[PATCH] Centralise CONFIG_ARCH_NO_VIRT_TO_BUS

[Bjorn Helgaas]

On Tue, Nov 13, 2012 at 3:32 AM, Geert Uytterhoeven
<geert at linux-m68k.org> wrote:
> On Mon, Nov 12, 2012 at 10:26 PM, Stephen Rothwell <sfr at 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.