Hi Sakari, I love your patch! Perhaps something to improve: [auto build test WARNING on linuxtv-media/master] [also build test WARNING on next-20210212] [cannot apply to v5.11] [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] url: https://github.com/0day-ci/linux/commits/Sakari-Ailus/v4l-async-Fix-kerne... base: git://linuxtv.org/media_tree.git master config: sparc-allyesconfig (attached as .config) compiler: sparc64-linux-gcc (GCC) 9.3.0 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/0day-ci/linux/commit/8e8c47cba531c1706847f07a4af5cd19a... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Sakari-Ailus/v4l-async-Fix-kerneldoc-documentation-for-async-functions/20210215-204146 git checkout 8e8c47cba531c1706847f07a4af5cd19aa33f351 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=sparc 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 >>): In file included from drivers/media/platform/ti-vpe/cal.c:24: drivers/media/platform/ti-vpe/cal.c: In function 'cal_async_notifier_register': include/media/v4l2-async.h:179:4: error: '__type' undeclared (first use in this function); did you mean '_ctype'? 179 | ((__type *)__v4l2_async_notifier_add_fwnode_subdev(notifier, fwnode, \ | ^~~~~~ drivers/media/platform/ti-vpe/cal.c:694:10: note: in expansion of macro 'v4l2_async_notifier_add_fwnode_subdev' 694 | casd = v4l2_async_notifier_add_fwnode_subdev(&cal->notifier, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/media/v4l2-async.h:179:4: note: each undeclared identifier is reported only once for each function it appears in 179 | ((__type *)__v4l2_async_notifier_add_fwnode_subdev(notifier, fwnode, \ | ^~~~~~ drivers/media/platform/ti-vpe/cal.c:694:10: note: in expansion of macro 'v4l2_async_notifier_add_fwnode_subdev' 694 | casd = v4l2_async_notifier_add_fwnode_subdev(&cal->notifier, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/media/v4l2-async.h:179:12: error: expected expression before ')' token 179 | ((__type *)__v4l2_async_notifier_add_fwnode_subdev(notifier, fwnode, \ | ^ drivers/media/platform/ti-vpe/cal.c:694:10: note: in expansion of macro 'v4l2_async_notifier_add_fwnode_subdev' 694 | casd = v4l2_async_notifier_add_fwnode_subdev(&cal->notifier, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 688 | struct fwnode_handle *fwnode; | ^~~~~~ vim +/fwnode +688 drivers/media/platform/ti-vpe/cal.c b6ee3f0dcf43dc Laurent Pinchart 2017-08-30 676 a539a0536f6e22 Laurent Pinchart 2020-07-06 677 static int cal_async_notifier_register(struct cal_dev *cal) 343e89a792a571 Benoit Parrot 2016-01-06 678 { a539a0536f6e22 Laurent Pinchart 2020-07-06 679 unsigned int i; a539a0536f6e22 Laurent Pinchart 2020-07-06 680 int ret; a539a0536f6e22 Laurent Pinchart 2020-07-06 681 a539a0536f6e22 Laurent Pinchart 2020-07-06 682 v4l2_async_notifier_init(&cal->notifier); a539a0536f6e22 Laurent Pinchart 2020-07-06 683 cal->notifier.ops = &cal_async_notifier_ops; a539a0536f6e22 Laurent Pinchart 2020-07-06 684 71c1f16ddd528d Laurent Pinchart 2020-12-07 685 for (i = 0; i < cal->data->num_csi2_phy; ++i) { 539e7c5d7c0281 Laurent Pinchart 2020-07-06 686 struct cal_camerarx *phy = cal->phy[i]; 8fcb7576ad197b Laurent Pinchart 2020-07-06 687 struct cal_v4l2_async_subdev *casd; f5ddf19eca3328 Laurent Pinchart 2020-07-06 @688 struct fwnode_handle *fwnode; 343e89a792a571 Benoit Parrot 2016-01-06 689 71c1f16ddd528d Laurent Pinchart 2020-12-07 690 if (!phy->sensor_node) a539a0536f6e22 Laurent Pinchart 2020-07-06 691 continue; d079f94c90469f Steve Longerbeam 2018-09-29 692 539e7c5d7c0281 Laurent Pinchart 2020-07-06 693 fwnode = of_fwnode_handle(phy->sensor_node); b01edcbd409cf7 Laurent Pinchart 2021-01-18 694 casd = v4l2_async_notifier_add_fwnode_subdev(&cal->notifier, a539a0536f6e22 Laurent Pinchart 2020-07-06 695 fwnode, b01edcbd409cf7 Laurent Pinchart 2021-01-18 696 struct cal_v4l2_async_subdev); b01edcbd409cf7 Laurent Pinchart 2021-01-18 697 if (IS_ERR(casd)) { 539e7c5d7c0281 Laurent Pinchart 2020-07-06 698 phy_err(phy, "Failed to add subdev to notifier\n"); b01edcbd409cf7 Laurent Pinchart 2021-01-18 699 ret = PTR_ERR(casd); a539a0536f6e22 Laurent Pinchart 2020-07-06 700 goto error; d079f94c90469f Steve Longerbeam 2018-09-29 701 } d079f94c90469f Steve Longerbeam 2018-09-29 702 539e7c5d7c0281 Laurent Pinchart 2020-07-06 703 casd->phy = phy; a539a0536f6e22 Laurent Pinchart 2020-07-06 704 } 8fcb7576ad197b Laurent Pinchart 2020-07-06 705 a539a0536f6e22 Laurent Pinchart 2020-07-06 706 ret = v4l2_async_notifier_register(&cal->v4l2_dev, &cal->notifier); 343e89a792a571 Benoit Parrot 2016-01-06 707 if (ret) { a539a0536f6e22 Laurent Pinchart 2020-07-06 708 cal_err(cal, "Error registering async notifier\n"); a539a0536f6e22 Laurent Pinchart 2020-07-06 709 goto error; 343e89a792a571 Benoit Parrot 2016-01-06 710 } 343e89a792a571 Benoit Parrot 2016-01-06 711 f5ddf19eca3328 Laurent Pinchart 2020-07-06 712 return 0; a539a0536f6e22 Laurent Pinchart 2020-07-06 713 a539a0536f6e22 Laurent Pinchart 2020-07-06 714 error: a539a0536f6e22 Laurent Pinchart 2020-07-06 715 v4l2_async_notifier_cleanup(&cal->notifier); a539a0536f6e22 Laurent Pinchart 2020-07-06 716 return ret; a539a0536f6e22 Laurent Pinchart 2020-07-06 717 } a539a0536f6e22 Laurent Pinchart 2020-07-06 718 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org