linux-kernel - Re: 8250.nr_uarts broken in 3.7

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Message-ID: <20130308234404.GP13719@hansolo.jdub.homelinux.org>
Date:	Fri, 8 Mar 2013 18:44:04 -0500
From:	Josh Boyer <jwboyer@...hat.com>
To:	Jiri Slaby <jslaby@...e.cz>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: 8250.nr_uarts broken in 3.7

On Fri, Mar 08, 2013 at 06:28:09PM -0500, Josh Boyer wrote:
> On Sat, Mar 09, 2013 at 12:14:23AM +0100, Jiri Slaby wrote:
> > On 03/09/2013 12:10 AM, Jiri Slaby wrote:
> > > On 03/08/2013 11:58 PM, Jiri Slaby wrote:
> > >> On 03/08/2013 11:49 PM, Josh Boyer wrote:
> > >>> On Fri, Mar 08, 2013 at 11:47:01PM +0100, Jiri Slaby wrote:
> > >>>> Yeah, I agree this is ugly. Just re-definining MODULE_PARAM_PREFIX at
> > >>>> the end of the file should do the trick (followed by
> > >>>> "module_param(nr_uarts, uint, 0644)").
> > >>>
> > >>> For some reason, I thought I had tried that.  Maybe I didn't.  I'll look
> > >>> into it again.
> > >>
> > >> I see. Because we would re-define some global variables. What if we put
> > >> module_param into a function?
> > > 
> > > Something like this?
> > > #ifdef MODULE
> 
> I don't think you want this surrounded in #ifdef MODULE, do you?  That
> won't let people building the driver into the kernel continue to use
> 8250.<whatever> on the kernel command line.
> 
> > > static void __unused splat(void) {
> > 
> > I meant __used. It should make no difference though.
> > 
> > > #       undef MODULE_PARAM_PREFIX
> > > #       define MODULE_PARAM_PREFIX "8250."
> > >         module_param_cb(nr_uarts, &param_ops_uint, &nr_uarts, 0644);
> > >         ...
> > > }
> > > #endif
> > > 
> > > Not nice, but should work. The other way is to have those in a separate
> > > file linked to 8250 (to avoid re-definition errors).
> 
> Ew.  I'll try the function first.

OK, the function (without the surrounding ifdef) seems to be working OK.
I'll do a bit more testing and send out a v2 in a bit.

Thanks for the tip.  It's still not pretty, but at least I don't feel
ashamed about it.

josh
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