linux-kernel - Re: [RFC] kobject/kset/ktype documentation and example code updated

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Message-ID: <476AF124.6090404@oracle.com>
Date:	Thu, 20 Dec 2007 14:48:04 -0800
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Greg KH <greg@...ah.com>
CC:	linux-kernel@...r.kernel.org, Kay Sievers <kay.sievers@...y.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Jonathan Corbet <corbet@....net>
Subject: Re: [RFC] kobject/kset/ktype documentation and example code updated

Greg KH wrote:
> On Thu, Dec 20, 2007 at 02:29:52PM -0800, Randy Dunlap wrote:
>> On Thu, 20 Dec 2007 14:12:52 -0800 Greg KH wrote:
>>
>>> On Thu, Dec 20, 2007 at 02:06:59PM -0800, Randy Dunlap wrote:
>>>> On Thu, 20 Dec 2007 13:27:00 -0800 Greg KH wrote:
>>>>> On Wed, Dec 19, 2007 at 10:32:06PM -0800, Randy Dunlap wrote:
>>>>>> On Wed, 19 Dec 2007 16:30:31 -0800 Greg KH wrote:
>>>>>>>     int kobject_uevent(struct kobject *kobj, enum kobject_action action);
>>>>>>>
>>>>>>> Use the KOBJ_ADD action for when the kobject is first added to the kernel.
>>>>>>> This should be done only after any attributes or children of the kobject
>>>>>>> have been initialized properly, as userspace will instantly start to look
>>>>>> 		s/will/may/
>>>>> No, it's usually a "will", as udev is damm fast these days :)
>>>> But that's the point.  It assumes that udev is being used.  :(
>>> Yes, kernel developers need to be aware that udev _will_ be used, you
>>> can not do things that will assume it is not running.
>> so are you saying that udev is required now?
>> I missed that information somehow/somewhere.
> 
> No, not at all, it's not required.
> 
> Just that if you are creating kobjects, you need to be aware that there
> are programs out there, like udev[1], that expect once the kobject is
> announced, to have all of the attributes present at the same time.
> 
> Does that explain it better?

Yes.  Thanks.

> thanks,
> 
> greg k-h
> 
> [1] There are at least 2 other programs like udev used by distros these
> days, udev is not the only player in this area anymore.


-- 
~Randy
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