Re: [PATCH 3/5] input: keyboard: add COMPILE_TEST support for KEYBOARD_IMX_SC_KEY

From: Dmitry Torokhov <dmitry.torokhov@gmail•com>
To: Anson Huang <anson.huang@nxp•com>
Cc: "Alexandre Belloni" <alexandre.belloni@bootlin•com>,
	"Marco Felsch" <m.felsch@pengutronix•de>,
	"Fabio Estevam" <festevam@gmail•com>,
	"linux-rtc@vger•kernel.org" <linux-rtc@vger•kernel.org>,
	"amit.kucheria@verdurent•com" <amit.kucheria@verdurent•com>,
	"wim@linux-watchdog•org" <wim@linux-watchdog•org>,
	"Daniel Lezcano" <daniel.lezcano@linaro•org>,
	"Krzysztof Kozlowski" <krzk@kernel•org>,
	dl-linux-imx <linux-imx@nxp•com>,
	"linux-input@vger•kernel.org" <linux-input@vger•kernel.org>,
	"Zhang Rui" <rui.zhang@intel•com>,
	"Ronald Tschalär" <ronald@innovation•ch>,
	"Guenter Roeck" <linux@roeck-us•net>,
	LINUXWATCHDOG <linux-watchdog@vger•kernel.org>,
	"Arnd Bergmann" <arnd@arndb•de>,
	"Linux PM" <linux-pm@vger•kernel.org>,
	"Sascha Hauer" <s.hauer@pengutronix•de>,
	"Thomas Gleixner" <tglx@linutronix•de>,
	"Andy Shevchenko" <andriy.shevchenko@linux•intel.com>,
	"Daniel Baluta" <daniel.baluta@nxp•com>,
	linux-arm-kernel <linux-arm-kernel@lists•infradead.org>,
	"Alessandro Zummo" <a.zummo@towertech•it>,
	"Greg Kroah-Hartman" <gregkh@linuxfoundation•org>,
	lkml <linux-kernel@vger•kernel.org>,
	"Oleksij Rempel" <linux@rempel-privat•de>,
	"Sascha Hauer" <kernel@pengutronix•de>,
	"Enric Balletbo i Serra" <enric.balletbo@collabora•com>,
	"Shawn Guo" <shawnguo@kernel•org>
Subject: Re: [PATCH 3/5] input: keyboard: add COMPILE_TEST support for KEYBOARD_IMX_SC_KEY
Date: Fri, 6 Mar 2020 16:51:46 -0800	[thread overview]
Message-ID: <20200307005146.GM217608@dtor-ws> (raw)
In-Reply-To: <DB3PR0402MB3916EA7BAACBBE64F2609DB6F5E00@DB3PR0402MB3916.eurprd04.prod.outlook.com>

On Sat, Mar 07, 2020 at 12:18:38AM +0000, Anson Huang wrote:
> Hi, Dmitry
> 
> > Subject: Re: [PATCH 3/5] input: keyboard: add COMPILE_TEST support for
> > KEYBOARD_IMX_SC_KEY
> > 
> > On Fri, Mar 6, 2020 at 11:33 AM Dmitry Torokhov
> > <dmitry.torokhov@gmail•com> wrote:
> > >
> > > On Fri, Mar 06, 2020 at 11:42:34PM +0800, Anson Huang wrote:
> > > > Add COMPILE_TEST support to i.MX SC keyboard driver for better
> > > > compile testing coverage.
> > > >
> > > > Signed-off-by: Anson Huang <Anson.Huang@nxp•com>
> > >
> > > Applied, thank you.
> > 
> > Actually, not:
> > 
> > ERROR: "imx_scu_irq_register_notifier"
> > [drivers/input/keyboard/imx_sc_key.ko] undefined!
> > ERROR: "imx_scu_get_handle" [drivers/input/keyboard/imx_sc_key.ko]
> > undefined!
> > ERROR: "imx_scu_call_rpc" [drivers/input/keyboard/imx_sc_key.ko]
> > undefined!
> > ERROR: "imx_scu_irq_unregister_notifier"
> > [drivers/input/keyboard/imx_sc_key.ko] undefined!
> > ERROR: "imx_scu_irq_group_enable"
> > [drivers/input/keyboard/imx_sc_key.ko] undefined!
> > make[1]: *** [scripts/Makefile.modpost:94: __modpost] Error 1
> > make: *** [Makefile:1282: modules] Error 2
> > 
> > If you want to enable compile test coverage you need to provide stubs for
> > the above functions.
> 
> These i.MX SCU drivers depends on IMX_SCU, I already add the COMPILE_TEST
> to IMX_SCU driver as well, that is why I put these patches in a patch series.

Adding "|| COMPILE_TEST" you are removing hard dependency on IMX_SCU,
which as you can see can result in broken build.

> Maybe
> I can add stubs as well to make sure build passed even when IMX_SCU is NOT compiled?
> Will send V2 to add stubs, it makes more sense.

It is up to you whether you make IMX_SCU buildable with COMPILE_TEST
and leave the sub-driver as is, or add the stubs and make sub-drivers
buildable even without IMX_SCU being present.

Thanks.

-- 
Dmitry

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