Hi Laurent, I love your patch! Perhaps something to improve: [auto build test WARNING on v5.6-rc6] [also build test WARNING on next-20200318] [cannot apply to linuxtv-media/master] [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/Laurent-Pinchart/v4l2-dev-ioctl-... base: fb33c6510d5595144d585aa194d377cf74d31911 config: parisc-allyesconfig (attached as .config) compiler: hppa-linux-gcc (GCC) 9.2.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree GCC_VERSION=9.2.0 make.cross ARCH=parisc If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): drivers/media//pci/cx18/cx18-ioctl.c: In function 'cx18_enum_fmt_vid_cap': 470 | "HM12 (YUV 4:1:1)", V4L2_PIX_FMT_HM12, { 0, 0, 0, 0 } | ^~~~~~~~~~~~~~~~~~ drivers/media//pci/cx18/cx18-ioctl.c:470:5: note: (near initialization for 'formats[0].mbus_code') 470 | "HM12 (YUV 4:1:1)", V4L2_PIX_FMT_HM12, { 0, 0, 0, 0 } | ^ drivers/media//pci/cx18/cx18-ioctl.c:470:49: note: (near initialization for 'formats[0].mbus_code') drivers/media//pci/cx18/cx18-ioctl.c:470:52: warning: excess elements in scalar initializer 470 | "HM12 (YUV 4:1:1)", V4L2_PIX_FMT_HM12, { 0, 0, 0, 0 } | ^ drivers/media//pci/cx18/cx18-ioctl.c:470:52: note: (near initialization for 'formats[0].mbus_code') drivers/media//pci/cx18/cx18-ioctl.c:470:55: warning: excess elements in scalar initializer 470 | "HM12 (YUV 4:1:1)", V4L2_PIX_FMT_HM12, { 0, 0, 0, 0 } | ^ drivers/media//pci/cx18/cx18-ioctl.c:470:55: note: (near initialization for 'formats[0].mbus_code') drivers/media//pci/cx18/cx18-ioctl.c:473:5: warning: braces around scalar initializer 473 | "MPEG", V4L2_PIX_FMT_MPEG, { 0, 0, 0, 0 } | ^~~~~~ drivers/media//pci/cx18/cx18-ioctl.c:473:5: note: (near initialization for 'formats[1].mbus_code') drivers/media//pci/cx18/cx18-ioctl.c:473:37: warning: excess elements in scalar initializer 473 | "MPEG", V4L2_PIX_FMT_MPEG, { 0, 0, 0, 0 } | ^ drivers/media//pci/cx18/cx18-ioctl.c:473:37: note: (near initialization for 'formats[1].mbus_code') drivers/media//pci/cx18/cx18-ioctl.c:473:40: warning: excess elements in scalar initializer 473 | "MPEG", V4L2_PIX_FMT_MPEG, { 0, 0, 0, 0 } | ^ drivers/media//pci/cx18/cx18-ioctl.c:473:40: note: (near initialization for 'formats[1].mbus_code') drivers/media//pci/cx18/cx18-ioctl.c:473:43: warning: excess elements in scalar initializer 473 | "MPEG", V4L2_PIX_FMT_MPEG, { 0, 0, 0, 0 } | ^ drivers/media//pci/cx18/cx18-ioctl.c:473:43: note: (near initialization for 'formats[1].mbus_code') drivers/media//pci/cx18/cx18-ioctl.c:476:5: warning: braces around scalar initializer 476 | "UYVY 4:2:2", V4L2_PIX_FMT_UYVY, { 0, 0, 0, 0 } | ^~~~~~~~~~~~ drivers/media//pci/cx18/cx18-ioctl.c:476:5: note: (near initialization for 'formats[2].mbus_code') drivers/media//pci/cx18/cx18-ioctl.c:476:43: warning: excess elements in scalar initializer 476 | "UYVY 4:2:2", V4L2_PIX_FMT_UYVY, { 0, 0, 0, 0 } | ^ drivers/media//pci/cx18/cx18-ioctl.c:476:43: note: (near initialization for 'formats[2].mbus_code') drivers/media//pci/cx18/cx18-ioctl.c:476:46: warning: excess elements in scalar initializer 476 | "UYVY 4:2:2", V4L2_PIX_FMT_UYVY, { 