Hi Alex, I love your patch! Perhaps something to improve: [auto build test WARNING on vfio/next] [also build test WARNING on next-20210211] [cannot apply to v5.11-rc7] [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/Alex-Williamson/vfio-Device-memory-DMA-mapping-improvements/20210213-033317 base: https://github.com/awilliam/linux-vfio.git next config: arm-randconfig-r032-20210212 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project c9439ca36342fb6013187d0a69aef92736951476) 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 arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi # https://github.com/0day-ci/linux/commit/f983107aef5b1386ae601ee8573da872f1484633 git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Alex-Williamson/vfio-Device-memory-DMA-mapping-improvements/20210213-033317 git checkout f983107aef5b1386ae601ee8573da872f1484633 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): >> drivers/vfio/vfio_iommu_type1.c:509:18: warning: no previous prototype for function 'pfnmap_find_dma' [-Wmissing-prototypes] struct vfio_dma *pfnmap_find_dma(struct pfnmap_obj *pfnmap) ^ drivers/vfio/vfio_iommu_type1.c:509:1: note: declare 'static' if the function is not intended to be used outside of this translation unit struct vfio_dma *pfnmap_find_dma(struct pfnmap_obj *pfnmap) ^ static 1 warning generated. vim +/pfnmap_find_dma +509 drivers/vfio/vfio_iommu_type1.c 508 > 509 struct vfio_dma *pfnmap_find_dma(struct pfnmap_obj *pfnmap) 510 { 511 struct rb_node *n; 512 513 for (n = rb_first(&pfnmap->iommu->dma_list); n; n = rb_next(n)) { 514 struct vfio_dma *dma = rb_entry(n, struct vfio_dma, node); 515 516 if (dma->pfnmap == pfnmap) 517 return dma; 518 } 519 520 return NULL; 521 } 522 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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