[iommu:arm/qcom 3/5] include/linux/atomic.h:475:29: error: implicit declaration of function 'cmpxchg64'

[iommu:arm/qcom 3/5] include/linux/atomic.h:475:29: error: implicit declaration of function 'cmpxchg64'

[kbuild test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu.git arm/qcom
head:   d43ecff3efbe0dcff4c239a65b17e68134388ed6
commit: 0ae349a0f33fb040a2bc228fdc6d60111455feab [3/5] iommu/qcom: Add qcom_iommu
config: mn10300-allyesconfig (attached as .config)
compiler: am33_2.0-linux-gcc (GCC) 6.2.0
reproduce:
        wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 0ae349a0f33fb040a2bc228fdc6d60111455feab
        # save the attached .config to linux build tree
        make.cross ARCH=mn10300 

All errors (new ones prefixed by >>):

   In file included from drivers//iommu/io-pgtable-arm.c:23:0:
   drivers//iommu/io-pgtable-arm.c: In function 'arm_lpae_install_table':
>> include/linux/atomic.h:475:29: error: implicit declaration of function 'cmpxchg64' [-Werror=implicit-function-declaration]
    #define  cmpxchg64_relaxed  cmpxchg64
                                ^
   drivers//iommu/io-pgtable-arm.c:341:8: note: in expansion of macro 'cmpxchg64_relaxed'
     old = cmpxchg64_relaxed(ptep, curr, new);
           ^~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors
--
   In file included from drivers/iommu/io-pgtable-arm.c:23:0:
   drivers/iommu/io-pgtable-arm.c: In function 'arm_lpae_install_table':
>> include/linux/atomic.h:475:29: error: implicit declaration of function 'cmpxchg64' [-Werror=implicit-function-declaration]
    #define  cmpxchg64_relaxed  cmpxchg64
                                ^
   drivers/iommu/io-pgtable-arm.c:341:8: note: in expansion of macro 'cmpxchg64_relaxed'
     old = cmpxchg64_relaxed(ptep, curr, new);
           ^~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/cmpxchg64 +475 include/linux/atomic.h

654672d4 Will Deacon 2015-08-06  472  
654672d4 Will Deacon 2015-08-06  473  /* cmpxchg64_relaxed */
654672d4 Will Deacon 2015-08-06  474  #ifndef cmpxchg64_relaxed
654672d4 Will Deacon 2015-08-06 @475  #define  cmpxchg64_relaxed		cmpxchg64
654672d4 Will Deacon 2015-08-06  476  #define  cmpxchg64_acquire		cmpxchg64
654672d4 Will Deacon 2015-08-06  477  #define  cmpxchg64_release		cmpxchg64
654672d4 Will Deacon 2015-08-06  478  

:::::: The code at line 475 was first introduced by commit
:::::: 654672d4ba1a6001c365833be895f9477c4d5eab locking/atomics: Add _{acquire|release|relaxed}() variants of some atomic operations

:::::: TO: Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org>
:::::: CC: Ingo Molnar <mingo-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>

---
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