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

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Date:   Sat, 25 Apr 2020 09:46:09 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:     Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc:     Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        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 (20/04/24 11:42), Tetsuo Handa wrote:
[..]
> @@ -19,6 +19,7 @@ static inline int printk_get_level(const char *buffer)
>  		switch (buffer[1]) {
>  		case '0' ... '7':
>  		case 'c':	/* KERN_CONT */
> +		case 'S':       /* KERN_NO_CONSOLES */
>  			return buffer[1];
>  		}
>  	}

So this means NO_CONSOLES_AT_ALL, slow + fast ones. I wonder if this
wants to be NO_SLOW_CONSOLES instead. Which then brings us to the
next question - can this be done with per-console loglevel setting?

	-ss