linux-kernel - Re: [PATCH v2] printk: Add kernel parameter to disable writes to /dev/kmsg

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Message-ID: <871t5svee2.fsf@nemi.mork.no>
Date:	Tue, 26 Apr 2016 12:43:49 +0200
From:	Bjørn Mork <bjorn@...k.no>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Borislav Petkov <bp@...en8.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
Subject: Re: [PATCH v2] printk: Add kernel parameter to disable writes to /dev/kmsg

Ingo Molnar <mingo@...nel.org> writes:

>  static int parse_proc_cmdline_item(const char *key, const char *value) {
>
>         /*
>          * The systemd.log_xyz= settings are parsed by all tools, and
>          * so is "debug".
>          *
>          * However, "quiet" is only parsed by PID 1, and only turns of
>          * status output to /dev/console, but does not alter the log
>          * level.
>          */
>
>         if (streq(key, "debug") && !value)
>                 log_set_max_level(LOG_DEBUG);
>
>         else if (streq(key, "systemd.log_target") && value) {
>
> Why systemd does this fully knowing that other software (such as the kernel) 
> already uses 'debug', while systemd already has the 'system.*' parameter namespace 
> is left up to the reader...

A couple of links to save that reader from making futile comments:
https://lkml.org/lkml/2014/4/2/415
https://bugs.freedesktop.org/show_bug.cgi?id=76935


Bjørn