linux-kernel - Re: [PATCH v5 18/18] Documentation: ACPI for ARM64

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Message-ID: <20150106141630.GG8829@e104818-lin.cambridge.arm.com>
Date:	Tue, 6 Jan 2015 14:16:30 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"hanjun.guo@...aro.org" <hanjun.guo@...aro.org>,
	Mark Rutland <Mark.Rutland@....com>,
	"linaro-acpi@...ts.linaro.org" <linaro-acpi@...ts.linaro.org>,
	Will Deacon <Will.Deacon@....com>,
	Lv Zheng <lv.zheng@...el.com>, Rob Herring <robh@...nel.org>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Al Stone <al.stone@...aro.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Robert Moore <robert.moore@...el.com>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"jcm@...hat.com" <jcm@...hat.com>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	Charles Garcia-Tobin <Charles.Garcia-Tobin@....com>,
	Robert Richter <rric@...nel.org>,
	Jason Cooper <jason@...edaemon.net>,
	Marc Zyngier <Marc.Zyngier@....com>,
	Liviu Dudau <Liviu.Dudau@....com>,
	Mark Brown <broonie@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"graeme.gregory@...aro.org" <graeme.gregory@...aro.org>,
	"Kangkang.Shen@...wei.com" <Kangkang.Shen@...wei.com>,
	Randy Dunlap <rdunlap@...radead.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Sudeep Holla <Sudeep.Holla@....com>,
	Olof Johansson <olof@...om.net>
Subject: Re: [PATCH v5 18/18] Documentation: ACPI for ARM64

On Tue, Jan 06, 2015 at 02:05:12PM +0000, Arnd Bergmann wrote:
> On Tuesday 06 January 2015 11:29:29 Catalin Marinas wrote:
> > > >> We will work on this both on ASWG and linux ACPI driver side, as Dong
> > > >> and Charles pointed out, _OSI things can be solved in ACPI spec, when
> > > >> that is done, we can modify the kernel driver to fix the problems above.
> > > >
> > > > Which driver?
> > > 
> > > the ACPICA core driver as you suggested, sorry for the confusion.
> > > 
> > > > What about ACPI_OS_NAME? Would you suggest it is fine to report
> > > > "Microsoft Windows NT" on an ARM system? That _OS_ not _OSI.
> > > 
> > > No, not at all. I prefer "Linux"
> > > In include/acpi/acconfig.h, when ACPI_OS_NAME defined, it says:
> > > "OS name, used for the _OS object.  The _OS object is essentially
> > > obsolete,..."
> > > for some legacy reasons, we needed  "Microsoft Windows NT", but ACPI
> > > for ARM64 on linux is totally new, I think we can change it to
> > > "Linux" when CONFIG_ARM64 as you suggested.
> > 
> > We could ignore this change for now if we don't expect the _OS object to
> > be used at all. But do we have any other way to check the AML code for
> > this? Would FWTS catch such obsolete cases?
> 
> How about just leaving it out? It's clearly not used for anything
> good, so I don't see the point in passing either Linux or "Microsoft
> Windows NT" here.

Do you mean defining it to NULL (so it ends up as NULL in
acpi_gbl_pre_defined_names) or removing "_OS_" entirely from that array?
I really can't tell what the implications are.

-- 
Catalin
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