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From: Bjorn Helgaas <bhelgaas@google.com>
Date: Wed, 14 Nov 2012 07:53:31 -0700
Message-ID: <CAErSpo6p09BJo=3tFp7f8StLT9avYdqiecGm8FxyQnWUm+pfiw@mail.gmail.com>
Subject: Re: [PATCH] Centralise CONFIG_ARCH_NO_VIRT_TO_BUS
To: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>,
        Andrew Morton <akpm@linux-foundation.org>,
        H Hartley Sweeten <hartleys@visionengravers.com>,
        linux-kernel@vger.kernel.org,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Paul Mackerras <paulus@samba.org>, linuxppc-dev@lists.ozlabs.org,
        "David S. Miller" <davem@davemloft.net>, sparclinux@vger.kernel.org,
        linux-arch@vger.kernel.org, Paul Mundt <lethal@linux-sh.org>,
        linux-sh@vger.kernel.org
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On Tue, Nov 13, 2012 at 3:32 AM, Geert Uytterhoeven
<geert@linux-m68k.org> wrote:
> On Mon, Nov 12, 2012 at 10:26 PM, Stephen Rothwell <sfr@canb.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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