From: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Petr Mladek <pmladek@suse.com>,
Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
linux-kernel@vger.kernel.org, Dmitry Safonov <dima@arista.com>,
Michal Hocko <mhocko@suse.com>,
Yafang Shao <laoar.shao@gmail.com>
Subject: Re: [PATCH] printk: Add loglevel for "do not print to consoles".
Date: Sat, 25 Apr 2020 01:34:15 +0900 [thread overview]
Message-ID: <78c4a174-bc44-8baa-e731-8e36b62df29f@i-love.sakura.ne.jp> (raw)
In-Reply-To: <20200424122146.163b1680@gandalf.local.home>
On 2020/04/25 1:21, Steven Rostedt wrote:
> On Sat, 25 Apr 2020 01:10:15 +0900
> Tetsuo Handa <penguin-kernel@i-love.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?
Yes. See
https://lkml.kernel.org/r/c95dfafb-fe9c-19d7-8d42-bcd7d0946867@i-love.sakura.ne.jp .
>
> Also, how does one control the log level of prints with KERN_NO_CONSOLES?
I couldn't understand the question.
KERN_NO_CONSOLES is just a flag for not to call call_console_drivers().
Messages printed with printk(KERN_$LOGLEVEL KERN_NO_CONSOLES ...) will be
read by userspace syslog daemon and be filtered based on KERN_$LOGLEVEL.
next prev parent reply other threads:[~2020-04-24 16:35 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-24 2:42 [PATCH] printk: Add loglevel for "do not print to consoles" Tetsuo Handa
2020-04-24 13:28 ` Steven Rostedt
2020-04-24 14:00 ` Tetsuo Handa
2020-04-24 14:31 ` Steven Rostedt
2020-04-24 15:28 ` Tetsuo Handa
2020-04-24 15:42 ` Steven Rostedt
2020-04-24 15:52 ` Dmitry Safonov
2020-04-24 16:10 ` Tetsuo Handa
2020-04-24 16:21 ` Steven Rostedt
2020-04-24 16:34 ` Tetsuo Handa [this message]
2020-04-25 0:46 ` Sergey Senozhatsky
2020-04-25 1:07 ` Tetsuo Handa
2020-04-27 6:21 ` Sergey Senozhatsky
2020-04-28 11:33 ` Tetsuo Handa
2020-04-28 12:18 ` Michal Hocko
2020-04-28 13:11 ` Tetsuo Handa
2020-04-28 15:45 ` Michal Hocko
2020-04-28 16:23 ` Tetsuo Handa
2020-04-29 14:21 ` Michal Hocko
2020-04-29 16:35 ` Tetsuo Handa
2020-05-13 6:26 ` Sergey Senozhatsky
2020-05-13 7:58 ` Tetsuo Handa
2020-05-13 10:04 ` Petr Mladek
2020-05-13 10:49 ` Michal Hocko
2020-05-13 11:24 ` Tetsuo Handa
2020-05-13 12:19 ` Petr Mladek
2020-05-13 12:59 ` Tetsuo Handa
2020-05-14 8:00 ` Petr Mladek
2020-05-14 11:23 ` Tetsuo Handa
2020-05-14 16:26 ` Petr Mladek
2020-05-14 23:24 ` Tetsuo Handa
2020-05-13 11:03 ` Tetsuo Handa
2020-05-13 12:34 ` Petr Mladek
2020-05-13 13:46 ` Steven Rostedt
2020-05-13 14:03 ` Tetsuo Handa
2020-05-13 13:55 ` Steven Rostedt
2020-05-13 15:20 ` Tetsuo Handa
2020-05-06 9:45 ` Tetsuo Handa
2020-05-06 15:26 ` Joe Perches
2020-05-07 0:50 ` Tetsuo Handa
2020-05-07 1:02 ` Joe Perches
2020-05-07 5:13 ` Tetsuo Handa
2020-05-07 5:30 ` Joe Perches
2020-05-07 5:39 ` Tetsuo Handa
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=78c4a174-bc44-8baa-e731-8e36b62df29f@i-love.sakura.ne.jp \
--to=penguin-kernel@i-love.sakura.ne.jp \
--cc=dima@arista.com \
--cc=laoar.shao@gmail.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mhocko@suse.com \
--cc=pmladek@suse.com \
--cc=rostedt@goodmis.org \
--cc=sergey.senozhatsky@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).