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

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Message-ID: <8e47f91e-709b-453f-55e5-a7abd2dfe1dd@suse.de>
Date:   Mon, 17 Apr 2023 16:07:10 +0200
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.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,
        Rich Felker <dalias@...c.org>, linux-ia64@...r.kernel.org,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        linux-parisc@...r.kernel.org, linux-sh@...r.kernel.org,
        x86@...nel.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-mips@...r.kernel.org,
        linux-m68k@...ts.linux-m68k.org, loongarch@...ts.linux.dev,
        sparclinux@...r.kernel.org, linux-snps-arc@...ts.infradead.org,
        linuxppc-dev@...ts.ozlabs.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 16/19] arch/sh: Implement <asm/fb.h> with generic
 helpers



Am 17.04.23 um 16:06 schrieb Thomas Zimmermann:
> Hi
> 
> Am 17.04.23 um 15:02 schrieb 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@...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?
> 
> Patch 01 of this patchset changes the generic fb_pgprotect() to set 
> pgprot_writecombine(). So on SH, there should be no change at all.

In case you didn't receive that patch:

   https://patchwork.freedesktop.org/patch/532493/?series=116157&rev=3

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

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev

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