Sorry all. Been travelling (stuck in a clean room with no internet...) Should get a pull
 out sometime tomorrow.



On 26 February 2015 21:23:02 GMT+00:00, Arnd Bergmann <arnd@arndb.de> wrote:
>On Thursday 26 February 2015 12:44:32 Andrew Morton wrote:
>> On Thu, 26 Feb 2015 15:36:18 +0800 kbuild test robot
><fengguang.wu@intel.com> wrote:
>> 
>> > It's probably a bug fix that unveils the link errors.
>> > 
>> > tree:   git://git.cmpxchg.org/linux-mmotm.git master
>> > head:   87bf5bee8749a1d3c82d12a55a1e33f6a22da8ed
>> > commit: 7d789876f1a932dfa1a70ae8eeba270aa34358ad [7/197] rtc:
>ds1685: fix ds1685_rtc_alarm_irq_enable build error
>> > config: i386-randconfig-nexr0-0226 (attached as .config)
>> > reproduce:
>> >   git checkout 7d789876f1a932dfa1a70ae8eeba270aa34358ad
>> >   # save the attached .config to linux build tree
>> >   make ARCH=i386 
>> > 
>> > All error/warnings:
>> > 
>> >    drivers/built-in.o: In function `ak8975_set_mode':
>> > >> ak8975.c:(.text+0x16c108): undefined reference to
>`i2c_smbus_write_byte_data'
>> >    drivers/built-in.o: In function `ak8975_probe':
>> > >> ak8975.c:(.text+0x16c29b): undefined reference to
>`i2c_smbus_read_i2c_block_data'
>> > >> ak8975.c:(.text+0x16c348): undefined reference to
>`i2c_smbus_read_i2c_block_data'
>> >    drivers/built-in.o: In function `ak8975_read_raw':
>> > >> ak8975.c:(.text+0x16c66b): undefined reference to
>`i2c_smbus_read_byte_data'
>> > >> ak8975.c:(.text+0x16c6a2): undefined reference to
>`i2c_smbus_read_byte_data'
>> > >> ak8975.c:(.text+0x16c6c6): undefined reference to
>`i2c_smbus_read_byte_data'
>> > >> ak8975.c:(.text+0x16c751): undefined reference to
>`i2c_smbus_read_word_data'
>> >    drivers/built-in.o: In function `ak8975_driver_init':
>> > >> ak8975.c:(.init.text+0x10e35): undefined reference to
>`i2c_register_driver'
>> >    drivers/built-in.o: In function `ak8975_driver_exit':
>> > >> ak8975.c:(.exit.text+0x1841): undefined reference to
>`i2c_del_driver'
>> 
>> Yes, something seems to have gone spectacularly wrong here.  "rtc:
>> ds1685: fix ds1685_rtc_alarm_irq_enable build error" has nothing to
>do
>> with i2c or with drivers/iio/magnetometer/ak8975.c.
>> 
>> And CONFIG_AK8975 depends on CONFIG_I2C.
>
>I've also submitted a patch for this bug:
>
>From 84f1bf2e4c22183a61c04dfa2cead4a91665c920 Mon Sep 17 00:00:00 2001
>From: Arnd Bergmann <arnd@arndb.de>
>Date: Tue, 27 Jan 2015 22:08:47 +0100
>Subject: [PATCH] iio: ak8975: fix AK09911 dependencies
>
>ak8975 depends on I2C and GPIOLIB, so any symbols that selects
>ak8975 must have the same dependency, or we get build errors:
>
>drivers/iio/magnetometer/ak8975.c: In function 'ak8975_who_i_am':
>drivers/iio/magnetometer/ak8975.c:393:2: error: implicit declaration of
>function 'i2c_smbus_read_i2c_block_data'
>[-Werror=implicit-function-declaration]
>  ret = i2c_smbus_read_i2c_block_data(client, AK09912_REG_WIA1,
>  ^
>drivers/iio/magnetometer/ak8975.c: In function 'ak8975_set_mode':
>drivers/iio/magnetometer/ak8975.c:431:2: error: implicit declaration of
>function 'i2c_smbus_write_byte_data'
>[-Werror=implicit-function-declaration]
>  ret = i2c_smbus_write_byte_data(data->client,
>
>Signed-off-by: Arnd Bergmann <arnd@arndb.de>
>Fixes: 57e73a423b1e85 ("iio: ak8975: add ak09911 and ak09912 support")
>
>diff --git a/drivers/iio/magnetometer/Kconfig
>b/drivers/iio/magnetometer/Kconfig
>index 4c7a4c52dd06..a5d6de72c523 100644
>--- a/drivers/iio/magnetometer/Kconfig
>+++ b/drivers/iio/magnetometer/Kconfig
>@@ -18,6 +18,8 @@ config AK8975
> 
> config AK09911
> 	tristate "Asahi Kasei AK09911 3-axis Compass"
>+	depends on I2C
>+	depends on GPIOLIB
> 	select AK8975
> 	help
> 	  Deprecated: AK09911 is now supported by AK8975 driver.
>
>
>http://lists.infradead.org/pipermail/linux-arm-kernel/2015-January/320527.html
>
>Randy submitted the same patch:
>https://lkml.org/lkml/2015/2/4/570
>
>Jonathan said he'd take care of it, but so far has not applied either
>version.
>
>	Arnd

-- 
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