tree: https://github.com/tobetter/linux odroid-5.13.y head: ec41beb389cd0d7ab68345d550334d44842a2cb1 commit: 4c6761c55d4f15337b88e29cb05834a753ddc506 [41/93] ODROID-XU4: char: exynos: add /dev/gpiomem device for rootless user GPIO access config: arm-randconfig-r034-20210617 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 64720f57bea6a6bf033feef4a5751ab9c0c3b401) 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/tobetter/linux/commit/4c6761c55d4f15337b88e29cb05834a7... git remote add tobetter-linux https://github.com/tobetter/linux git fetch --no-tags tobetter-linux odroid-5.13.y git checkout 4c6761c55d4f15337b88e29cb05834a753ddc506 # 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(a)intel.com&gt; All errors (new ones prefixed by >>): vma->vm_page_prot = phys_mem_access_prot(file, vma->vm_pgoff, ^ 1 error generated. vim +/phys_mem_access_prot +121 drivers/char/exynos-gpiomem.c 106 107 static int exynos_gpiomem_mmap(struct file *file, struct vm_area_struct *vma) 108 { 109 int gpio_area = 0; 110 111 while (gpio_area < inst->gpio_area_count) { 112 if ((inst->gpio_regs_phys[gpio_area] >> PAGE_SHIFT) == vma->vm_pgoff) 113 goto found; 114 115 gpio_area++; 116 } 117 118 return -EACCES; 119 120 found: 122 PAGE_SIZE, 123 vma->vm_page_prot); 124 125 vma->vm_ops = &exynos_gpiomem_vm_ops; 126 127 if (remap_pfn_range(vma, vma->vm_start, 128 vma->vm_pgoff, 129 PAGE_SIZE, 130 vma->vm_page_prot)) { 131 return -EAGAIN; 132 } 133 134 return 0; 135 } 136 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org