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If a non-boot console is registering and boot consoles exist, the consoles are flushed before being unregistered. This allows the non-boot console to continue where the boot console left off. If for whatever reason flushing fails, the lowest seq found from any of the enabled boot consoles is used. Until now con->seq was checked. However, if it is an nbcon boot console, the function nbcon_seq_read() must be used to read seq because con->seq is not updated for nbcon consoles. Check if it is an nbcon boot console and if so call nbcon_seq_read() to read seq. Also, avoid usage of con->seq as temporary storage of the starting record. Instead, rename console_init_seq() to get_init_console_seq() and just return the value. For nbcon consoles set the sequence via nbcon_seq_force(), for legacy consoles set con->seq. The cleaned design should make sure that the value stays and is set before the console is added to the console list. It also unifies the sequence number initialization for legacy and nbcon consoles. Reviewed-by: John Ogness <john.ogness@linutronix.de> Link: https://lore.kernel.org/r/20240820063001.36405-4-john.ogness@linutronix.de Signed-off-by: Petr Mladek <pmladek@suse.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.