linux-kernel - Re: [PATCH 06/21] fbcon: delete delayed loading code

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Message-ID: <YgKxwfjhL00hfdNk@ravnborg.org>
Date:   Tue, 8 Feb 2022 19:09:05 +0100
From:   Sam Ravnborg <sam@...nborg.org>
To:     DRI Development <dri-devel@...ts.freedesktop.org>,
        linux-fbdev@...r.kernel.org, Du Cheng <ducheng2@...il.com>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        Intel Graphics Development <intel-gfx@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Claudio Suarez <cssk@...-c.es>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Helge Deller <deller@....de>
Subject: Re: [PATCH 06/21] fbcon: delete delayed loading code

Hi Daniel,

On Tue, Feb 08, 2022 at 02:42:25PM +0100, Daniel Vetter wrote:
> On Thu, Feb 03, 2022 at 09:45:29PM +0100, Sam Ravnborg wrote:
> > Hi Daniel,
> > 
> > On Mon, Jan 31, 2022 at 10:05:37PM +0100, Daniel Vetter wrote:
> > > Before
> > > 
> > > commit 6104c37094e729f3d4ce65797002112735d49cd1
> > > Author: Daniel Vetter <daniel.vetter@...ll.ch>
> > > Date:   Tue Aug 1 17:32:07 2017 +0200
> > > 
> > >     fbcon: Make fbcon a built-time depency for fbdev
> > > 
> > > it was possible to load fbcon and fbdev drivers in any order, which
> > > means that fbcon init had to handle the case where fbdev drivers where
> > > already registered.
> > > 
> > > This is no longer possible, hence delete that code.
> > > 
> > > Note that the exit case is a bit more complex and will be done in a
> > > separate patch.
> > > 
> > > Signed-off-by: Daniel Vetter <daniel.vetter@...el.com>
> > > Cc: Helge Deller <deller@....de>
> > > Cc: Daniel Vetter <daniel@...ll.ch>
> > > Cc: Claudio Suarez <cssk@...-c.es>
> > > Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> > > Cc: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
> > > Cc: Du Cheng <ducheng2@...il.com>
> > > ---
> > >  drivers/video/fbdev/core/fbcon.c | 13 +------------
> > >  1 file changed, 1 insertion(+), 12 deletions(-)
> > > 
> > > diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c
> > > index 8f971de35885..814b648e8f09 100644
> > > --- a/drivers/video/fbdev/core/fbcon.c
> > > +++ b/drivers/video/fbdev/core/fbcon.c
> > > @@ -942,7 +942,7 @@ static const char *fbcon_startup(void)
> > >  		return display_desc;
> > >  	/*
> > >  	 * Instead of blindly using registered_fb[0], we use info_idx, set by
> > > -	 * fb_console_init();
> > > +	 * fbcon_fb_registered();
> > >  	 */
> > This comment change looks like it does not belong in this patch.
> > Also, the comment is wrong as info_idx is set in several places.
> > Like set_con2fb_map(), fbcon_remap_all(), and more.
> 
> Yeah I can split this out into a separate patch, but I spotted this wrong
> comment as part of reviewing this code change here - essentially you have
> to check how fb_info for fbcon are registered and fbcon init happens to
> validate that deleting the below code is correct.
> 
> Ok if I put this explainer into the commit message, or do you want me to
> split this out fully?
Keep it and add my a-b

	Sam