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console_flush_all prints all remaining records to all usable consoles whilst its caller holds console_lock. This can result in large waiting times for those waiting for console_lock especially where there is a large volume of records or where the console is slow (e.g. serial). Let's extract the parts of this function which print a single record into a new function named console_flush_one_record. This can later be used for functions that will release and reacquire console_lock between records. This commit should not change existing functionality. Reviewed-by: Petr Mladek <pmladek@suse.com> Signed-off-by: Andrew Murray <amurray@thegoodpenguin.co.uk> Reviewed-by: John Ogness <john.ogness@linutronix.de> Link: https://patch.msgid.link/20251020-printk_legacy_thread_console_lock-v3-1-00f1f0ac055a@thegoodpenguin.co.uk Signed-off-by: Petr Mladek <pmladek@suse.com>