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All consoles found on for_each_console are registered, meaning that all of them have the CON_ENABLED flag set. Since NBCON was introduced it's important to check if a given console also implements the NBCON callbacks. The function console_is_usable does exactly that. Signed-off-by: Marcos Paulo de Souza <mpdesouza@suse.com> Reviewed-by: Petr Mladek <pmladek@suse.com> Link: https://patch.msgid.link/20251121-printk-cleanup-part2-v2-2-57b8b78647f4@suse.com Signed-off-by: Petr Mladek <pmladek@suse.com>