linux-kernel - Re: [PATCH V7 08/11] ACPI: always register memory hotplug scan handler even if CONFIG_X86_INTEL

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Message-ID: <2390763.sjfZLLMhWb@vostro.rjw.lan>
Date:	Mon, 26 May 2014 14:40:58 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:	Zhang Rui <rui.zhang@...el.com>, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org, bhelgaas@...gle.com,
	matthew.garrett@...ula.com, rafael.j.wysocki@...el.com,
	dmitry.torokhov@...il.com
Subject: Re: [PATCH V7 08/11] ACPI: always register memory hotplug scan handler even if CONFIG_X86_INTEL_LPSS is cleared

On Monday, May 26, 2014 02:52:35 PM Mika Westerberg wrote:
> On Mon, May 26, 2014 at 01:53:39PM +0200, Rafael J. Wysocki wrote:
> > > I'm wondering whether it is worth the ugliness to get platform bus
> > > enumeration the default?
> > > 
> > > Since you already have the PNP whitelist, can't we just use that for PNP
> > > and keep these files as they are? In other words, don't make any kind of
> > > physical device by default and let the scan handlers to decide.
> > 
> > Well, that's tempting, but then we'd get one more whitelist pretty much without
> > any benefit, because we'd be still going to have the list in acpi_platform.c.
> > 
> > The purpose of the whole exercise is not to prevent PNP devices from being
> > created by default (which admittedly is a nice side effect), but to get rid
> > of the white list in acpi_platform.c - and in particular, to avoid the
> > necessity to add every ACPI-enumerated platform device to that list in the
> > future.
> 
> Yes, I understand but that list currently has only 5 entries. Are
> we expecting to have much more entries there in the future?

Yes, we are.  Pretty much anything that's DT-enumerable today may be
ACPI-enumerable in the future.  But you should know that. ;-)

> For LPSS devices we can't get rid of the list since we need to pass
> ->driver_data based on the _HID anyway.

Obviously.

Rafael

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