linux-kernel - Re: [PATCH 6/6] PM/FB/gxfb: add config option that allows disabling of VT switch during suspend

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Message-Id: <20080310145118.adb0cf1e.akpm@linux-foundation.org>
Date:	Mon, 10 Mar 2008 14:51:18 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Andres Salomon <dilinger@...ued.net>
Cc:	adaplas@...il.com, linux-kernel@...r.kernel.org,
	linux-fbdev-devel@...ts.sourceforge.net, info-linux@...de.amd.com,
	jordan.crouse@....com, rjw@...k.pl, samuel.thibault@...-lyon.org
Subject: Re: [PATCH 6/6] PM/FB/gxfb: add config option that allows disabling
 of VT switch during suspend

On Mon, 10 Mar 2008 17:44:24 -0400
Andres Salomon <dilinger@...ued.net> wrote:

> On Mon, 10 Mar 2008 14:19:39 -0700
> Andrew Morton <akpm@...ux-foundation.org> wrote:
> 
> > 
> > It would be far preferable to do this via a kernel boot parameter rather
> > than via a kernel rebuild.
> > 
> 
> Well, it shouldn't be supported at _all_ unless the framebuffer driver
> supports it; you're asking for it to be converted to something like the
> following?
> 
> 
> 
> #ifdef CONFIG_FBDEV_SUPPORTS_NOSWITCH
> static int no_vt_switch;
> #endif
> 
> int pm_prepare_console(void)
> {
> #ifdef CONFIG_FBDEV_SUPPORTS_NOSWITCH
> 	if (no_vt_switch)
> 		return 0;
> #endif
> 	...
> }
> 
> #ifdef CONFIG_FBDEV_SUPPORTS_NOSWITCH
> module_param(no_vt_switch, int, 0);
> MODULE_PARM_DESC(no_vt_switch, "...");
> #endif
> 
> 
> If so, that means extra #ifdef's sprinkled throughout the code.  Note
> that most framebuffer drivers won't be supporting this, and those that
> do will almost certainly always want vt switching turned off..
> 

I don't think you need any ifdefs or config options at all, do you?  Just
add a new module parameter to this driver and some little interface into
the PM core which allows the driver to set no_vt_switch?

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