linux-kernel - Re: [PATCH v8 1/6] Extcon (external connector): import Android's switch class and modify.

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Date:	Thu, 19 Apr 2012 20:00:46 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Kyungmin Park <kyungmin.park@...sung.com>
Cc:	MyungJoo Ham <myungjoo.ham@...sung.com>,
	Arnd Bergmann <arnd@...db.de>,
	LKML <linux-kernel@...r.kernel.org>, NeilBrown <neilb@...e.de>,
	Randy Dunlap <rdunlap@...otime.net>,
	Mike Lockwood <lockwood@...roid.com>,
	Arve Hjønnevag <arve@...roid.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Morten CHRISTIANSEN <morten.christiansen@...ricsson.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	John Stultz <john.stultz@...aro.org>,
	Joerg Roedel <joerg.roedel@....com>, myungjoo.ham@...il.com,
	cw00.choi@...sung.com
Subject: Re: [PATCH v8 1/6] Extcon (external connector): import Android's
 switch class and modify.

On Fri, Apr 20, 2012 at 11:57:26AM +0900, Kyungmin Park wrote:
> On 4/20/12, Greg KH <gregkh@...uxfoundation.org> wrote:
> > On Fri, Apr 20, 2012 at 11:46:25AM +0900, Kyungmin Park wrote:
> >> On 4/20/12, Greg KH <gregkh@...uxfoundation.org> wrote:
> >> > On Thu, Apr 19, 2012 at 11:41:33AM +0900, MyungJoo Ham wrote:
> >> >> External connector class (extcon) is based on and an extension of
> >> >> Android kernel's switch class located at linux/drivers/switch/.
> >> >
> >> > Oh come on, this still breaks the build, it is as if you didn't even
> >> > test this at all, or modify anything since I reported it as a problem to
> >> > you yesterday:
> >> >
> >> > drivers/extcon/extcon_class.c:79:6: error: redefinition of
> >> > ‘extcon_set_state’
> >> > include/linux/extcon.h:80:20: note: previous definition of
> >> > ‘extcon_set_state’ was here
> >> > drivers/extcon/extcon_class.c:170:5: error: redefinition of
> >> > ‘extcon_dev_register’
> >> > include/linux/extcon.h:67:19: note: previous definition of
> >> > ‘extcon_dev_register’ was here
> >> > drivers/extcon/extcon_class.c:214:6: error: redefinition of
> >> > ‘extcon_dev_unregister’
> >> > include/linux/extcon.h:73:20: note: previous definition of
> >> > ‘extcon_dev_unregister’ was here
> >> >
> >> > You can do better than this, I know you can.
> >>
> >> Umm. can you show your EXTCON config? I think you build it as module.
> >> it's tested it extcon on or not. anyway I'll test it as module and
> >> check it.
> >
> > Yes, I selected to build it as a module, which, according to your patch,
> > is a valid selection.
> 
> Found, need to add CONFIG_EXTCON_MODULE at below.

You do know we have a new macro that handles all of this for you,
IS_ENABLED().  It handles the _MODULE stuff and the other stuff as well,
and you can put it in a .c expression also.

Try using that instead.

thanks,

greg k-h
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