linux-kernel - Re: [RFC 1/2] printk: Add kernel parameter: mute

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20201022094512.37c9bf5d@gandalf.local.home>
Date:   Thu, 22 Oct 2020 09:45:12 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Petr Mladek <pmladek@...e.com>
Cc:     Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        John Ogness <john.ogness@...utronix.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Shreyas Joshi <shreyas.joshi@...mp.com>,
        shreyasjoshi15@...il.com,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC 1/2] printk: Add kernel parameter: mute_console

On Thu, 22 Oct 2020 13:42:27 +0200
Petr Mladek <pmladek@...e.com> wrote:

> diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
> index fe64a49344bf..63fb96630767 100644
> --- a/kernel/printk/printk.c
> +++ b/kernel/printk/printk.c
> @@ -1207,6 +1207,19 @@ void __init setup_log_buf(int early)
>  	memblock_free(__pa(new_log_buf), new_log_buf_len);
>  }
>  
> +static bool mute_console;
> +
> +static int __init mute_console_setup(char *str)
> +{
> +	mute_console = true;
> +	pr_info("All consoles muted.\n");
> +
> +	return 0;
> +}
> +
> +early_param("mute_console", mute_console_setup);
> +module_param(mute_console, bool, 0644);
> +

Why have both early_param and module_param? What's the purpose of
module_param? Usually that's there to just set a variable, without a need
for another interface. But if you have early_param() that sets
mute_console, isn't that redundant?

-- Steve