Hi Niklas,
On Mon, Dec 27, 2021 at 5:44 PM Niklas Schnelle <[email protected]> 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:
> https://lore.kernel.org/lkml/CAHk-=wg80je=k7madf4e7wrrnp37e3qh6y10svhdc7o8sz_...@mail.gmail.com/
> Co-developed-by: Arnd Bergmann <[email protected]>
> Signed-off-by: Arnd Bergmann <[email protected]>
> Signed-off-by: Niklas Schnelle <[email protected]>
Thanks for your patch!
> --- a/arch/m68k/Kconfig
> +++ b/arch/m68k/Kconfig
> @@ -16,6 +16,7 @@ config M68K
> select GENERIC_CPU_DEVICES
> select GENERIC_IOMAP
> select GENERIC_IRQ_SHOW
> + select HAS_IOPORT
> select HAVE_AOUT if MMU
> select HAVE_ASM_MODVERSIONS
> select HAVE_DEBUG_BUGVERBOSE
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...
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- [email protected]
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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