Hi "Thomas, I love your patch! Yet something to improve: [auto build test ERROR on linus/master] [cannot apply to v5.4-rc3 next-20191014] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Thomas-Hellstr-m-VMware/Emulated... config: x86_64-rhel (attached as .config) compiler: gcc-7 (Debian 7.4.0-13) 7.4.0 reproduce: # save the attached .config to linux build tree make ARCH=x86_64 If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): drivers/gpu/drm/vmwgfx/vmwgfx_ttm_glue.c: In function 'vmw_mmap': .open = ttm_bo_vm_open, ^~~~~~~~~~~~~~ ttm_bo_mem_put drivers/gpu/drm/vmwgfx/vmwgfx_ttm_glue.c:36:11: note: each undeclared identifier is reported only once for each function it appears in .close = ttm_bo_vm_close ^~~~~~~~~~~~~~~ ttm_bo_vm_open -- drivers/gpu/drm/vmwgfx/vmwgfx_page_dirty.c: In function 'vmw_bo_vm_mkwrite': ret = ttm_bo_vm_reserve(bo, vmf); ^~~~~~~~~~~~~~~~~ ttm_bo_unreserve drivers/gpu/drm/vmwgfx/vmwgfx_page_dirty.c: In function 'vmw_bo_vm_fault': TTM_BO_VM_NUM_PREFAULT; ^~~~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/vmwgfx/vmwgfx_page_dirty.c:414:3: note: each undeclared identifier is reported only once for each function it appears in ret = ttm_bo_vm_fault_reserved(vmf, prot, num_prefault); ^~~~~~~~~~~~~~~~~~~~~~~~ ttm_bo_init_reserved cc1: some warnings being treated as errors vim +36 drivers/gpu/drm/vmwgfx/vmwgfx_ttm_glue.c 29 30 int vmw_mmap(struct file *filp, struct vm_area_struct *vma) 31 { 32 static const struct vm_operations_struct vmw_vm_ops = { 33 .pfn_mkwrite = vmw_bo_vm_mkwrite, 34 .page_mkwrite = vmw_bo_vm_mkwrite, 35 .fault = vmw_bo_vm_fault, 38 }; 39 struct drm_file *file_priv = filp->private_data; 40 struct vmw_private *dev_priv = vmw_priv(file_priv->minor->dev); 41 int ret = ttm_bo_mmap(filp, vma, &dev_priv->bdev); 42 43 if (ret) 44 return ret; 45 46 vma->vm_ops = &vmw_vm_ops; 47 48 return 0; 49 } 50 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation