[kbuild-all] arch/powerpc/kernel/iommu.c:1055:13: sparse: sparse: function 'iommu_tce_xchg_no_kill' with external linkage has definition

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 42eb8fdac2fc5d62392dcfcf0253753e821a97b0 commit: 179209fa12709a3df8888c323b37315da2683c24 vfio: IOMMU_API should be selected date: 8 months ago config: powerpc64-randconfig-s032-20211118 (attached as .config) compiler: powerpc64-linux-gcc (GCC) 11.2.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.4-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 179209fa12709a3df8888c323b37315da2683c24 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=powerpc SHELL=/bin/bash arch/powerpc/ drivers/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) arch/powerpc/kernel/iommu.c:1098:9: sparse: sparse: context imbalance in 'iommu_take_ownership' - different lock contexts for basic block arch/powerpc/kernel/iommu.c:1126:9: sparse: sparse: context imbalance in 'iommu_release_ownership' - different lock contexts for basic block vim +/iommu_tce_xchg_no_kill +1055 arch/powerpc/kernel/iommu.c 4e13c1ac6baa1d Alexey Kardashevskiy 2013-05-21 1054 35872480da47ec Alexey Kardashevskiy 2019-08-29 @1055 extern long iommu_tce_xchg_no_kill(struct mm_struct *mm, 35872480da47ec Alexey Kardashevskiy 2019-08-29 1056 struct iommu_table *tbl, c10c21efa4bcca Alexey Kardashevskiy 2018-12-19 1057 unsigned long entry, unsigned long *hpa, c10c21efa4bcca Alexey Kardashevskiy 2018-12-19 1058 enum dma_data_direction *direction) 4e13c1ac6baa1d Alexey Kardashevskiy 2013-05-21 1059 { 05c6cfb9dce0d1 Alexey Kardashevskiy 2015-06-05 1060 long ret; c10c21efa4bcca Alexey Kardashevskiy 2018-12-19 1061 unsigned long size = 0; 4e13c1ac6baa1d Alexey Kardashevskiy 2013-05-21 1062 35872480da47ec Alexey Kardashevskiy 2019-08-29 1063 ret = tbl->it_ops->xchg_no_kill(tbl, entry, hpa, direction, false); 05c6cfb9dce0d1 Alexey Kardashevskiy 2015-06-05 1064 if (!ret && ((*direction == DMA_FROM_DEVICE) || c10c21efa4bcca Alexey Kardashevskiy 2018-12-19 1065 (*direction == DMA_BIDIRECTIONAL)) && c10c21efa4bcca Alexey Kardashevskiy 2018-12-19 1066 !mm_iommu_is_devmem(mm, *hpa, tbl->it_page_shift, c10c21efa4bcca Alexey Kardashevskiy 2018-12-19 1067 &size)) 05c6cfb9dce0d1 Alexey Kardashevskiy 2015-06-05 1068 SetPageDirty(pfn_to_page(*hpa >> PAGE_SHIFT)); 4e13c1ac6baa1d Alexey Kardashevskiy 2013-05-21 1069 4e13c1ac6baa1d Alexey Kardashevskiy 2013-05-21 1070 return ret; 4e13c1ac6baa1d Alexey Kardashevskiy 2013-05-21 1071 } 35872480da47ec Alexey Kardashevskiy 2019-08-29 1072 EXPORT_SYMBOL_GPL(iommu_tce_xchg_no_kill); 35872480da47ec Alexey Kardashevskiy 2019-08-29 1073 :::::: The code at line 1055 was first introduced by commit :::::: 35872480da47ec714fd9c4f2f3d2d83daf304851 powerpc/powernv/ioda: Split out TCE invalidation from TCE updates :::::: TO: Alexey Kardashevskiy <aik(a)ozlabs.ru&gt; :::::: CC: Michael Ellerman <mpe(a)ellerman.id.au&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org