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

From: Thomas Zimmermann <tzimmermann@suse.de>
To: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>,
	arnd@arndb.de, daniel.vetter@ffwll.ch, deller@gmx.de,
	javierm@redhat.com, gregkh@linuxfoundation.org
Cc: linux-arch@vger.kernel.org, linux-fbdev@vger.kernel.org,
	Rich Felker <dalias@libc.org>,
	linux-ia64@vger.kernel.org,
	Yoshinori Sato <ysato@users.sourceforge.jp>,
	linux-parisc@vger.kernel.org, linux-sh@vger.kernel.org,
	x86@kernel.org, linux-kernel@vger.kernel.org,
	dri-devel@lists.freedesktop.org, linux-mips@vger.kernel.org,
	linux-m68k@lists.linux-m68k.org, loongarch@lists.linux.dev,
	sparclinux@vger.kernel.org, linux-snps-arc@lists.infradead.org,
	linuxppc-dev@lists.ozlabs.org,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v3 16/19] arch/sh: Implement <asm/fb.h> with generic helpers
Date: Mon, 17 Apr 2023 16:07:10 +0200	[thread overview]
Message-ID: <8e47f91e-709b-453f-55e5-a7abd2dfe1dd@suse.de> (raw)
In-Reply-To: <132f1185-d61f-b8c7-8d6e-4e4280a1a4ad@suse.de>

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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@suse.de>
>>> Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
>>> Cc: Rich Felker <dalias@libc.org>
>>> Cc: John Paul Adrian Glaubitz <glaubitz@physik.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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