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

Andrew Morton
2014-05-02T22:34:13Z

On Mon, 07 Apr 2014 14:24:45 +0930 Rusty Russell <rusty@rustcorp.com.au> wrote:

> Subject: param: hand arguments after -- straight to init
>
> The kernel passes any args it doesn't need through to init, except it
> assumes anything containing '.' belongs to the kernel (for a module).
> This change means all users can clearly distinguish which arguments
> are for init.
>
> For example, the kernel uses debug ("dee-bug") to mean log everything to
> the console, where systemd uses the debug from the Scandinavian "day-boog"
> meaning "fail to boot". If a future versions uses argv[] instead of
> reading /proc/cmdline, this confusion will be avoided.
>
> eg: test 'FOO="this is --foo"' -- 'systemd.debug="true true true"'
>
> Gives:
> argv[0] = '/debug-init'
> argv[1] = 'test'
> argv[2] = 'systemd.debug=true true true'
> envp[0] = 'HOME=/'
> envp[1] = 'TERM=linux'
> envp[2] = 'FOO=this is --foo'

This (user-facing) feature doesn't seem to have been documented
anywhere. Documentation/kernel-parameters.txt, I guess.