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

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Date:	Sat, 09 Mar 2013 00:10:12 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	Josh Boyer <jwboyer@...hat.com>
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 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
static void __unused splat(void) {
#       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).

thanks,
-- 
js
suse labs
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