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

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Date:   Tue, 8 Feb 2022 21:59:33 +0100
From:   Daniel Vetter <daniel@...ll.ch>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        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>,
        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 Tue, Feb 08, 2022 at 03:04:51PM +0100, Daniel Vetter wrote:
> 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.

Well I tried to do that and noticed I've done that already in 2019:

commit af1440368837f19ac7d5dec05d929d91308f5a90
Author: Daniel Vetter <daniel.vetter@...ll.ch>
Date:   Tue May 28 11:03:03 2019 +0200

    staging/olpc_dcon: Add drm conversion to TODO

TODO already explains how this should be done correctly in drm. Well maybe
we should add that stitching the drivers together should be done with
component.c or something like that.
-Daniel

> 
> > 
> > > --- 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

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