Re: [RFC 1/2] printk: Add kernel parameter: mute_console

[Steven Rostedt <rostedt@goodmis.org>]

On Thu, 22 Oct 2020 13:42:27 +0200
Petr Mladek <pmladek@suse.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