linux-kernel - Re: [PATCH 06/12] arch: Declare screen_info in <asm/screen

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Message-Id: <b31f42c1-4283-4793-b448-f7b9326be5d4@app.fastmail.com>
Date:   Thu, 29 Jun 2023 15:03:20 +0200
From:   "Arnd Bergmann" <arnd@...db.de>
To:     "Thomas Zimmermann" <tzimmermann@...e.de>,
        "Helge Deller" <deller@....de>, "Daniel Vetter" <daniel@...ll.ch>,
        "Dave Airlie" <airlied@...il.com>
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Subject: Re: [PATCH 06/12] arch: Declare screen_info in <asm/screen_info.h>

On Thu, Jun 29, 2023, at 13:45, Thomas Zimmermann wrote:

> diff --git a/include/asm-generic/screen_info.h 
> b/include/asm-generic/screen_info.h
> new file mode 100644
> index 0000000000000..6fd0e50fabfcd
> --- /dev/null
> +++ b/include/asm-generic/screen_info.h
> @@ -0,0 +1,12 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +
> +#ifndef _ASM_GENERIC_SCREEN_INFO_H
> +#define _ASM_GENERIC_SCREEN_INFO_H
> +
> +#include <uapi/linux/screen_info.h>
> +
> +#if defined(CONFIG_ARCH_HAS_SCREEN_INFO)
> +extern struct screen_info screen_info;
> +#endif
> +
> +#endif /* _ASM_GENERIC_SCREEN_INFO_H */
> diff --git a/include/linux/screen_info.h b/include/linux/screen_info.h
> index eab7081392d50..c764b9a51c24b 100644
> --- a/include/linux/screen_info.h
> +++ b/include/linux/screen_info.h
> @@ -4,6 +4,6 @@
> 
>  #include <uapi/linux/screen_info.h>
> 
> -extern struct screen_info screen_info;
> +#include <asm/screen_info.h>
> 

What is the purpose of adding a file in asm-generic? If all
architectures use the same generic file, I'd just leave the
declaration in include/linux/. I wouldn't bother adding the
#ifdef either, but I can see how that helps turn a link
error into an earlier compile error.

      Arnd