linux-kernel - Re: [V5 PATCH 1/2] ACPI / scan: Add support for ACPI

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Message-ID: <20150325151139.GA1878@lahna.fi.intel.com>
Date:	Wed, 25 Mar 2015 17:11:39 +0200
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>, lv.zheng@...el.com,
	hpa@...ux.intel.com, lenb@...nel.org, hdegoede@...hat.com,
	tj@...nel.org, arnd@...db.de, mjg59@...f.ucam.org,
	gregkh@...uxfoundation.org, hanjun.guo@...aro.org,
	al.stone@...aro.org, graeme.gregory@...aro.org, leo.duran@....com,
	linux-ide@...r.kernel.org, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org, linaro-acpi@...ts.linaro.org
Subject: Re: [V5 PATCH 1/2] ACPI / scan: Add support for ACPI _CLS device
 matching

On Wed, Mar 25, 2015 at 10:09:42AM -0500, Suravee Suthikulpanit wrote:
> On 3/24/15 15:20, Rafael J. Wysocki wrote:
> >On Tuesday, March 24, 2015 04:43:46 PM Mika Westerberg wrote:
> >>On Tue, Mar 24, 2015 at 09:23:47AM -0500, Suravee Suthikulpanit wrote:
> >>>On 3/9/15 10:20, Mika Westerberg wrote:
> >>>>>[....]
> >>>>>diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h
> >>>>>index e530533..9a42522 100644
> >>>>>--- a/include/linux/mod_devicetable.h
> >>>>>+++ b/include/linux/mod_devicetable.h
> >>>>>@@ -189,6 +189,7 @@ struct css_device_id {
> >>>>>  struct acpi_device_id {
> >>>>>  	__u8 id[ACPI_ID_LEN];
> >>>>>  	kernel_ulong_t driver_data;
> >>>>>+	__u32 cls;
> >>>>
> >>>>It would be nice if we could change ordering here but I understand that
> >>>>it breaks quite many drivers. Perhaps we should consider creating
> >>>>ACPI_DEVICE() macro and convert existing drivers to that at some point.
> >>>
> >>>Yes, a roughly grep in the drivers directory showing about 112 files at the
> >>>moment. If you think this is the right approach going forward, we can work
> >>>on cleaning this up on a separate patch series. Please let me know what you
> >>>think.
> >>
> >>I think having ACPI_DEVICE() macro would be pretty useful and it avoids
> >>things like this if we need to add new fields in the future. Rafael has
> >>the last word, though :-)
> >
> >I agree.
> 
> Okay, how should I organize this big change? Can we do this as a separate
> patch series?

Separate patch series is fine.
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