linux-kernel - Re: [PATCH v2] staging/olpc_dcon: fix kconfig to fix build errors

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Message-ID: <20131015192429.GA6063@kroah.com>
Date:	Tue, 15 Oct 2013 12:24:29 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Randy Dunlap <rdunlap@...radead.org>
Cc:	kbuild test robot <fengguang.wu@...el.com>, kbuild-all@...org,
	"devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Daniel Drake <dsd@...top.org>,
	Jens Frederich <jfrederich@...il.com>,
	Jon Nettleton <jon.nettleton@...il.com>
Subject: Re: [PATCH v2] staging/olpc_dcon: fix kconfig to fix build errors

On Mon, Oct 14, 2013 at 03:26:39PM -0700, Randy Dunlap wrote:
> On 10/14/13 09:33, Greg Kroah-Hartman wrote:
> > On Sun, Oct 13, 2013 at 12:30:00PM -0700, Randy Dunlap wrote:
> >> From: Randy Dunlap <rdunlap@...radead.org>
> >>
> >> Fix build errors when GPIO_CS5535=m and FB_OLPC_DCON=y
> >> by preventing that kconfig combination.
> >>
> >> These build errors are caused by having a kconfig bool symbol
> >> (FB_OLPC_DCON_1) that depend on a tristate symbol (GPIO_CS5535),
> >> but when the tristate symbol is =m, the bool symbol is =y.
> >>
> >>   drivers/built-in.o: In function `dcon_read_status_xo_1':
> >>   olpc_dcon_xo_1.c:(.text+0x359531): undefined reference to `cs5535_gpio_set'
> >>   drivers/built-in.o: In function `dcon_wiggle_xo_1':
> >>   olpc_dcon_xo_1.c:(.text+0x35959f): undefined reference to `cs5535_gpio_set'
> >>   olpc_dcon_xo_1.c:(.text+0x359610): undefined reference to `cs5535_gpio_clear'
> >>   drivers/built-in.o:olpc_dcon_xo_1.c:(.text+0x3596a1): more undefined references to `cs5535_gpio_clear' follow
> >>   drivers/built-in.o: In function `dcon_wiggle_xo_1':
> >>   olpc_dcon_xo_1.c:(.text+0x359708): undefined reference to `cs5535_gpio_set'
> >>   drivers/built-in.o: In function `dcon_init_xo_1':
> >>   olpc_dcon_xo_1.c:(.text+0x35989b): undefined reference to `cs5535_gpio_clear'
> >>   olpc_dcon_xo_1.c:(.text+0x3598b5): undefined reference to `cs5535_gpio_isset'
> >>   olpc_dcon_xo_1.c:(.text+0x359963): undefined reference to `cs5535_gpio_setup_event'
> >>   olpc_dcon_xo_1.c:(.text+0x359980): undefined reference to `cs5535_gpio_set_irq'
> >>   olpc_dcon_xo_1.c:(.text+0x359a36): undefined reference to `cs5535_gpio_set'
> >>
> >> However, adding GPIO_CS5535 to the Kconfig dependencies also creates
> >> a kconfig recursive dependency error on powerpc:
> >>   drivers/i2c/Kconfig:5:error: recursive dependency detected!
> >>   drivers/i2c/Kconfig:5:	symbol I2C is selected by FB_OLPC_DCON
> >>   drivers/staging/olpc_dcon/Kconfig:1:	symbol FB_OLPC_DCON depends on GPIO_CS5535
> >>   drivers/gpio/Kconfig:577:	symbol GPIO_CS5535 depends on GPIOLIB
> >>   drivers/gpio/Kconfig:38:	symbol GPIOLIB is selected by ARCH_REQUIRE_GPIOLIB
> >>   drivers/gpio/Kconfig:23:	symbol ARCH_REQUIRE_GPIOLIB is selected by MCU_MPC8349EMITX
> >>   arch/powerpc/platforms/Kconfig:351:	symbol MCU_MPC8349EMITX depends on I2C
> >>
> >> This is due to FB_OLPC_DCON selecting I2C instead of depending on it,
> >> so change the select to a dependency.
> >>
> >> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
> >> Cc:	Daniel Drake <dsd@...top.org>
> >> Cc:	Jens Frederich <jfrederich@...il.com>
> >> Cc:	Jon Nettleton <jon.nettleton@...il.com>
> >> ---
> >>  drivers/staging/olpc_dcon/Kconfig |    3 ++-
> >>  1 file changed, 2 insertions(+), 1 deletion(-)
> >>
> >> --- lnx-312-rc4.orig/drivers/staging/olpc_dcon/Kconfig
> >> +++ lnx-312-rc4/drivers/staging/olpc_dcon/Kconfig
> >> @@ -1,7 +1,8 @@
> >>  config FB_OLPC_DCON
> >>  	tristate "One Laptop Per Child Display CONtroller support"
> >>  	depends on OLPC && FB
> >> -	select I2C
> >> +	depends on I2C
> >> +	depends on (GPIO_CS5535 || GPIO_CS5535=n)
> > 
> > 
> > This fails to apply to my staging-next branch of staging.git due to a
> > previous patch from you to try to fix this same issue (or maybe a
> > different one, I don't know...)
> 
> 
> You had asked if the previous patch should be reverted and I replied (very
> belatedly) Yes.  However, I'll be glad to make a new patch against
> linux-next instead of mainline.

Ah, missed that, I've now reverted it and will apply this one instead.

thanks,

greg k-h
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