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

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Message-ID: <20230623131620.GG11636@alpha.franken.de>
Date:   Fri, 23 Jun 2023 15:16:20 +0200
From:   Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Guenter Roeck <linux@...ck-us.net>,
        Arnd Bergmann <arnd@...nel.org>,
        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 04:05:11PM +0200, Arnd Bergmann wrote:
> 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/

which is already taken ages, so I'm not that confident, that this
will happen before merge window starts...

Thomas.

-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea.                                                [ RFC1925, 2.3 ]