linux-kernel - Re: [PATCH 0/6] Add a per-dimm structure

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Date:	Wed, 14 Mar 2012 23:22:21 -0300
From:	Mauro Carvalho Chehab <mchehab@...hat.com>
To:	Greg KH <gregkh@...uxfoundation.org>
CC:	Linux Edac Mailing List <linux-edac@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/6] Add a per-dimm structure

Em 14-03-2012 20:32, Greg KH escreveu:
> On Wed, Mar 14, 2012 at 07:20:01PM -0300, Mauro Carvalho Chehab wrote:
>>> Easy rule to remember, never mix "raw" kobjects and 'struct device',
>>> which is what you would be doing here, right?  We can handle many
>>> hundreds of thousands of files and devices in a single directory, no
>>> problem.
>>
>> No. They're all generated with raw kobjects, using kobject_init_and_add() or
>> sysfs_create_file() calls.
> 
> Ick, no.
> 
> Please, never use "raw" kobjects.  Why doesn't 'struct device' work for
> you properly here?  You just messed userspace all up in that it can not
> properly account for the parts of sysfs here in the device tree.
> 
> Anything below /sys/devices/ should be using 'struct device' unless
> there is a _very_ good reason not to.

The raw kobjects logic is there since the beginning of the edac. I've no
idea why.

I remember a few years ago I tried to create a virtual class in order to
create the EDAC devices, in order to use struct devices, but the sysfs
nodes were created outside /sys/devices/system, breaking the ABI.

Not sure what changed on sysfs since then, but, on the time I looked
on it, I was unable to find an easy way to solve it.

So, I gave up and just kept it as-is.

> 
> thanks,
> 
> greg k-h

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