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

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Date:   Fri, 28 Apr 2023 15:07:02 +0200
From:   Sam Ravnborg <sam@...nborg.org>
To:     Thomas Zimmermann <tzimmermann@...e.de>
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

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.

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

	Sam