device_sysfs.c:undefined reference to `utf16s_to_utf8s'

[kbuild test robot]

Hi Sinan,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   28e8c4bc8eb483c22d977e147a0b98fc63efadf7
commit: 5d32a66541c4683456507481a0944ed2985e75c7 PCI/ACPI: Allow ACPI to be built without CONFIG_PCI set
date:   13 days ago
config: i386-alldefconfig (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        git checkout 5d32a66541c4683456507481a0944ed2985e75c7
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   drivers/acpi/device_sysfs.o: In function `description_show':
>> device_sysfs.c:(.text+0x44b): undefined reference to `utf16s_to_utf8s'

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