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

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Date:	Mon, 14 Oct 2013 15:26:39 -0700
From:	Randy Dunlap <rdunlap@...radead.org>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.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 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.


-- 
~Randy
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