linux-kernel - Re: [PATCH] Centralise CONFIG_ARCH_NO_VIRT_TO

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Message-ID: <CAErSpo6p09BJo=3tFp7f8StLT9avYdqiecGm8FxyQnWUm+pfiw@mail.gmail.com>
Date:	Wed, 14 Nov 2012 07:53:31 -0700
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	Andrew Morton <akpm@...ux-foundation.org>,
	H Hartley Sweeten <hartleys@...ionengravers.com>,
	linux-kernel@...r.kernel.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	linuxppc-dev@...ts.ozlabs.org,
	"David S. Miller" <davem@...emloft.net>,
	sparclinux@...r.kernel.org, linux-arch@...r.kernel.org,
	Paul Mundt <lethal@...ux-sh.org>, linux-sh@...r.kernel.org
Subject: Re: [PATCH] Centralise CONFIG_ARCH_NO_VIRT_TO_BUS

On Tue, Nov 13, 2012 at 3:32 AM, Geert Uytterhoeven
<geert@...ux-m68k.org> wrote:
> On Mon, Nov 12, 2012 at 10:26 PM, Stephen Rothwell <sfr@...b.auug.org.au> wrote:
>> diff --git a/arch/Kconfig b/arch/Kconfig
>> index 366ec06..9bc00e7 100644
>> --- a/arch/Kconfig
>> +++ b/arch/Kconfig
>> @@ -271,6 +271,13 @@ config ARCH_WANT_OLD_COMPAT_IPC
>>         select ARCH_WANT_COMPAT_IPC_PARSE_VERSION
>>         bool
>>
>> +config ARCH_NO_VIRT_TO_BUS
>> +       bool
>> +       help
>> +         An architecture should select this if it cannot (or will not)
>> +         implement virt_to_bus().  All new architectures should probably
>> +         select this.
>
> Don't we typically put the burden of selecting Kconfig flags for deprecated
> features on the existing architectures that provide the deprecated features?
>
> I.e. shouldn't it be ARCH_HAS_VIRT_TO_BUS, selected by the architectures
> that need it, instead?

I like this idea.
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