tree:   https://github.com/tobetter/linux odroid-5.13.y
head:   9adf6ead45ffd1911742d32baf84fa1b4eac04e3
commit: 4c6761c55d4f15337b88e29cb05834a753ddc506 [41/93] ODROID-XU4: char: exynos: add /dev/gpiomem device for rootless user GPIO access
config: um-x86_64_defconfig (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/tobetter/linux/commit/4c6761c55d4f15337b88e29cb05834a753ddc506
        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
        make W=1 ARCH=um SUBARCH=x86_64

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   drivers/char/exynos-gpiomem.c: In function 'exynos_gpiomem_mmap':
>> drivers/char/exynos-gpiomem.c:121:22: error: implicit declaration of function 'phys_mem_access_prot'; did you mean 'phys_mem_access_prot_allowed'? [-Werror=implicit-function-declaration]
     121 |  vma->vm_page_prot = phys_mem_access_prot(file, vma->vm_pgoff,
         |                      ^~~~~~~~~~~~~~~~~~~~
         |                      phys_mem_access_prot_allowed
>> drivers/char/exynos-gpiomem.c:121:22: error: incompatible types when assigning to type 'pgprot_t' {aka 'struct <anonymous>'} from type 'int'
   cc1: some warnings being treated as errors


vim +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:
 > 121		vma->vm_page_prot = phys_mem_access_prot(file, vma->vm_pgoff,
   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(a)lists.01.org