linux-kernel - Re: [PATCH 09/21] fbcon: Replace FBCON_FLAGS

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Date:   Thu, 3 Feb 2022 14:47:13 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Thomas Zimmermann <tzimmermann@...e.de>
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>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Du Cheng <ducheng2@...il.com>, Claudio Suarez <cssk@...-c.es>
Subject: Re: [PATCH 09/21] fbcon: Replace FBCON_FLAGS_INIT with a boolean

On Wed, Feb 2, 2022 at 10:25 AM Thomas Zimmermann <tzimmermann@...e.de> wrote:
> Am 31.01.22 um 22:05 schrieb Daniel Vetter:
> > It's only one flag and slightly tidier code.
> >
> > Signed-off-by: Daniel Vetter <daniel.vetter@...el.com>
> > Cc: Daniel Vetter <daniel@...ll.ch>
> > Cc: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
> > Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> > Cc: Du Cheng <ducheng2@...il.com>
> > Cc: Thomas Zimmermann <tzimmermann@...e.de>
> > Cc: Claudio Suarez <cssk@...-c.es>
>
> Acked-by: Thomas Zimmermann <tzimmermann@...e.de>

> > +++ b/drivers/video/fbdev/core/fbcon.h
> > @@ -18,8 +18,6 @@
> >
> >   #include <asm/io.h>
> >
> > -#define FBCON_FLAGS_INIT         1
> > -
> >      /*
> >       *    This is the interface between the low-level console driver and the
> >       *    low-level frame buffer device
> > @@ -77,7 +75,7 @@ struct fbcon_ops {
> >       int    blank_state;
> >       int    graphics;
> >       int    save_graphics; /* for debug enter/leave */
> > -     int    flags;
> > +     bool   initialized;
>
> This will add 3 bytes of padding. Maybe you can put the bool elsewhere.

Several of the int variables are used as boolean flags, too.
Perhaps convert them all to bitfields?

    unsigned int initialized : 1;
    ...

> >       int    rotate;
> >       int    cur_rotate;
> >       char  *cursor_data;

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