Hi Nick, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 62fb9874f5da54fdb243003b386128037319b219 commit: 1e1b6d63d6340764e00356873e5794225a2a03ea lib/string.c: implement stpcpy date: 9 months ago config: powerpc64-randconfig-r003-20210628 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 59558129276098d62046c8cda92240d292cbfb1c) 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 powerpc64 cross compiling tool for clang build # apt-get install binutils-powerpc64-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1e1b6d63d6340764e00356873e5794225a2a03ea git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 1e1b6d63d6340764e00356873e5794225a2a03ea # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): >> arch/powerpc/boot/decompress.c:133:8: warning: implicit declaration of function '__decompress' is invalid in C99 [-Wimplicit-function-declaration] ret = __decompress(inbuf, input_size, NULL, flush, outbuf, ^ 1 warning generated. vim +/__decompress +133 arch/powerpc/boot/decompress.c 1b7898ee276b39 Oliver O'Halloran 2016-09-22 98 1b7898ee276b39 Oliver O'Halloran 2016-09-22 99 /** 1b7898ee276b39 Oliver O'Halloran 2016-09-22 100 * partial_decompress - decompresses part or all of a compressed buffer 1b7898ee276b39 Oliver O'Halloran 2016-09-22 101 * @inbuf: input buffer 1b7898ee276b39 Oliver O'Halloran 2016-09-22 102 * @input_size: length of the input buffer 1b7898ee276b39 Oliver O'Halloran 2016-09-22 103 * @outbuf: input buffer 1b7898ee276b39 Oliver O'Halloran 2016-09-22 104 * @output_size: length of the input buffer 1b7898ee276b39 Oliver O'Halloran 2016-09-22 105 * @skip number of output bytes to ignore 1b7898ee276b39 Oliver O'Halloran 2016-09-22 106 * 1b7898ee276b39 Oliver O'Halloran 2016-09-22 107 * This function takes compressed data from inbuf, decompresses and write it to 1b7898ee276b39 Oliver O'Halloran 2016-09-22 108 * outbuf. Once output_size bytes are written to the output buffer, or the 1b7898ee276b39 Oliver O'Halloran 2016-09-22 109 * stream is exhausted the function will return the number of bytes that were 1b7898ee276b39 Oliver O'Halloran 2016-09-22 110 * decompressed. Otherwise it will return whatever error code the decompressor 1b7898ee276b39 Oliver O'Halloran 2016-09-22 111 * reported (NB: This is specific to each decompressor type). 1b7898ee276b39 Oliver O'Halloran 2016-09-22 112 * 1b7898ee276b39 Oliver O'Halloran 2016-09-22 113 * The skip functionality is mainly there so the program and discover 1b7898ee276b39 Oliver O'Halloran 2016-09-22 114 * the size of the compressed image so that it can ask firmware (if present) 1b7898ee276b39 Oliver O'Halloran 2016-09-22 115 * for an appropriately sized buffer. 1b7898ee276b39 Oliver O'Halloran 2016-09-22 116 */ 1b7898ee276b39 Oliver O'Halloran 2016-09-22 117 long partial_decompress(void *inbuf, unsigned long input_size, 1b7898ee276b39 Oliver O'Halloran 2016-09-22 118 void *outbuf, unsigned long output_size, unsigned long _skip) 1b7898ee276b39 Oliver O'Halloran 2016-09-22 119 { 1b7898ee276b39 Oliver O'Halloran 2016-09-22 120 int ret; 1b7898ee276b39 Oliver O'Halloran 2016-09-22 121 1b7898ee276b39 Oliver O'Halloran 2016-09-22 122 /* 1b7898ee276b39 Oliver O'Halloran 2016-09-22 123 * The skipped bytes needs to be included in the size of data we want 1b7898ee276b39 Oliver O'Halloran 2016-09-22 124 * to decompress. 1b7898ee276b39 Oliver O'Halloran 2016-09-22 125 */ 1b7898ee276b39 Oliver O'Halloran 2016-09-22 126 output_size += _skip; 1b7898ee276b39 Oliver O'Halloran 2016-09-22 127 1b7898ee276b39 Oliver O'Halloran 2016-09-22 128 decompressed_bytes = 0; 1b7898ee276b39 Oliver O'Halloran 2016-09-22 129 output_buffer = outbuf; 1b7898ee276b39 Oliver O'Halloran 2016-09-22 130 limit = output_size; 1b7898ee276b39 Oliver O'Halloran 2016-09-22 131 skip = _skip; 1b7898ee276b39 Oliver O'Halloran 2016-09-22 132 1b7898ee276b39 Oliver O'Halloran 2016-09-22 @133 ret = __decompress(inbuf, input_size, NULL, flush, outbuf, :::::: The code at line 133 was first introduced by commit :::::: 1b7898ee276b39e54d870dc4ef3374f663d0b426 powerpc/boot: Use the pre-boot decompression API :::::: TO: Oliver O'Halloran <oohall@xxxxxxxxx> :::::: CC: Michael Ellerman <mpe@xxxxxxxxxxxxxx> --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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