linux-kernel - Re: [Linaro-acpi] [V2 PATCH 1/5] ACPI / scan: Parse

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Message-ID: <4260574.bvpyYkBNGq@vostro.rjw.lan>
Date:	Thu, 07 May 2015 22:18:44 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linaro-acpi@...ts.linaro.org,
	Suravee Suthikulanit <suravee.suthikulpanit@....com>,
	herbert@...dor.apana.org.au, catalin.marinas@....com,
	will.deacon@....com, linux-kernel@...r.kernel.org,
	linux-crypto@...r.kernel.org, linux-acpi@...r.kernel.org,
	netdev@...r.kernel.org,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	davem@...emloft.net, linux-arm-kernel@...ts.infradead.org,
	lenb@...nel.org
Subject: Re: [Linaro-acpi] [V2 PATCH 1/5] ACPI / scan: Parse _CCA and setup device coherency

On Thursday, May 07, 2015 11:07:08 AM Arnd Bergmann wrote:
> On Wednesday 06 May 2015 17:16:35 Suravee Suthikulanit wrote:
> > On 5/6/2015 5:21 PM, Rafael J. Wysocki wrote:
> > >>>> > >>+      bool
> > >>>> > >>+
> > >>>> > >>+config ACPI_SUPPORT_CCA_ZERO
> > >>> > >
> > >>> > >I guess this means "we support devices that can DMA, but are not coherent".
> > >>> > >right?
> > >> >
> > >> >Yes, basically when _CCA=0.
> > > So what about
> > >
> > >       ARCH_SUPPORT_CACHE_INCOHERENT_DMA
> > 
> > Since this is specific to ACPI _CCA, I just want to be clear with the 
> > naming.
> 
> How about directly using the architecture names here, this is inherently
> architecture specific, and it's more likely that if another architecture
> gets added in the future that it will have other requirements.

Sounds reasonable to me.

Rafael

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