[rcu:from-joel.2019.08.16a 143/172] tree.c:undefined reference to `__bad_xchg'

[kbuild test robot]

tree:   https://kernel.googlesource.com/pub/scm/linux/kernel/git/paulmck/linux-rcu.git from-joel.2019.08.16a
head:   01b0e4d3e0ac279b295bc06a3591f0b810b9908f
commit: bda80ba9decc7a32413e88d2f070de180c4b76ab [143/172] rcu/tree: Add basic support for kfree_rcu() batching
config: arm-allmodconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (GCC) 7.4.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout bda80ba9decc7a32413e88d2f070de180c4b76ab
        # save the attached .config to linux build tree
        GCC_VERSION=7.4.0 make.cross ARCH=arm 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

   kernel/rcu/tree.o: In function `kfree_rcu_monitor':
>> tree.c:(.text+0x27d8): undefined reference to `__bad_xchg'
   kernel/rcu/tree.o: In function `kfree_call_rcu':
   tree.c:(.text+0xac70): undefined reference to `__bad_xchg'

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0-DAY kernel test infrastructure                Open Source Technology Center
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