linux-kernel - Re: [PATCH 03/11] fblog: new framebuffer kernel log dummy driver

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Message-ID: <CANq1E4Q1YHw7HJ7bu41PPnk6MhzZ7UTjM-sXBbVuNuA5GjeE7Q@mail.gmail.com>
Date:	Tue, 14 Aug 2012 11:42:13 +0200
From:	David Herrmann <dh.herrmann@...glemail.com>
To:	Ryan Mallon <rmallon@...il.com>
Cc:	linux-fbdev@...r.kernel.org,
	Florian Tobias Schandinat <FlorianSchandinat@....de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-serial@...r.kernel.org, Alan Cox <alan@...rguk.ukuu.org.uk>,
	linux-kernel@...r.kernel.org,
	Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: Re: [PATCH 03/11] fblog: new framebuffer kernel log dummy driver

Hi Ryan

On Mon, Aug 13, 2012 at 1:34 AM, Ryan Mallon <rmallon@...il.com> wrote:
> >  config VGA_CONSOLE
> >       bool "VGA text console" if EXPERT || !X86
> > -     depends on !4xx && !8xx && !SPARC && !M68K && !PARISC && !FRV &&
> > !SUPERH && !BLACKFIN && !AVR32 && !MN10300 && (!ARM || ARCH_FOOTBRIDGE ||
> > ARCH_INTEGRATOR || ARCH_NETWINDER)
> > +     depends on VT && !4xx && !8xx && !SPARC && !M68K && !PARISC &&
> > !FRV && !SUPERH && !BLACKFIN && !AVR32 && !MN10300 && (!ARM ||
> > ARCH_FOOTBRIDGE || ARCH_INTEGRATOR || ARCH_NETWINDER)
> >       default y
> >       help
> >         Saying Y here will allow you to use Linux in text mode through a
> > @@ -45,7 +45,7 @@ config VGACON_SOFT_SCROLLBACK_SIZE
> >        screenfuls of scrollback buffer
>
> You could just place all of the CONFIG_VT options inside an if VT and
> then the new fblog options in the else case rather than modifying all of
> the (already overly long) depends statements.

Indeed, that sounds better.

> > +config FBLOG
> > +     tristate "Framebuffer Kernel Log Driver"
> > +     depends on !VT && FB
> > +     default n
>
> Default n is not required, all options are default n unless otherwise
> specified. I don't think you need the dependency on FB either, since
> this file should only get included if CONFIG_FB is set?

I will remove the default-line, but the FB-dependency is required. The
"console/" directory includes also drivers like vgacon which do not
depend on FB so it gets always included.

> > +     help
> > +       This driver displays all kernel log messages on all connected
> > +       framebuffers. It is mutually exclusive with
> > CONFIG_FRAMEBUFFER_CONSOLE
> > +       and CONFIG_VT. It was mainly created for debugging purposes when
> > +       CONFIG_VT is not selected but you still want kernel boot
> > messages on
> > +       the screen.
>
> Do command line options exist to specify screens to write the debug log
> to? It might be a useful feature to have.

See patch-7. However, I am not entirely happy with it. I will probably
have to rethink the parameters.

Thanks for reviewing. I will fix all these in the next series.
Regards
David
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