Re: [PATCH] printk: Monitor change of console loglevel.

[Linus Torvalds]

On Fri, May 10, 2019 at 8:19 AM Tetsuo Handa
<penguin-kernel@xxxxxxxxxxxxxxxxxxx> wrote:
>
> This patch is intended for testing on linux-next.git only, and
> will be removed after we found what is wrong.

Honestly, wouldn't it be much better to try to come up with a patch
that might be acceptable in general.

For example, how about a config option that just hardcodes
console_loglevel as a compile-time constant, and where you can't
change it at all? There are not that many paths that set the console
log-level, and the few that do could be made to use

    set_console_log_level(x);

instead of

    console_loglevel = x;

like they do.

We already have a number of loglevel config options, adding another
that says "fix log levels at compile time" doesn't sound too bad, and
I suspect a patch that introduces that set_console_log_level() kind of
model and just makes "console_loglevel" a constant #define wouldn't be
too ugly.

A config option or two that help syzbot doesn't sound like a bad idea to me.

Hmm?

                   Linus