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

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Message-ID: <20160426110905.GR3448@twins.programming.kicks-ass.net>
Date:	Tue, 26 Apr 2016 13:09:05 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Bjørn Mork <bjorn@...k.no>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Linus Torvalds <torvalds@...ux-foundation.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

On Tue, Apr 26, 2016 at 12:43:49PM +0200, Bjørn Mork wrote:
> 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

Thanks for providing the links, I did remember all that.

Its one of the many reasons why I recommend against running
systemd(isease).