[rcu:rcu/dev 111/113] drivers//iommu/amd_iommu.c:3566:22: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'stupid_workaround'

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git 
rcu/dev
head:   e4cd9c98498575e44585e74bf2cf1b45bc42a697
commit: 7d9ca00a259aa549acd99ba91d634c62430a94ea [111/113] EXP iommu: 
Placeholder for fix in mainline
config: x86_64-allmodconfig (attached as .config)
compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
reproduce:
        git checkout 7d9ca00a259aa549acd99ba91d634c62430a94ea
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

>> drivers//iommu/amd_iommu.c:3566:22: error: expected '=', ',', ';', 'asm' or 
>> '__attribute__' before 'stupid_workaround'
    void __maxybe_unused stupid_workaround(void)
                         ^~~~~~~~~~~~~~~~~

vim +3566 drivers//iommu/amd_iommu.c

  3565  
> 3566  void __maxybe_unused stupid_workaround(void)
  3567  {
  3568          spin_lock(&iommu_table_lock);
  3569          spin_unlock(&iommu_table_lock);
  3570  }
  3571  

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.config.gz
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