linux-kernel - Re: [RFC PATCH] cmdline: Hide "debug" from /proc/cmdline

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Message-ID: <20140402204927.22dedef3@gandalf.local.home>
Date:	Wed, 2 Apr 2014 20:49:27 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Mateusz Guzik <mguzik@...hat.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...en8.de>,
	Ingo Molnar <mingo@...nel.org>, Mel Gorman <mgorman@...e.de>,
	Kay Sievers <kay@...y.org>
Subject: Re: [RFC PATCH] cmdline: Hide "debug" from /proc/cmdline

On Thu, 3 Apr 2014 00:12:13 +0200
Mateusz Guzik <mguzik@...hat.com> wrote:

 
> Well, parsing kernel cmdline by systemd is a bad idea, and hiding
> "debug" is even worse. What will happen when the next keyword clashes?
> And how should I check the kernel is booted with "debug"?

No, I think you got it backwards. Hiding "debug" is a bad idea, having
systemd abuse the hell out of it is even worse.


> 
> If there is a real need to pass arguments to systemd, how about a
> dedicated option (initargs= or whatever, where it has to be last in
> cmdline), then systemd would be spawned with these arguments and would
> just go over its argv.
> 

No, the correct solution was to have systemd use its own flag. Say
"systemd.debug", which I believe from froward reading my emails, Greg
has already sent a patch to do so.

That solution was even suggested in the BZ and was turned down with the
quote I had in my change log. That we don't own the generic terms, even
though it's our f*cking command line, not theirs!

-- Steve
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