tree: https://chromium.googlesource.com/chromiumos/third_party/kernel chromeos-4.4 head: 6d5e8cb22c2a82dde051b99b44498bbc350c7130 commit: b21837b752bb13dbd2c2da17377c23f2e3cea264 [10/11] CHROMIUM: drm/evdi: Create sysfs link from evdi to its parent device and unlink on detach config: xtensa-allyesconfig (attached as .config) compiler: xtensa-linux-gcc (GCC) 7.5.0 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 git remote add chrome-os https://chromium.googlesource.com/chromiumos/third_party/kernel git fetch --no-tags chrome-os chromeos-4.4 git checkout b21837b752bb13dbd2c2da17377c23f2e3cea264 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-7.5.0 make.cross ARCH=xtensa If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): cc1: warning: include/drm: No such file or directory [-Wmissing-include-dirs] In file included from include/uapi/linux/stddef.h:1:0, from include/linux/stddef.h:4, from include/uapi/linux/posix_types.h:4, from include/uapi/linux/types.h:13, from include/linux/types.h:5, from include/linux/list.h:4, from include/linux/agp_backend.h:33, from include/drm/drmP.h:35, from drivers/gpu/drm/evdi/evdi_drv.c:10: include/linux/scatterlist.h: In function 'sg_set_buf': arch/xtensa/include/asm/page.h:175:9: warning: comparison of unsigned expression >= 0 is always true [-Wtype-limits] ((pfn) >= ARCH_PFN_OFFSET && ((pfn) - ARCH_PFN_OFFSET) < max_mapnr) ^ include/linux/compiler.h:182:42: note: in definition of macro 'unlikely' # define unlikely(x) __builtin_expect(!!(x), 0) ^ include/linux/scatterlist.h:140:2: note: in expansion of macro 'BUG_ON' BUG_ON(!virt_addr_valid(buf)); ^~~~~~ arch/xtensa/include/asm/page.h:183:32: note: in expansion of macro 'pfn_valid' #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) ^~~~~~~~~ include/linux/scatterlist.h:140:10: note: in expansion of macro 'virt_addr_valid' BUG_ON(!virt_addr_valid(buf)); ^~~~~~~~~~~~~~~ In file included from drivers/gpu/drm/evdi/evdi_drv.h:23:0, from drivers/gpu/drm/evdi/evdi_drv.c:17: include/linux/reservation.h: In function 'reservation_object_fini': include/linux/reservation.h:122:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < fobj->shared_count; ++i) ^ drivers/gpu/drm/evdi/evdi_drv.c: At top level: drivers/gpu/drm/evdi/evdi_drv.c:81:6: warning: no previous prototype for 'evdi_platform_device_is_free' [-Wmissing-prototypes] bool evdi_platform_device_is_free(struct platform_device *pdev) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ void evdi_platform_device_link(struct platform_device *pdev, ^~~~~~~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/evdi/evdi_drv.c: In function 'add_device_with_usb_path': drivers/gpu/drm/evdi/evdi_drv.c:367:8: warning: variable 'itf_token' set but not used [-Wunused-but-set-variable] char *itf_token = NULL; ^~~~~~~~~ drivers/gpu/drm/evdi/evdi_drv.c: In function 'evdi_init': drivers/gpu/drm/evdi/evdi_drv.c:555:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < ARRAY_SIZE(evdi_device_attributes); i++) { ^ drivers/gpu/drm/evdi/evdi_drv.c: In function 'evdi_exit': drivers/gpu/drm/evdi/evdi_drv.c:574:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < ARRAY_SIZE(evdi_device_attributes); i++) { ^ vim +/evdi_platform_device_link +93 drivers/gpu/drm/evdi/evdi_drv.c 92 94 struct device *parent) 95 { 96 struct evdi_platform_device_data *data = NULL; 97 int ret = 0; 98 99 if (!parent || !pdev) 100 return; 101 102 data = (struct evdi_platform_device_data *)platform_get_drvdata(pdev); 103 if (!evdi_platform_device_is_free(pdev)) { 104 EVDI_FATAL("Device is already attached can't symlink again\n"); 105 return; 106 } 107 108 ret = sysfs_create_link(&pdev->dev.kobj, &parent->kobj, "device"); 109 if (ret) { 110 EVDI_FATAL("Failed to create sysfs link to parent device\n"); 111 } else { 112 data->symlinked = true; 113 data->parent = parent; 114 } 115 } 116 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org