linux-kernel - Re: [PATCH v2 1/2] fbdev: Split frame buffer support in FB and FB

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Message-ID: <87o7ktz8fd.fsf@minerva.mail-host-address-is-not-set>
Date:   Mon, 03 Jul 2023 10:49:26 +0200
From:   Javier Martinez Canillas <javierm@...hat.com>
To:     Thomas Zimmermann <tzimmermann@...e.de>,
        linux-kernel@...r.kernel.org
Cc:     linux-fbdev@...r.kernel.org, Randy Dunlap <rdunlap@...radead.org>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Helge Deller <deller@....de>, x86@...nel.org,
        dri-devel@...ts.freedesktop.org,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        "H. Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...en8.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Sam Ravnborg <sam@...nborg.org>
Subject: Re: [PATCH v2 1/2] fbdev: Split frame buffer support in FB and
 FB_CORE symbols

Thomas Zimmermann <tzimmermann@...e.de> writes:

[...]

>>>>    config FB_DEVICE
>>>>    	bool "Provide legacy /dev/fb* device"
>>>> -	depends on FB
>>>> +	select FB_CORE
>>>
>>> This should depend on FB_CORE.
>>>
>> 
>> Yes, already fixed in v3 too. I did a select to prevent symbol circular
>> dependencies but doing that lead to CONFIG_FB_CORE=y even if CONFIG_DRM
>> was set as a module.
>> 
>> But with the "select FB_CORE if DRM_FBDEV_EMULATION" in the DRM symbol as
>> Arnd suggested, I was able to have FB_DEVICE to depend on FB_CORE again.
>
> BTW, where does this item now show up in the menu? It used to be in the 
> framebuffer menu. It's now in the graphics-drivers menu?
>

No, it's still in the framebuffer menu. But after the FB_CORE split the
menuconfig ends broken (no sub-level for fbdev drivers anymore).

I was talking with Arnd and Geert about this. I think that will pause this
series and instead first focus on cleaning up the fbdev Kconfig, then it
should be easier to add the FB_CORE on top of that.

> Best regards
> Thomas
>

-- 
Best regards,

Javier Martinez Canillas
Core Platforms
Red Hat