignment. 🫶

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🔥 SYNOPSIS 🔥

int console_lock_spinning_disable_and_check (int cookie );

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🍓 ARGUMENTS 🍓

• cookie — the cookie returned from console_srcu_read_lock.

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✨ DESCRIPTION ✨

So this gets called at the end of the section where spinning is allowed. It has two functions, and no we are not skipping either one:

1. It’s a signal that it is no longer safe to start busy waiting for the lock.
2. It checks if there is a busy waiter and passes the lock rights to her.

⚠️ Important: Callers lose both the console_lock and the SRCU read lock if there was a busy waiter. They must not touch items synchronized by console_lock or SRCU read lock in this case. Like, do not touch. Not even a little. 😭

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🌈 RETURN 🌈

1 if the lock rights were passed, 0 otherwise. That’s the whole vibe check. ⭐

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👑 SEE ALSO 👑

Kernel file: ./kernel/printk/printk.c.

The whole (9) squad:

• console_list_lock(9)
• console_list_unlock(9)
• console_srcu_read_lock(9)
• console_srcu_read_unlock(9)
• console_lock_spinning_enable(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_wait(9)
• __printk_cpu_sync_try_get(9)
• __printk_cpu_sync_put(9)

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okay that’s the page, bestie! 💖 source/version: ./kernel/printk · date: October 2026 · manual: Kernel API Manual · page: console_lock_spinning_disable_and_check(9). byeee 🎀✨