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

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Date:	Thu, 13 Dec 2012 10:24:22 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Toshi Kani <toshi.kani@...com>
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, 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.

thanks,

greg k-h
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