0, 0, 0, 0 } | ^ drivers/media//pci/cx18/cx18-ioctl.c:476:46: note: (near initialization for 'formats[2].mbus_code') drivers/media//pci/cx18/cx18-ioctl.c:476:49: warning: excess elements in scalar initializer 476 | "UYVY 4:2:2", V4L2_PIX_FMT_UYVY, { 0, 0, 0, 0 } | ^ drivers/media//pci/cx18/cx18-ioctl.c:476:49: note: (near initialization for 'formats[2].mbus_code') vim +470 drivers/media//pci/cx18/cx18-ioctl.c 1c1e45d17b663d drivers/media/video/cx18/cx18-ioctl.c Hans Verkuil 2008-04-28 464 3b6fe58f0f1888 drivers/media/video/cx18/cx18-ioctl.c Andy Walls 2008-06-21 465 static int cx18_enum_fmt_vid_cap(struct file *file, void *fh, 3b6fe58f0f1888 drivers/media/video/cx18/cx18-ioctl.c Andy Walls 2008-06-21 466 struct v4l2_fmtdesc *fmt) 3b6fe58f0f1888 drivers/media/video/cx18/cx18-ioctl.c Andy Walls 2008-06-21 467 { 1bf5842fe3b61d drivers/media/video/cx18/cx18-ioctl.c Simon Farnsworth 2011-05-03 468 static const struct v4l2_fmtdesc formats[] = { 1bf5842fe3b61d drivers/media/video/cx18/cx18-ioctl.c Simon Farnsworth 2011-05-03 469 { 0, V4L2_BUF_TYPE_VIDEO_CAPTURE, 0, 1bf5842fe3b61d drivers/media/video/cx18/cx18-ioctl.c Simon Farnsworth 2011-05-03 @470 "HM12 (YUV 4:1:1)", V4L2_PIX_FMT_HM12, { 0, 0, 0, 0 } 1bf5842fe3b61d drivers/media/video/cx18/cx18-ioctl.c Simon Farnsworth 2011-05-03 471 }, 1bf5842fe3b61d drivers/media/video/cx18/cx18-ioctl.c Simon Farnsworth 2011-05-03 472 { 1, V4L2_BUF_TYPE_VIDEO_CAPTURE, V4L2_FMT_FLAG_COMPRESSED, 1bf5842fe3b61d drivers/media/video/cx18/cx18-ioctl.c Simon Farnsworth 2011-05-03 473 "MPEG", V4L2_PIX_FMT_MPEG, { 0, 0, 0, 0 } 1bf5842fe3b61d drivers/media/video/cx18/cx18-ioctl.c Simon Farnsworth 2011-05-03 474 }, 1bf5842fe3b61d drivers/media/video/cx18/cx18-ioctl.c Simon Farnsworth 2011-05-03 475 { 2, V4L2_BUF_TYPE_VIDEO_CAPTURE, 0, 1bf5842fe3b61d drivers/media/video/cx18/cx18-ioctl.c Simon Farnsworth 2011-05-03 476 "UYVY 4:2:2", V4L2_PIX_FMT_UYVY, { 0, 0, 0, 0 } 1bf5842fe3b61d drivers/media/video/cx18/cx18-ioctl.c Simon Farnsworth 2011-05-03 477 }, 1bf5842fe3b61d drivers/media/video/cx18/cx18-ioctl.c Simon Farnsworth 2011-05-03 478 }; 1bf5842fe3b61d drivers/media/video/cx18/cx18-ioctl.c Simon Farnsworth 2011-05-03 479 b7101de3fff596 drivers/media/video/cx18/cx18-ioctl.c Steven Toth 2011-04-06 480 if (fmt->index > ARRAY_SIZE(formats) - 1) 1c1e45d17b663d drivers/media/video/cx18/cx18-ioctl.c Hans Verkuil 2008-04-28 481 return -EINVAL; 1c1e45d17b663d drivers/media/video/cx18/cx18-ioctl.c Hans Verkuil 2008-04-28 482 *fmt = formats[fmt->index]; 1c1e45d17b663d drivers/media/video/cx18/cx18-ioctl.c Hans Verkuil 2008-04-28 483 return 0; 1c1e45d17b663d drivers/media/video/cx18/cx18-ioctl.c Hans Verkuil 2008-04-28 484 } 1c1e45d17b663d drivers/media/video/cx18/cx18-ioctl.c Hans Verkuil 2008-04-28 485 :::::: The code at line 470 was first introduced by commit :::::: 1bf5842fe3b61d2dbbced96dbd27ad26fe93444a [media] cx18: Clean up mmap() support for raw YUV :::::: TO: Simon Farnsworth <simon.farnsworth(a)onelan.co.uk&gt; :::::: CC: Mauro Carvalho Chehab <mchehab(a)redhat.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org