linux-kernel - Re: [PATCH] printk: Add loglevel for "do not print to consoles".

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Message-ID: <20200424122146.163b1680@gandalf.local.home>
Date:   Fri, 24 Apr 2020 12:21:46 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc:     Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        linux-kernel@...r.kernel.org, Dmitry Safonov <dima@...sta.com>,
        Michal Hocko <mhocko@...e.com>,
        Yafang Shao <laoar.shao@...il.com>
Subject: Re: [PATCH] printk: Add loglevel for "do not print to consoles".

On Sat, 25 Apr 2020 01:10:15 +0900
Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp> wrote:

> KERN_NO_CONSOLES is a mechanism for implementing user decided policy. As long as
> userspace can control whether to use KERN_NO_CONSOLES (e.g. sysctl), there should
> be no problem with adding KERN_NO_CONSOLES (i.e. this patch) to the kernel side.

How would you define what gets "KERN_NO_CONSOLES"? Is it going to be a
sysctl switch?

Also, how does one control the log level of prints with KERN_NO_CONSOLES?

-- Steve