linux-kernel - Re: [RFC PATCH 02/11] drivers/base: Add hotplug framework code

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Date:	Thu, 13 Dec 2012 18:59:16 -0700
From:	Toshi Kani <toshi.kani@...com>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	"rjw@...k.pl" <rjw@...k.pl>, "lenb@...nel.org" <lenb@...nel.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"bhelgaas@...gle.com" <bhelgaas@...gle.com>,
	"isimatu.yasuaki@...fujitsu.com" <isimatu.yasuaki@...fujitsu.com>,
	"jiang.liu@...wei.com" <jiang.liu@...wei.com>,
	"wency@...fujitsu.com" <wency@...fujitsu.com>,
	"guohanjun@...wei.com" <guohanjun@...wei.com>,
	"yinghai@...nel.org" <yinghai@...nel.org>,
	"srivatsa.bhat@...ux.vnet.ibm.com" <srivatsa.bhat@...ux.vnet.ibm.com>
Subject: Re: [RFC PATCH 02/11] drivers/base: Add hotplug framework code

On Thu, 2012-12-13 at 10:24 -0800, Greg KH wrote:
> On Thu, Dec 13, 2012 at 09:30:51AM -0700, Toshi Kani wrote:
> > On Thu, 2012-12-13 at 04:24 +0000, Greg KH wrote:
> > > On Wed, Dec 12, 2012 at 09:02:45PM -0700, Toshi Kani wrote:
> > > > On Wed, 2012-12-12 at 15:54 -0800, Greg KH wrote:
> > > > > On Wed, Dec 12, 2012 at 04:17:14PM -0700, Toshi Kani wrote:
> > > > > > Added hotplug.c, which is the hotplug framework code.
> > > > > 
> > > > > Again, better naming please.
> > > > 
> > > > Yes, I will change it to be more specific, something like
> > > > "sys_hotplug.c".
> > > 
> > > Ugh, what's wrong with just a simple "system_bus.c" or something like
> > > that, and then put all of the needed system bus logic in there and tie
> > > the cpus and other sysdev code into that?
> > 
> > The issue is that the framework does not provide the system bus
> > structure.  This is because the system bus structure is not used for CPU
> > and memory initialization at boot (as I explained in my other email).
> 
> I understand, please fix that and then you will not have these issues :)
> 
> > The framework manages the calling sequence of hotplug operations, which
> > is similar to the boot sequence managed by start_kernel(),
> > kernel_init(), do_initcalls(), etc.  In such sense, this file might not
> > be a good fit for drivers/base, but I could not find a better place for
> > it.
> 
> Having "similar but slightly different" isn't a good way to do things,
> and I think you are trying to solve that problem here, so converting
> everything to use the driver model properly will solve these issues for
> you, right?
> 
> I _really_ don't want to see yet-another-way-to-do-things be created at
> all, unless it really really really is special and different for some
> reason.  So far, I have yet to be convinced, especially given that your
> reasoning for doing this seems to be "to do it correctly would be too
> much work so I created another interface".  That isn't going to fly,
> sorry.

Let's continue to discuss on other thread since I copied s390 and ppc
folks on that one.

Thanks,
-Toshi

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