Hi Christoph, I love your patch! Yet something to improve: [auto build test ERROR on next-20200707] [cannot apply to powerpc/next hp-parisc/for-next s390/features sparc-next/master sparc/master tip/x86/core iommu/next char-misc/char-misc-testing linus/master ia64/next v5.8-rc4 v5.8-rc3 v5.8-rc2 v5.8-rc4] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Christoph-Hellwig/dma-mapping-mo... base: 5b2a702f85b3285fcde0309aadacc13a36c70fc7 config: x86_64-randconfig-r004-20200709 (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 02946de3802d3bc65bc9f2eb9b8d4969b5a7add8) 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 # install x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All error/warnings (new ones prefixed by >>): vdev->dev.dma_ops = dma_ops; ~~~~~~~~~ ^ dma_set_mask(&vdev->dev, DMA_BIT_MASK(64)); ^~~~~~~~~~~~~~~~ include/linux/dma-mapping.h:139:54: note: expanded from macro 'DMA_BIT_MASK' #define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1)) ^ ~~~ 1 warning and 1 error generated. vim +148 drivers/misc/mic/bus/vop_bus.c a19ddd6fd260d6 Sudeep Dutt 2016-02-08 131 a19ddd6fd260d6 Sudeep Dutt 2016-02-08 132 struct vop_device * a19ddd6fd260d6 Sudeep Dutt 2016-02-08 133 vop_register_device(struct device *pdev, int id, a19ddd6fd260d6 Sudeep Dutt 2016-02-08 134 const struct dma_map_ops *dma_ops, a19ddd6fd260d6 Sudeep Dutt 2016-02-08 135 struct vop_hw_ops *hw_ops, u8 dnode, struct mic_mw *aper, a19ddd6fd260d6 Sudeep Dutt 2016-02-08 136 struct dma_chan *chan) a19ddd6fd260d6 Sudeep Dutt 2016-02-08 137 { a19ddd6fd260d6 Sudeep Dutt 2016-02-08 138 int ret; a19ddd6fd260d6 Sudeep Dutt 2016-02-08 139 struct vop_device *vdev; a19ddd6fd260d6 Sudeep Dutt 2016-02-08 140 a19ddd6fd260d6 Sudeep Dutt 2016-02-08 141 vdev = kzalloc(sizeof(*vdev), GFP_KERNEL); a19ddd6fd260d6 Sudeep Dutt 2016-02-08 142 if (!vdev) a19ddd6fd260d6 Sudeep Dutt 2016-02-08 143 return ERR_PTR(-ENOMEM); a19ddd6fd260d6 Sudeep Dutt 2016-02-08 144 a19ddd6fd260d6 Sudeep Dutt 2016-02-08 145 vdev->dev.parent = pdev; a19ddd6fd260d6 Sudeep Dutt 2016-02-08 146 vdev->id.device = id; a19ddd6fd260d6 Sudeep Dutt 2016-02-08 147 vdev->id.vendor = VOP_DEV_ANY_ID; 5657933dbb6e25 Bart Van Assche 2017-01-20 @148 vdev->dev.dma_ops = dma_ops; a19ddd6fd260d6 Sudeep Dutt 2016-02-08 149 vdev->dev.dma_mask = &vdev->dev.coherent_dma_mask; a19ddd6fd260d6 Sudeep Dutt 2016-02-08 @150 dma_set_mask(&vdev->dev, DMA_BIT_MASK(64)); a19ddd6fd260d6 Sudeep Dutt 2016-02-08 151 vdev->dev.release = vop_release_dev; a19ddd6fd260d6 Sudeep Dutt 2016-02-08 152 vdev->hw_ops = hw_ops; a19ddd6fd260d6 Sudeep Dutt 2016-02-08 153 vdev->dev.bus = &vop_bus; a19ddd6fd260d6 Sudeep Dutt 2016-02-08 154 vdev->dnode = dnode; a19ddd6fd260d6 Sudeep Dutt 2016-02-08 155 vdev->aper = aper; a19ddd6fd260d6 Sudeep Dutt 2016-02-08 156 vdev->dma_ch = chan; a19ddd6fd260d6 Sudeep Dutt 2016-02-08 157 vdev->index = dnode - 1; a19ddd6fd260d6 Sudeep Dutt 2016-02-08 158 dev_set_name(&vdev->dev, "vop-dev%u", vdev->index); a19ddd6fd260d6 Sudeep Dutt 2016-02-08 159 /* a19ddd6fd260d6 Sudeep Dutt 2016-02-08 160 * device_register() causes the bus infrastructure to look for a a19ddd6fd260d6 Sudeep Dutt 2016-02-08 161 * matching driver. a19ddd6fd260d6 Sudeep Dutt 2016-02-08 162 */ a19ddd6fd260d6 Sudeep Dutt 2016-02-08 163 ret = device_register(&vdev->dev); a19ddd6fd260d6 Sudeep Dutt 2016-02-08 164 if (ret) a19ddd6fd260d6 Sudeep Dutt 2016-02-08 165 goto free_vdev; a19ddd6fd260d6 Sudeep Dutt 2016-02-08 166 return vdev; a19ddd6fd260d6 Sudeep Dutt 2016-02-08 167 free_vdev: 5fbe9f35dfcd83 Arvind Yadav 2018-03-12 168 put_device(&vdev->dev); a19ddd6fd260d6 Sudeep Dutt 2016-02-08 169 return ERR_PTR(ret); a19ddd6fd260d6 Sudeep Dutt 2016-02-08 170 } a19ddd6fd260d6 Sudeep Dutt 2016-02-08 171 EXPORT_SYMBOL_GPL(vop_register_device); a19ddd6fd260d6 Sudeep Dutt 2016-02-08 172 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org