linux-kernel - Re: [RFC][PATCH 2/2] printk: Add /sys/consoles/${con}/ and maxlevel attribute

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Date:   Tue, 4 Apr 2017 23:30:50 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Calvin Owens <calvinowens@...com>
Cc:     Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.cz>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Manuel Schölling <manuel.schoelling@....de>,
        Hans de Goede <hdegoede@...hat.com>,
        Paul Burton <paul.burton@...tec.com>,
        <linux-kernel@...r.kernel.org>, <kernel-team@...com>
Subject: Re: [RFC][PATCH 2/2] printk: Add /sys/consoles/${con}/ and maxlevel
 attribute

On Tue, 4 Apr 2017 16:03:20 -0700
Calvin Owens <calvinowens@...com> wrote:

> This does the simplest possible thing: add a directory at the root of
> sysfs that allows setting the "maxlevel" parameter for each console.
> 
> We can let kobject destruction race with console removal: if it does,
> maxlevel_{show,store}() will safely fail with -ENODEV. This is a little
> weird, but avoids embedding the kobject and therefore needing to totally
> refactor the way we handle console struct lifetime.

Can you also add a patch that allows this to be set on the kernel
command line, when the consoles are defined.

-- Steve

> 
> Signed-off-by: Calvin Owens <calvinowens@...com>