Re: [PATCH v3 16/19] arch/sh: Implement <asm/fb.h> with generic helpers

[John Paul Adrian Glaubitz]

Hi Thomas!

On Mon, 2023-04-17 at 14:56 +0200, Thomas Zimmermann wrote:
> Replace the architecture's fbdev helpers with the generic
> ones from <asm-generic/fb.h>. No functional changes.
> 
> v2:
> 	* use default implementation for fb_pgprotect() (Arnd)
> 
> Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
> Cc: Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx>
> Cc: Rich Felker <dalias@xxxxxxxx>
> Cc: John Paul Adrian Glaubitz <glaubitz@xxxxxxxxxxxxxxxxxxx>
> ---
>  arch/sh/include/asm/fb.h | 15 +--------------
>  1 file changed, 1 insertion(+), 14 deletions(-)
> 
> diff --git a/arch/sh/include/asm/fb.h b/arch/sh/include/asm/fb.h
> index 9a0bca2686fd..19df13ee9ca7 100644
> --- a/arch/sh/include/asm/fb.h
> +++ b/arch/sh/include/asm/fb.h
> @@ -2,19 +2,6 @@
>  #ifndef _ASM_FB_H_
>  #define _ASM_FB_H_
>  
> -#include <linux/fb.h>
> -#include <linux/fs.h>
> -#include <asm/page.h>
> -
> -static inline void fb_pgprotect(struct file *file, struct vm_area_struct *vma,
> -				unsigned long off)
> -{
> -	vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
> -}

Looking at the macro in asm-generic/fb.h, fb_pgprotect() is being replaced with
a no-op function. Is that intentional? Can you briefly explain the background
for this change?

> -static inline int fb_is_primary_device(struct fb_info *info)
> -{
> -	return 0;
> -}
> +#include <asm-generic/fb.h>
>  
>  #endif /* _ASM_FB_H_ */

Thanks,
Adrian

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