Re: [PATCH v2 4/5] fbdev: Include in drivers

Sam Ravnborg
2023-04-28T13:07:15Z

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