Hi Boris,

I love your patch! Yet something to improve:

[auto build test ERROR on char-misc/char-misc-testing]
[also build test ERROR on v5.1-rc3 next-20190401]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Boris-Brezillon/eeprom-at25-Convert-the-driver-to-the-spi-mem-interface/20190401-160450
config: i386-randconfig-m2-201913 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

>> ERROR: "spi_mem_driver_unregister" [drivers/misc/eeprom/at25.ko] undefined!
>> ERROR: "spi_mem_driver_register_with_owner" [drivers/misc/eeprom/at25.ko] undefined!
>> ERROR: "devm_spi_mem_dirmap_create" [drivers/misc/eeprom/at25.ko] undefined!
>> ERROR: "spi_mem_dirmap_write" [drivers/misc/eeprom/at25.ko] undefined!
>> ERROR: "spi_mem_dirmap_read" [drivers/misc/eeprom/at25.ko] undefined!
>> ERROR: "spi_mem_exec_op" [drivers/misc/eeprom/at25.ko] undefined!

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation