linux-kernel - Re: [PATCH 21/21] fbdev: Make registered

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Date:   Fri, 4 Feb 2022 09:30:56 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Daniel Vetter <daniel.vetter@...ll.ch>
Cc:     DRI Development <dri-devel@...ts.freedesktop.org>,
        Intel Graphics Development <intel-gfx@...ts.freedesktop.org>,
        Linux Fbdev development list <linux-fbdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Jens Frederich <jfrederich@...il.com>,
        Jon Nettleton <jon.nettleton@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-staging@...ts.linux.dev,
        Daniel Vetter <daniel.vetter@...el.com>,
        Daniel Vetter <daniel@...ll.ch>, Helge Deller <deller@....de>,
        Matthew Wilcox <willy@...radead.org>,
        Sam Ravnborg <sam@...nborg.org>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        Zhen Lei <thunder.leizhen@...wei.com>,
        Alex Deucher <alexander.deucher@....com>,
        Xiyu Yang <xiyuyang19@...an.edu.cn>,
        Zheyu Ma <zheyuma97@...il.com>,
        Guenter Roeck <linux@...ck-us.net>
Subject: Re: [PATCH 21/21] fbdev: Make registered_fb[] private to fbmem.c

Hi Daniel,

Thanks for your patch!

On Tue, Feb 1, 2022 at 9:50 PM Daniel Vetter <daniel.vetter@...ll.ch> wrote:
> Well except when the olpc dcon fbdev driver is enabled, that thing
> digs around in there in rather unfixable ways.

Can't the actual frame buffer driver (which one?) used on olpc export
a pointer to its fb_info?

> --- a/drivers/video/fbdev/core/fbmem.c
> +++ b/drivers/video/fbdev/core/fbmem.c
> @@ -48,10 +48,14 @@
>  static DEFINE_MUTEX(registration_lock);
>
>  struct fb_info *registered_fb[FB_MAX] __read_mostly;
> -EXPORT_SYMBOL(registered_fb);
> -
>  int num_registered_fb __read_mostly;
> +#if IS_ENABLED(CONFIG_OLPC_DCON)

CONFIG_FB_OLPC_DCON (everywhere), cfr. the build failure reported
by the robot.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds