tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 92d00774360dfd4151f15ab9905c643347b9f242 commit: 05ce9d20d699b093dec985192a7db63b48f26ca2 [5832/6533] iommu/dart: Add DART iommu driver config: arc-allyesconfig (attached as .config) compiler: arceb-elf-gcc (GCC) 10.3.0 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://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commi... git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout 05ce9d20d699b093dec985192a7db63b48f26ca2 # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross O=build_dir ARCH=arc SHELL=/bin/bash If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; Note: the linux-next/master HEAD 92d00774360dfd4151f15ab9905c643347b9f242 builds fine. It may have been fixed somewhere. All errors (new ones prefixed by >>): drivers/iommu/apple-dart.c: In function 'apple_dart_map_pages': 380 | return ops->map_pages(ops, iova, paddr, pgsize, pgcount, prot, gfp, | ^~ drivers/iommu/apple-dart.c: In function 'apple_dart_unmap_pages': 392 | return ops->unmap_pages(ops, iova, pgsize, pgcount, gather); | ^~ drivers/iommu/apple-dart.c: At top level: 729 | .map_pages = apple_dart_map_pages, | ^~~~~~~~~ 729 | .map_pages = apple_dart_map_pages, | ^~~~~~~~~~~~~~~~~~~~ drivers/iommu/apple-dart.c:729:15: note: (near initialization for 'apple_dart_iommu_ops.map') 730 | .unmap_pages = apple_dart_unmap_pages, | ^~~~~~~~~~~ 730 | .unmap_pages = apple_dart_unmap_pages, | ^~~~~~~~~~~~~~~~~~~~~~ drivers/iommu/apple-dart.c:730:17: note: (near initialization for 'apple_dart_iommu_ops.unmap') drivers/iommu/apple-dart.c: In function 'apple_dart_unmap_pages': drivers/iommu/apple-dart.c:393:1: error: control reaches end of non-void function [-Werror=return-type] 393 | } | ^ drivers/iommu/apple-dart.c: In function 'apple_dart_map_pages': drivers/iommu/apple-dart.c:382:1: error: control reaches end of non-void function [-Werror=return-type] 382 | } | ^ cc1: some warnings being treated as errors vim +380 drivers/iommu/apple-dart.c 368 369 static int apple_dart_map_pages(struct iommu_domain *domain, unsigned long iova, 370 phys_addr_t paddr, size_t pgsize, 371 size_t pgcount, int prot, gfp_t gfp, 372 size_t *mapped) 373 { 374 struct apple_dart_domain *dart_domain = to_dart_domain(domain); 375 struct io_pgtable_ops *ops = dart_domain->pgtbl_ops; 376 377 if (!ops) 378 return -ENODEV; 379 381 mapped); 382 } 383 384 static size_t apple_dart_unmap_pages(struct iommu_domain *domain, 385 unsigned long iova, size_t pgsize, 386 size_t pgcount, 387 struct iommu_iotlb_gather *gather) 388 { 389 struct apple_dart_domain *dart_domain = to_dart_domain(domain); 390 struct io_pgtable_ops *ops = dart_domain->pgtbl_ops; 391 393 } 394 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org