linux-kernel - Re: [PATCH 1/2] mips: provide unxlate_dev_mem

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Date:   Wed, 21 Jun 2023 16:05:11 +0200
From:   "Arnd Bergmann" <arnd@...db.de>
To:     "Guenter Roeck" <linux@...ck-us.net>,
        "Arnd Bergmann" <arnd@...nel.org>
Cc:     "Thomas Bogendoerfer" <tsbogend@...ha.franken.de>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        "Geert Uytterhoeven" <geert@...ux-m68k.org>,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] mips: provide unxlate_dev_mem_ptr() in asm/io.h

On Wed, Jun 21, 2023, at 15:52, Guenter Roeck wrote:
> On Tue, May 16, 2023 at 09:39:42PM +0200, Arnd Bergmann wrote:
>> From: Arnd Bergmann <arnd@...db.de>
>> 
>> The unxlate_dev_mem_ptr() function has no prototype on the mips
>> architecture, which does not include asm-generic/io.h, so gcc warns
>> about the __weak definition:
>> 
>> drivers/char/mem.c:94:29: error: no previous prototype for 'unxlate_dev_mem_ptr' [-Werror=missing-prototypes]
>> 
>> Since everyone else already gets the generic definition or has a custom
>> one, there is not really much point in having a __weak version as well.
>> 
>> Remove this one, and instead add a trivial macro to the mips header.
>> Once we convert mips to use the asm-generic header, this can go away
>> again.
>> 
>
> This results in build failures when trying to build sh4 images.
>
> drivers/char/mem.c: In function 'read_mem':
> drivers/char/mem.c:164:25: error: implicit declaration of function 
> 'unxlate_dev_mem_ptr'

Odd, it looks like arch/sh/ is also missing an #include
<asm-generic/io.h> in its asm/io.h, I was sure that mips was the
only one to still not have that.

There are already patches on the list to convert both, so I think
we'll be fine on sh after this one gets merged:
https://lore.kernel.org/all/20230609075528.9390-12-bhe@redhat.com/

    Arnd