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

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Message-ID: <CAHk-=wi35ezFsFuHHJ-MbrUAUj0ohQJM4iHHw8n1vyqXMYbVcg@mail.gmail.com>
Date:   Fri, 24 May 2019 10:17:34 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Subject: Re: [PATCH] printk: Monitor change of console loglevel.

On Fri, May 10, 2019 at 8:19 AM Tetsuo Handa
<penguin-kernel@...ove.sakura.ne.jp> 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