linux-kernel - Re: [PATCH 7/7] driver-core : convert semaphore to mutex in struct class

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Message-ID: <20080118114001.GA2610@ff.dom.local>
Date:	Fri, 18 Jan 2008 12:40:01 +0100
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Kay Sievers <kay.sievers@...y.org>
Cc:	Dave Young <hidave.darkstar@...il.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Greg KH <gregkh@...e.de>, stefanr@...6.in-berlin.de,
	David Brownell <david-b@...bell.net>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 7/7] driver-core : convert semaphore to mutex in struct
	class

On Fri, Jan 18, 2008 at 11:45:12AM +0100, Kay Sievers wrote:
> On Fri, 2008-01-18 at 08:38 +0100, Jarek Poplawski wrote:
> > On Fri, Jan 18, 2008 at 01:31:17PM +0800, Dave Young wrote:
> > > On Jan 18, 2008 11:18 AM, Kay Sievers <kay.sievers@...y.org> wrote:
> > ...
> > > > Yeah, might be better to wait until class_device is gone, otherwise you
> > > > may need to fix stuff that is just going to be removed. Your change to
> > > > have iterators for the class devices look like a nice preparation for
> > > > future changes though.
> > > >
> > > > Our rough plan is:
> > > >  2.6.25:
> > > >   - get the ~100 patches in Greg's tree (in -mm) merged :)
> > > >  2.6.26:
> > > > ???  - remove the 20 char limit in "struct device"
> > > >   - get rid of "struct class_device"
> > > 
> > > Fine, thanks.
> > > 
> > > Let's wait for other people's comment.
> > 
> > Dave, I doubt you'll ever manage to do this if you're going to wait:
> > probably there will be always some new changes like this around...
> 
> Well there are not "changes" in that sense, the class_device stuff will
> be entirely ripped out, and I doubt we will want to change anything
> there, just shortly before it's deleted.

So, 2.6.26 means shortly... And this all needs some time for testing,
debugging or maybe some change of concept, so this would take a while...
Well, it's not my problem, but since this stuff will go away, shouldn't
we care more about the staff that will stay?

> Also your assumptions about device nesting are not really true, there is
> no limit, even when there are no current users nesting deeper, and
> "struct device" can be any nesting depth, and that's where it gets
> interesting.

I'm just trying to figure this out. It seems this is a real problem
while freezing, but not necessarily here (but I can miss something).
 
Regards,
Jarek P.
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