linux-kernel - Re: [RFC] printk/sysrq: Don't play with console

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Date:   Tue, 28 May 2019 13:22:08 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:     Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc:     Dmitry Safonov <dima@...sta.com>, linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>, Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [RFC] printk/sysrq: Don't play with console_loglevel

On (05/28/19 12:21), Tetsuo Handa wrote:
[..]
> What I suggested in my proposal ("printk: Introduce "store now but print later" prefix." at
> https://lore.kernel.org/lkml/1550896930-12324-1-git-send-email-penguin-kernel@I-love.SAKURA.ne.jp/T/#u )
> is "whether the caller wants to defer printing to consoles regarding
> this printk() call". And your suggestion is "whether the caller wants
> to apply ignore_loglevel regarding this printk() call".

I'm not sure about "store now but print later" here. What Dmitry is
talking about:

     bump console_loglevel on *this* particular CPU only,
     not system-wide.
     /* Which is implemented in a form of - all messages from this-CPU
      * only should be printed regardless the loglevel, the rest should
      * pass the usual suppress_message_printing() check. */

	-ss