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

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Date:   Tue, 8 Feb 2022 15:04:51 +0100
From:   Daniel Vetter <daniel@...ll.ch>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Daniel Vetter <daniel.vetter@...ll.ch>,
        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

On Fri, Feb 04, 2022 at 09:30:56AM +0100, Geert Uytterhoeven wrote:
> 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?

Yeah that might be the right thing to do, I'll add that as a stagin TODO
in the next iteration.

> 
> > --- 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.

Yeah realized that too and fixed it locally.

Cheers, Daniel

> 
> 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

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch