tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 40226a3d96ef8ab8980f032681c8bfd46d63874e commit: 2db16c6ed72ce644d5639b3ed15e5817442db4ba media: imx-jpeg: Add V4L2 driver for i.MX8 JPEG Encoder/Decoder date: 4 months ago config: mips-randconfig-r004-20210714 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 8d69635ed9ecf36fd0ca85906bfde17949671cbe) 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 # install mips cross compiling tool for clang build # apt-get install binutils-mips-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 2db16c6ed72ce644d5639b3ed15e5817442db4ba # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips 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 >>): _bswap16(&sof->height); ^~~~~~~~~~~ _bswap16(&sof->width); ^~~~~~~~~~ _bswap16(&sof->length); ^~~~~~~~~~~ _bswap16(&sos->length); ^~~~~~~~~~~ 4 warnings generated. vim +652 drivers/media/platform/imx-jpeg/mxc-jpeg.c 643 644 static int mxc_jpeg_fixup_sof(struct mxc_jpeg_sof *sof, 645 u32 fourcc, 646 u16 w, u16 h) 647 { 648 int sof_length; 649 650 sof->precision = 8; /* TODO allow 8/12 bit precision*/ 651 sof->height = h; 653 sof->width = w; 655 656 switch (fourcc) { 657 case V4L2_PIX_FMT_NV12: 658 sof->components_no = 3; 659 sof->comp[0].v = 0x2; 660 sof->comp[0].h = 0x2; 661 break; 662 case V4L2_PIX_FMT_YUYV: 663 sof->components_no = 3; 664 sof->comp[0].v = 0x1; 665 sof->comp[0].h = 0x2; 666 break; 667 case V4L2_PIX_FMT_YUV24: 668 case V4L2_PIX_FMT_RGB24: 669 default: 670 sof->components_no = 3; 671 break; 672 case V4L2_PIX_FMT_ARGB32: 673 sof->components_no = 4; 674 break; 675 case V4L2_PIX_FMT_GREY: 676 sof->components_no = 1; 677 break; 678 } 679 sof_length = 8 + 3 * sof->components_no; 680 sof->length = sof_length; 682 683 return sof_length; /* not swaped */ 684 } 685 686 static int mxc_jpeg_fixup_sos(struct mxc_jpeg_sos *sos, 687 u32 fourcc) 688 { 689 int sos_length; 690 u8 *sof_u8 = (u8 *)sos; 691 692 switch (fourcc) { 693 case V4L2_PIX_FMT_NV12: 694 sos->components_no = 3; 695 break; 696 case V4L2_PIX_FMT_YUYV: 697 sos->components_no = 3; 698 break; 699 case V4L2_PIX_FMT_YUV24: 700 case V4L2_PIX_FMT_RGB24: 701 default: 702 sos->components_no = 3; 703 break; 704 case V4L2_PIX_FMT_ARGB32: 705 sos->components_no = 4; 706 break; 707 case V4L2_PIX_FMT_GREY: 708 sos->components_no = 1; 709 break; 710 } 711 sos_length = 6 + 2 * sos->components_no; 712 sos->length = sos_length; 714 715 /* SOS ignorable bytes, not so ignorable after all */ 716 sof_u8[sos_length - 1] = 0x0; 717 sof_u8[sos_length - 2] = 0x3f; 718 sof_u8[sos_length - 3] = 0x0; 719 720 return sos_length; /* not swaped */ 721 } 722 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org