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Sender: Guenter Roeck <groeck7@gmail.com>
Date:   Wed, 21 Jun 2023 06:52:38 -0700
From:   Guenter Roeck <linux@roeck-us.net>
To:     Arnd Bergmann <arnd@kernel.org>
Cc:     Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
        Arnd Bergmann <arnd@arndb.de>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Geert Uytterhoeven <geert@linux-m68k.org>,
        linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/2] mips: provide unxlate_dev_mem_ptr() in asm/io.h
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References: <20230516194000.548487-1-arnd@kernel.org>
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On Tue, May 16, 2023 at 09:39:42PM +0200, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.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'

Guenter