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

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Message-ID: <3c188e948506dc97112dcc070cf16e36209c6cc5.camel@physik.fu-berlin.de>
Date:   Mon, 17 Apr 2023 15:02:11 +0200
From:   John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
To:     Thomas Zimmermann <tzimmermann@...e.de>, arnd@...db.de,
        daniel.vetter@...ll.ch, deller@....de, javierm@...hat.com,
        gregkh@...uxfoundation.org
Cc:     linux-arch@...r.kernel.org, linux-fbdev@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        linux-snps-arc@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-ia64@...r.kernel.org,
        loongarch@...ts.linux.dev, linux-m68k@...ts.linux-m68k.org,
        linux-mips@...r.kernel.org, linux-parisc@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-sh@...r.kernel.org,
        sparclinux@...r.kernel.org, x86@...nel.org,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>
Subject: Re: [PATCH v3 16/19] arch/sh: Implement <asm/fb.h> with generic
 helpers

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@...e.de>
> Cc: Yoshinori Sato <ysato@...rs.sourceforge.jp>
> Cc: Rich Felker <dalias@...c.org>
> Cc: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
> ---
>  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

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer
`. `'   Physicist
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