Hi Robin, I love your patch! Yet something to improve: [auto build test ERROR on iommu/next] [also build test ERROR on rockchip/for-next sunxi/sunxi/for-next linus/master v5.14-rc4 next-20210804] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Robin-Murphy/iommu-Refactor-DMA-domain-strictness/20210805-011913 base: https://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu.git next config: x86_64-allyesconfig (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://github.com/0day-ci/linux/commit/33b83e4adc16220361ed42c229e8cd37f8a2a3aa git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Robin-Murphy/iommu-Refactor-DMA-domain-strictness/20210805-011913 git checkout 33b83e4adc16220361ed42c229e8cd37f8a2a3aa # save the attached .config to linux build tree make W=1 ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot All errors (new ones prefixed by >>): drivers/iommu/amd/iommu.c: In function 'amd_iommu_probe_finalize': >> drivers/iommu/amd/iommu.c:1757:3: error: implicit declaration of function 'iommu_setup_dma_ops'; did you mean 'arch_setup_dma_ops'? [-Werror=implicit-function-declaration] 1757 | iommu_setup_dma_ops(dev, 0, U64_MAX); | ^~~~~~~~~~~~~~~~~~~ | arch_setup_dma_ops cc1: some warnings being treated as errors vim +1757 drivers/iommu/amd/iommu.c 1ac4cbbc5eb56d arch/x86/kernel/amd_iommu.c Joerg Roedel 2008-12-10 1749 dce8d6964ebdb3 drivers/iommu/amd_iommu.c Joerg Roedel 2020-04-29 1750 static void amd_iommu_probe_finalize(struct device *dev) dce8d6964ebdb3 drivers/iommu/amd_iommu.c Joerg Roedel 2020-04-29 1751 { dce8d6964ebdb3 drivers/iommu/amd_iommu.c Joerg Roedel 2020-04-29 1752 struct iommu_domain *domain; ac1534a55d1e87 drivers/iommu/amd_iommu.c Joerg Roedel 2012-06-21 1753 07ee86948c9111 drivers/iommu/amd_iommu.c Joerg Roedel 2015-05-28 1754 /* Domains are initialized for this device - have a look what we ended up with */ 07ee86948c9111 drivers/iommu/amd_iommu.c Joerg Roedel 2015-05-28 1755 domain = iommu_get_domain_for_dev(dev); 57f9842e488406 drivers/iommu/amd_iommu.c Joerg Roedel 2020-04-29 1756 if (domain->type == IOMMU_DOMAIN_DMA) ac6d704679d343 drivers/iommu/amd/iommu.c Jean-Philippe Brucker 2021-06-18 @1757 iommu_setup_dma_ops(dev, 0, U64_MAX); d6177a6556f853 drivers/iommu/amd/iommu.c Jean-Philippe Brucker 2021-04-22 1758 else d6177a6556f853 drivers/iommu/amd/iommu.c Jean-Philippe Brucker 2021-04-22 1759 set_dma_ops(dev, NULL); e275a2a0fc9e21 arch/x86/kernel/amd_iommu.c Joerg Roedel 2008-12-10 1760 } e275a2a0fc9e21 arch/x86/kernel/amd_iommu.c Joerg Roedel 2008-12-10 1761 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org