Hi Rob, I love your patch! Perhaps something to improve:
[auto build test WARNING on linus/master] [also build test WARNING on v5.19-rc8] [cannot apply to drm-misc/drm-misc-next drm/drm-next drm-exynos/exynos-drm-next drm-intel/for-linux-next drm-tip/drm-tip next-20220728] [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#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Rob-Clark/dma-buf-map-info-support/20220730-010844 base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 6e2c0490769ef8a95b61304389116ccc85c53e12 config: arc-randconfig-r043-20220729 (https://download.01.org/0day-ci/archive/20220730/202207300546.hb4u217w-...@intel.com/config) compiler: arceb-elf-gcc (GCC) 12.1.0 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://github.com/intel-lab-lkp/linux/commit/203f14a73a179d6c5fbfa4813e45fde2a9ae9860 git remote add linux-review https://github.com/intel-lab-lkp/linux git fetch --no-tags linux-review Rob-Clark/dma-buf-map-info-support/20220730-010844 git checkout 203f14a73a179d6c5fbfa4813e45fde2a9ae9860 # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arc SHELL=/bin/bash drivers/dma-buf/ If you fix the issue, kindly add following tag where applicable Reported-by: kernel test robot <l...@intel.com> All warnings (new ones prefixed by >>): drivers/dma-buf/dma-buf.c: In function 'dma_buf_info': >> drivers/dma-buf/dma-buf.c:346:26: warning: passing argument 1 of >> 'copy_to_user' discards 'const' qualifier from pointer target type >> [-Wdiscarded-qualifiers] 346 | if (copy_to_user(uarg, &arg, sizeof(arg))) | ^~~~ In file included from include/linux/sched/task.h:11, from include/linux/sched/signal.h:9, from include/linux/rcuwait.h:6, from include/linux/percpu-rwsem.h:7, from include/linux/fs.h:33, from drivers/dma-buf/dma-buf.c:14: include/linux/uaccess.h:157:27: note: expected 'void *' but argument is of type 'const void *' 157 | copy_to_user(void __user *to, const void *from, unsigned long n) | ~~~~~~~~~~~~~^~ vim +346 drivers/dma-buf/dma-buf.c 328 329 static long dma_buf_info(struct dma_buf *dmabuf, const void __user *uarg) 330 { 331 struct dma_buf_info arg; 332 333 if (copy_from_user(&arg, uarg, sizeof(arg))) 334 return -EFAULT; 335 336 switch (arg.param) { 337 case DMA_BUF_INFO_VM_PROT: 338 if (!dmabuf->ops->mmap_info) 339 return -ENOSYS; 340 arg.value = dmabuf->ops->mmap_info(dmabuf); 341 break; 342 default: 343 return -EINVAL; 344 } 345 > 346 if (copy_to_user(uarg, &arg, sizeof(arg))) 347 return -EFAULT; 348 349 return 0; 350 } 351 -- 0-DAY CI Kernel Test Service https://01.org/lkp
