make iio/dummy/iio_dummy_evgen.ko build errors

  SYSTBL  arch/x86/entry/syscalls/../../include/generated/asm/syscalls_32.h
  SYSHDR  arch/x86/entry/syscalls/../../include/generated/asm/unistd_32_ia32.h
  SYSHDR  arch/x86/entry/syscalls/../../include/generated/asm/unistd_64_x32.h
  SYSTBL  arch/x86/entry/syscalls/../../include/generated/asm/syscalls_64.h
  SYSHDR  arch/x86/entry/syscalls/../../include/generated/uapi/asm/unistd_32.h
  SYSHDR  arch/x86/entry/syscalls/../../include/generated/uapi/asm/unistd_64.h
  SYSHDR  arch/x86/entry/syscalls/../../include/generated/uapi/asm/unistd_x32.h
  CHK     include/config/kernel.release
  CHK     include/generated/uapi/linux/version.h
  CHK     include/generated/utsrelease.h
  CC      kernel/bounds.s
  CHK     include/generated/bounds.h
  CHK     include/generated/timeconst.h
  CC      arch/x86/kernel/asm-offsets.s
  CHK     include/generated/asm-offsets.h
  UPD     include/generated/asm-offsets.h
  CALL    scripts/checksyscalls.sh
  CC      scripts/mod/empty.o
  MKELF   scripts/mod/elfconfig.h
  HOSTCC  scripts/mod/modpost.o
  CC      scripts/mod/devicetable-offsets.s
  GEN     scripts/mod/devicetable-offsets.h
  HOSTCC  scripts/mod/file2alias.o
  HOSTCC  scripts/mod/sumversion.o
  HOSTLD  scripts/mod/modpost
  HOSTCC  scripts/recordmcount
  CC [M]  drivers/iio/dummy/iio_dummy_evgen.o
  MODPOST 3016 modules
WARNING: could not open drivers/infiniband/hw/cxgb3/iwch_user.h: No such file or directory
WARNING: could not open drivers/infiniband/hw/cxgb4/user.h: No such file or directory
WARNING: could not open drivers/infiniband/hw/mlx4/user.h: No such file or directory
WARNING: could not open drivers/infiniband/hw/mlx5/user.h: No such file or directory
WARNING: could not open drivers/infiniband/hw/nes/nes_user.h: No such file or directory
WARNING: could not open drivers/infiniband/hw/ocrdma/ocrdma_abi.h: No such file or directory
WARNING: could not open drivers/staging/lustre/lustre/llite/llite_close.c: No such file or directory
WARNING: could not open drivers/staging/lustre/lustre/obdclass/linux/linux-obdo.c: No such file or directory
ERROR: "iio_register_sw_device_type" [drivers/iio/dummy/iio_dummy.ko] undefined!
ERROR: "iio_unregister_sw_device_type" [drivers/iio/dummy/iio_dummy.ko] undefined!
ERROR: "ftrace_graph_ret_addr" [arch/x86/oprofile/oprofile.ko] undefined!
scripts/Makefile.modpost:91: recipe for target '__modpost' failed
make[1]: *** [__modpost] Error 1
Makefile:1643: recipe for target 'drivers/iio/dummy/iio_dummy_evgen.ko' failed
make: *** [drivers/iio/dummy/iio_dummy_evgen.ko] Error 2