From mboxrd@z Thu Jan  1 00:00:00 1970
From: greg@kroah.com (Greg KH)
Date: Mon, 19 Jun 2017 08:55:22 +0800
Subject: Is there any way to add an =?utf-8?Q?a?=
	=?utf-8?Q?ttribute_under_sysfs_at_the_=E2=80=9Cplatform=E2=80=9D?=
	level?
In-Reply-To: <20170618143836.GA7147@home>
References: <20170618143836.GA7147@home>
Message-ID: <20170619005522.GB995@kroah.com>
To: kernelnewbies@lists.kernelnewbies.org
List-Id: kernelnewbies.lists.kernelnewbies.org

On Sun, Jun 18, 2017 at 05:38:36PM +0300, Roman Storozhenko wrote:
> Hello everybody!
> 
> I am trying to modify "pcspkr" driver undere linux kernel source tree. I added a new line there:
> 
> sample_id_dir = kobject_create_and_add("devices/platform/pcspkr/sample", NULL);

Ick, really?  What are you trying to do with "raw" kobjects?

> It works and creates kobject without errors. I checked this in the driver code and in the dmesg output. But "sample" catalog isn't appear under "/sys/devices/platform/pcspkr/".

Are you sure?  Odds are you really did create a kobject with that name,
but note, the name will have '/' characters in it :)

If you want a kobject in a specific directory, you have to give it the
parent kobject directory directly, you can not give a "path" to the
kobject name, sorry, that's not how it works.

The kobject documentation should help you out here, have you read it?

good luck!

greg k-h