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Unfortunately it is not known if a boot console and a regular (legacy or nbcon) console use the same hardware. For this reason they must not be allowed to print simultaneously. For legacy consoles this is not an issue because they are already synchronized with the boot consoles using the console lock. However nbcon consoles can be triggered separately. Add a global flag @have_boot_console to identify if any boot consoles are registered. This will be used in follow-up commits to ensure that boot consoles and nbcon consoles cannot print simultaneously. Signed-off-by: John Ogness <john.ogness@linutronix.de> Reviewed-by: Petr Mladek <pmladek@suse.com> Link: https://lore.kernel.org/r/20240820063001.36405-22-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.