Hi Arnd,

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'

---
0-DAY kernel test infrastructure                Open Source Technology Center
http://lists.01.org/mailman/listinfo/kbuild                 Intel Corporation