linux-kernel - Re: [PATCH 4/4] sh: machvec: remove custom ioport

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Date:   Wed, 13 Sep 2023 16:08:23 +0200
From:   "Arnd Bergmann" <arnd@...db.de>
To:     "Geert Uytterhoeven" <geert@...ux-m68k.org>,
        "Arnd Bergmann" <arnd@...nel.org>
Cc:     "John Paul Adrian Glaubitz" <glaubitz@...sik.fu-berlin.de>,
        linux-sh@...r.kernel.org, "Rich Felker" <dalias@...c.org>,
        "Yoshinori Sato" <ysato@...rs.sourceforge.jp>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] sh: machvec: remove custom ioport_{un,}map()

On Wed, Sep 13, 2023, at 14:32, Geert Uytterhoeven wrote:
> On Wed, Aug 2, 2023 at 8:49 PM Arnd Bergmann <arnd@...nel.org> wrote:
>> From: Arnd Bergmann <arnd@...db.de>
>>
>> These functions were only used on the microdev
>> board that is now gone, so remove them to simplify
>> the ioport handling.
>>
>> This could be further simplified to use the generic
>> I/O port accessors now.
>>
>> Signed-off-by: Arnd Bergmann <arnd@...db.de>
>
>> --- a/arch/sh/include/asm/io.h
>> +++ b/arch/sh/include/asm/io.h
>> @@ -181,7 +181,7 @@ static inline void pfx##out##bwlq##p(type val, unsigned long port)  \
>>  {                                                                      \
>>         volatile type *__addr;                                          \
>>                                                                         \
>> -       __addr = __ioport_map(port, sizeof(type));                      \
>> +       __addr = (void __iomem *)sh_io_port_base + port;                \
>
> Note that this adds unconditional users of sh_io_port_base, while
> sh_io_port_base is provided by arch/sh/kernel/ioport.c, which is
> currently only built if CONFIG_GENERIC_IOMAP=n.
>
> This is not a problem yet, as the final part to enable GENERIC_IOMAP
> on SH never made it upstream.  However, Sato-san's series enables
> GENERIC_IOMAP for SH_DEVICE_TREE=y builds, leading to a link failure.

Do you have a link to that series? I don't understand why you'd
want to enable GENERIC_IOMAP on sh, given that its PIO accesses
are always memory mapped in the end.

Is this needed for the trapped_io CF stuff?

       Arnd