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SubjectRe: [RFC 02/32] Kconfig: introduce HAS_IOPORT option and select it as necessary
Hi Arnd,

Am 29.12.2021 um 16:41 schrieb Arnd Bergmann:
> On Tue, Dec 28, 2021 at 8:20 PM Michael Schmitz <> wrote:
>> Am 28.12.2021 um 23:08 schrieb Geert Uytterhoeven:
>>> On Mon, Dec 27, 2021 at 5:44 PM Niklas Schnelle <> wrote:
>>>> We introduce a new HAS_IOPORT Kconfig option to gate support for
>>>> I/O port access. In a future patch HAS_IOPORT=n will disable compilation
>>>> of the I/O accessor functions inb()/outb() and friends on architectures
>>>> which can not meaningfully support legacy I/O spaces. On these platforms
>>>> inb()/outb() etc are currently just stubs in asm-generic/io.h which when
>>>> called will cause a NULL pointer access which some compilers actually
>>>> detect and warn about.
>>>> The dependencies on HAS_IOPORT in drivers as well as ifdefs for
>>>> HAS_IOPORT specific sections will be added in subsequent patches on
>>>> a per subsystem basis. Then a final patch will ifdef the I/O access
>>>> functions on HAS_IOPORT thus turning any use not gated by HAS_IOPORT
>>>> into a compile-time warning.
>>>> Link:
>>>> Co-developed-by: Arnd Bergmann <>
>>>> Signed-off-by: Arnd Bergmann <>
>>>> Signed-off-by: Niklas Schnelle <>
>>> Thanks for your patch!
>>>> --- a/arch/m68k/Kconfig
>>>> +++ b/arch/m68k/Kconfig
>>>> @@ -16,6 +16,7 @@ config M68K
>>>> select GENERIC_IOMAP
>>>> select GENERIC_IRQ_SHOW
>>>> + select HAS_IOPORT
>>>> select HAVE_AOUT if MMU
>>> This looks way too broad to me: most m68k platform do not have I/O
>>> port access support.
>>> My gut feeling says:
>>> select HAS_IOPORT if PCI || ISA
>>> but that might miss some intricate details...
>> In particular, this misses the Atari ROM port ISA adapter case -
>> might do instead.
> Right, makes sense. I had suggested to go the easy way and assume that
> each architecture would select HAS_IOPORT if any configuration supports
> it, but it looks like for m68k there is a clearly defined set of platforms that
> do.
> Note that for the platforms that don't set any of the three symbols, the
> fallback makes inb() an alias for readb() with a different argument type,
> so there may be m68k specific drivers that rely on this, but those would
> already be broken if ATARI_ROM_ISA is set.

I'd hope not - we spent some effort to make sure setting ATARI_ROM_ISA
does not affect other m68k platforms when e.g. building multiplatform

Replacing inb() by readb() without any address translation won't do much
good for m68k though - addresses in the traditional ISA I/O port range
would hit the (unmapped) zero page.



> Arnd

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