I believe I just found the answer for point number 2:

THE REST
M: Linus Torvalds <torvalds@linux-foundation.org>
L: linux-kernel@vger.kernel.org
Q: http://patchwork.kernel.org/project/LKML/list/
T: git git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
S: Buried alive in reporters
F: *
F: */


On Sat, Oct 19, 2019 at 10:33 AM Paulo Almeida <
paulo.miguel.almeida.rodenas@gmail.com> wrote:

> Hi all,
>
> I was reading the KernelJanitor/Todo webpage and found the printk-related
> task that had to be done.
>
> I eventually came across this piece of code that led me to 2 questions
> that I couldn't answer myself
> https://github.com/torvalds/linux/blame/master/init/do_mounts.c#L434-L455
>
> 1 - This specific code block has been around for quite some time and many
> additions using the correct printk(KERN_* were made after it was written.
> Does that mean that this code block is an exception and should be left
> as-is for some technical reason? Or, people have somehow forgotten about it
> and I finally found something to do? :)
>
> 2 - I took a look at the https://www.kernel.org/doc/linux/MAINTAINERS list
> and their respective folders/repos and couldn't find out who would be the
> person who I should eventually send the patches to. Is there any
> "fallthrough" maintainer when there isn't one specified? (Please put me
> straight if I'm not seeing things from the right angle)
>
> Best regards,
>
> Paulo Almeida
>
>