[zen-kernel-zen-kernel:5.13/futex2 8/8] kernel/fork.o:undefined reference to `ksys_futex_wake'

[zen-kernel-zen-kernel:5.13/futex2 8/8] kernel/fork.o:undefined reference to `ksys_futex_wake'

[kernel test robot]

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tree:   https://github.com/zen-kernel/zen-kernel 5.13/futex2
head:   2568c65603cd0168a29fdf4564d80e447117916a
commit: 2568c65603cd0168a29fdf4564d80e447117916a [8/8] kernel: Enable waitpid() for futex2
config: microblaze-randconfig-r032-20210628 (attached as .config)
compiler: microblaze-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/zen-kernel/zen-kernel/commit/2568c65603cd0168a29fdf4564d80e447117916a
        git remote add zen-kernel-zen-kernel https://github.com/zen-kernel/zen-kernel
        git fetch --no-tags zen-kernel-zen-kernel 5.13/futex2
        git checkout 2568c65603cd0168a29fdf4564d80e447117916a
        # save the attached .config to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross O=build_dir ARCH=microblaze SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   microblaze-linux-ld: kernel/fork.o: in function `mm_release':
>> kernel/fork.o:(.text+0x8dc): undefined reference to `ksys_futex_wake'

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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