linux-kernel - Re: [PATCH v2 4/5] fbdev: Include <linux/io.h> in drivers

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Date:   Fri, 28 Apr 2023 15:13:14 +0200
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     Sam Ravnborg <sam@...nborg.org>
Cc:     deller@....de, geert@...ux-m68k.org, javierm@...hat.com,
        daniel@...ll.ch, vgupta@...nel.org, chenhuacai@...nel.org,
        kernel@...0n.name, davem@...emloft.net,
        James.Bottomley@...senpartnership.com, arnd@...db.de,
        linux-fbdev@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-arch@...r.kernel.org, linux-snps-arc@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-ia64@...r.kernel.org,
        loongarch@...ts.linux.dev, linux-m68k@...ts.linux-m68k.org,
        sparclinux@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-parisc@...r.kernel.org
Subject: Re: [PATCH v2 4/5] fbdev: Include <linux/io.h> in drivers

Hi Sam

Am 28.04.23 um 15:07 schrieb Sam Ravnborg:
> On Fri, Apr 28, 2023 at 11:27:10AM +0200, Thomas Zimmermann wrote:
>> Fbdev's main header file, <linux/fb.h>, includes <asm/io.h> to get
>> declarations of I/O helper functions. From these declaratons, it later
>> defines framebuffer I/O helpers, such as fb_{read,write}[bwlq]() or
>> fb_memset().
>>
>> The framebuffer I/O helpers pre-date Linux' current I/O code and will
>> be replaced by regular I/O helpers. Prepare this change by adding an
>> include statement for <linux/io.h> to all source files that use the
>> framebuffer I/O helpers. They will still get declarations of the I/O
>> functions even after <linux/fb.h> has been cleaned up.
> When fb.h uses a symbol from io.h, then it shall include that
> file so it is self contained.
> So it is wrong to push the io.h include to the users of
> fb_{read,write,xxx}. Maybe fb.h only uses macros as is the case here,
> but that is no excuse nt to include io.h.
> 
> Drop these changes.

No problem. That was done with an eye on removing the fb_() macros 
entirely. But the discussion around patch 5 now goes in a different 
direction anyway.

Best regards
Thomas

> 
>> Driver source
>> files that already include <asm/io.h> convert to <linux/io.h>.
> This is a nice cleanup - we should keep that.
> 
> 	Sam

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)

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