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Date:   Wed, 12 Jun 2019 18:56:29 +0100
From:   Sean Young <sean@mess.org>
To:     Mauro Carvalho Chehab <mchehab@kernel.org>
Cc:     YueHaibing <yuehaibing@huawei.com>, tglx@linutronix.de,
        corbet@lwn.net, gregkh@linuxfoundation.org,
        linux-kernel@vger.kernel.org, linux-media@vger.kernel.org
Subject: Re: [PATCH] media: ttpci: Fix build error without RC_CORE
Message-ID: <20190612175629.srfw7ybr256se5rt@gofer.mess.org>
References: <20190612034310.4640-1-yuehaibing@huawei.com>
 <20190612074254.eky2xo7bajorkhfy@gofer.mess.org>
 <20190612063708.64498b44@coco.lan>
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On Wed, Jun 12, 2019 at 06:37:08AM -0300, Mauro Carvalho Chehab wrote:
> Em Wed, 12 Jun 2019 08:42:55 +0100
> Sean Young <sean@mess.org> escreveu:
> 
> > On Wed, Jun 12, 2019 at 11:43:10AM +0800, YueHaibing wrote:
> > > If RC_CORE is not set, building fails:
> > > 
> > > drivers/media/pci/ttpci/av7110_ir.o: In function `av7110_ir_init':
> > > av7110_ir.c:(.text+0x1b0): undefined reference to `rc_allocate_device'
> > > av7110_ir.c:(.text+0x2c1): undefined reference to `rc_register_device'
> > > av7110_ir.c:(.text+0x2dc): undefined reference to `rc_free_device'
> > > 
> > > Reported-by: Hulk Robot <hulkci@huawei.com>
> > > Fixes: 71f49a8bf5c5 ("media: ttpci: use rc-core for the IR receiver")
> > > Signed-off-by: YueHaibing <yuehaibing@huawei.com>  
> > 
> > Thank you for spotting this and writing a patch.
> > 
> > > ---
> > >  drivers/media/pci/ttpci/Kconfig | 2 +-
> > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > > 
> > > diff --git a/drivers/media/pci/ttpci/Kconfig b/drivers/media/pci/ttpci/Kconfig
> > > index d96d4fa..b705631 100644
> > > --- a/drivers/media/pci/ttpci/Kconfig
> > > +++ b/drivers/media/pci/ttpci/Kconfig
> > > @@ -7,7 +7,7 @@ config DVB_AV7110
> > >  	depends on DVB_CORE && PCI && I2C
> > >  	select TTPCI_EEPROM
> > >  	select VIDEO_SAA7146_VV
> > > -	select DVB_AV7110_IR if INPUT_EVDEV=y || INPUT_EVDEV=DVB_AV7110  
> > 
> > This says if
> >  - select DVB_AV7110_IR if INPUT_EVDEV and DVB_AV7110 are both y or m
> >  - select DVB_AV7110_IR if INPUT_EVDEV=y
> >    This exists for the case when INPUT_EVDEV=y and DVB_AV7110=m, which is fine
> > 
> > > +	select DVB_AV7110_IR if RC_CORE=DVB_AV7110 && (INPUT_EVDEV=y || INPUT_EVDEV=DVB_AV7110)  
> > 
> > That's not exactly the same. For one thing it should not longer depend on
> > INPUT_EVDEV=y.
> > 
> > Now if DVB_AV7110=m and RC_CORE=y is not allowed which should be (this is
> > the case in Fedora default kernel config for example).
> 
> My suggestion here is to stop using select here, using, instead
> a depends on for DVB_AV7110_IR, e. g. something like (untested):
> 
> config DVB_AV7110_IR
> 	bool
> 	depends on RC_CORE && DVB_AV7110
> 	default DVB_AV7110

Build will fail if RC_CORE=m && DVB_AV7110=y. So it should be

        depends on RC_CORE=y || RC_CORE = DVB_AV7110


Thanks,

Sean