linux-kernel - Re: [PATCH v2 02/19] arch/arc: Implement <asm/fb.h> with generic helpers

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Message-Id: <27c1210f-4e40-4bbc-905b-155427465e00@app.fastmail.com>
Date:   Thu, 06 Apr 2023 16:43:56 +0200
From:   "Arnd Bergmann" <arnd@...db.de>
To:     "Thomas Zimmermann" <tzimmermann@...e.de>,
        "Daniel Vetter" <daniel.vetter@...ll.ch>,
        "Helge Deller" <deller@....de>,
        "Javier Martinez Canillas" <javierm@...hat.com>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>
Cc:     Linux-Arch <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,
        "Vineet Gupta" <vgupta@...nel.org>
Subject: Re: [PATCH v2 02/19] arch/arc: Implement <asm/fb.h> with generic helpers

On Thu, Apr 6, 2023, at 16:30, Thomas Zimmermann wrote:
> +
>  static inline void fb_pgprotect(struct file *file, struct vm_area_struct *vma,
>  				unsigned long off)
>  {
>  	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
>  }
> +#define fb_pgprotect fb_pgprotect

I still feel that for architectures like arc that don't have
pgprot_writecombine(), it would b best to go with the
generic implementation that currently behaves the exact
same way. If pgprot_writecombine() gets added in the future,
it would cause the architecture to behave as expected rather
than introducing the same bug that mips has.

      Arnd