ERROR: "mc13xxx_parse_regulators_dt" [drivers/regulator/mc13892-regulator.ko] undefined!

this is with using ubuntus generic .config

  CC      arch/x86/boot/main.o
  CC      arch/x86/boot/version.o
  CC      arch/x86/boot/apm.o
  CC      arch/x86/boot/video-vesa.o
  LD      arch/x86/boot/setup.elf

OBJCOPY arch/x86/boot/setup.bin
OBJCOPY arch/x86/boot/vmlinux.bin
BUILD arch/x86/boot/bzImage
Setup is 16752 bytes (padded to 16896 bytes).
System is 4587 kB
CRC 5d463dba
Kernel: arch/x86/boot/bzImage is ready (#3)
Building modules, stage 2.
MODPOST 3362 modules
ERROR: "mc13xxx_parse_regulators_dt" [drivers/regulator/mc13892-regulator.ko] undefined!
ERROR: "mc13xxx_get_num_regulators_dt" [drivers/regulator/mc13892-regulator.ko] undefined!
WARNING: modpost: Found 26 section mismatch(es).
To see full details build your kernel with:
'make CONFIG_DEBUG_SECTION_MISMATCH=y'
make[1]: *** [__modpost] Error 1
make: *** [modules] Error 2

Justin P. Mattock