linux-kernel - Re: [PATCH v3 5/6] fbdev: Move framebuffer I/O helpers into <asm/fb.h>

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Date:   Wed, 3 May 2023 21:03:17 +0200
From:   Sam Ravnborg <sam@...nborg.org>
To:     Thomas Zimmermann <tzimmermann@...e.de>
Cc:     linux-arch@...r.kernel.org, linux-fbdev@...r.kernel.org,
        linux-ia64@...r.kernel.org, loongarch@...ts.linux.dev,
        arnd@...db.de, deller@....de, chenhuacai@...nel.org,
        javierm@...hat.com, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org,
        James.Bottomley@...senpartnership.com,
        linux-m68k@...ts.linux-m68k.org, geert@...ux-m68k.org,
        linux-parisc@...r.kernel.org, vgupta@...nel.org,
        sparclinux@...r.kernel.org, kernel@...0n.name,
        linux-snps-arc@...ts.infradead.org, davem@...emloft.net,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 5/6] fbdev: Move framebuffer I/O helpers into
 <asm/fb.h>

Hi Thomas,

> > But I am missing something somewhere as I cannot see how this builds.
> > asm-generic now provide the fb_read/fb_write helpers.
> > But for example sparc has an architecture specifc fb.h so it will not
> > use the asm-generic variant. So I wonder how sparc get hold of the
> > asm-generic fb.h file?
> 
> All architecture's <asm/fb.h> files include <asm-generic/fb.h>, so that they
> all get the interfaces which they don't define themselves. For Sparc, this
> is at [1].
> 
> Best regards
> Thomas
> 
> 
> [1]
> https://cgit.freedesktop.org/drm/drm-tip/tree/arch/sparc/include/asm/fb.h#n19
> 
> > 
> > Maybe it is obvious, but I miss it.

OK, it was obvious and I missed it.
I looked at the mainline kernel, and not the drm-tip variant.
Sorry for the noise.

	Sam