$ make
scripts/kconfig/conf -s arch/x86/Kconfig
  CHK     include/linux/version.h
  CHK     include/linux/utsrelease.h
  UPD     include/linux/utsrelease.h
  CALL    scripts/checksyscalls.sh
  CHK     include/linux/compile.h
  CC      init/version.o
  LD      init/built-in.o
  CC      kernel/module.o
  LD      kernel/built-in.o
  CC      drivers/char/keyboard.o
drivers/char/keyboard.c:134: error: redefinition of '__kcrctab_k_handler'
drivers/char/keyboard.c:104: error: previous definition of '__kcrctab_k_handler' was here
drivers/char/keyboard.c:134: error: redefinition of '__kstrtab_k_handler'
drivers/char/keyboard.c:104: error: previous definition of '__kstrtab_k_handler' was here
drivers/char/keyboard.c:134: error: redefinition of '__ksymtab_k_handler'
drivers/char/keyboard.c:104: error: previous definition of '__ksymtab_k_handler' was here
make[2]: *** [drivers/char/keyboard.o] Error 1
make[1]: *** [drivers/char] Error 2
make: *** [drivers] Error 2