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X-CSE-ConnectionGUID: aiE6I45eT4uk7j4NwHtUyw== X-CSE-MsgGUID: BXChF1W6RVSh1h83XtwJ3g== X-IronPort-AV: E=McAfee;i="6800,10657,11923"; a="94252324" X-IronPort-AV: E=Sophos;i="6.27,138,1787036400"; d="scan'208";a="94252324" Received: from orviesa003.jf.intel.com ([10.64.159.143]) by fmvoesa107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Oct 2026 23:07:48 -0700 X-CSE-ConnectionGUID: 0N6YqMB/SluINdBjaHGEQg== X-CSE-MsgGUID: IY1CBXzJQICiaaxCRFaYtw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.27,138,1787036400"; d="scan'208";a="279652476" Received: from igk-lkp-server01.igk.intel.com (HELO 3fb566d470b1) ([10.211.93.152]) by orviesa003.jf.intel.com with ESMTP; 02 Oct 2026 23:07:46 -0700 Received: from kbuild by 3fb566d470b1 with local (Exim 4.98.2) (envelope-from ) id 1xCsuL-000000000xx-3Ca4; Sat, 03 Oct 2026 06:07:41 +0000 Date: Sat, 03 Oct 2026 08:07:21 +0200 From: kernel test robot To: oe-kbuild@lists.linux.dev Cc: lkp@intel.com Subject: arch/powerpc/boot/decompress.c:132:15: error: implicit declaration of function '__decompress' Message-ID: <202610030739.NAY0NNE2-lkp@intel.com> User-Agent: s-nail v14.9.25 Precedence: bulk X-Mailing-List: oe-kbuild@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: :::::: :::::: Manual check reason: "only suspicious fbc files changed" :::::: BCC: lkp@intel.com CC: oe-kbuild-all@lists.linux.dev CC: linux-kernel@vger.kernel.org TO: Masahiro Yamada CC: Nathan Chancellor CC: Nicolas Schier Hi Masahiro, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: e767a4ea70a3992c37ed604157d32f0dfbf9b1e3 commit: 0ce5139fd96e9d415d3faaef1c575e238f9bbd67 kbuild: always create intermediate vmlinux.unstripped date: 1 year ago :::::: branch date: 5 hours ago :::::: commit date: 1 year ago config: powerpc64-randconfig-r2201-20261003 (https://download.01.org/0day-ci/archive/20261003/202610030739.NAY0NNE2-lkp@intel.com/config) compiler: powerpc64-linux-gcc (GCC) 16.1.0 smatch: v0.5.0-9187-g5189e3fb reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261003/202610030739.NAY0NNE2-lkp@intel.com/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Fixes: 0ce5139fd96e ("kbuild: always create intermediate vmlinux.unstripped") | Reported-by: kernel test robot | Closes: https://lore.kernel.org/r/202610030739.NAY0NNE2-lkp@intel.com/ All errors (new ones prefixed by >>): arch/powerpc/boot/decompress.c: In function 'partial_decompress': >> arch/powerpc/boot/decompress.c:132:15: error: implicit declaration of function '__decompress' [-Wimplicit-function-declaration] 132 | ret = __decompress(inbuf, input_size, NULL, flush, outbuf, | ^~~~~~~~~~~~ vim +/__decompress +132 arch/powerpc/boot/decompress.c 1b7898ee276b39 Oliver O'Halloran 2016-09-22 97 1b7898ee276b39 Oliver O'Halloran 2016-09-22 98 /** 1b7898ee276b39 Oliver O'Halloran 2016-09-22 99 * partial_decompress - decompresses part or all of a compressed buffer 1b7898ee276b39 Oliver O'Halloran 2016-09-22 100 * @inbuf: input buffer 1b7898ee276b39 Oliver O'Halloran 2016-09-22 101 * @input_size: length of the input buffer 930a77c3ad79c3 Zhang Jianhua 2021-05-10 102 * @outbuf: output buffer 930a77c3ad79c3 Zhang Jianhua 2021-05-10 103 * @output_size: length of the output buffer 6efc2f1a64ef62 Yang Li 2024-04-08 104 * @_skip: number of output bytes to ignore 1b7898ee276b39 Oliver O'Halloran 2016-09-22 105 * 1b7898ee276b39 Oliver O'Halloran 2016-09-22 106 * This function takes compressed data from inbuf, decompresses and write it to 1b7898ee276b39 Oliver O'Halloran 2016-09-22 107 * outbuf. Once output_size bytes are written to the output buffer, or the 1b7898ee276b39 Oliver O'Halloran 2016-09-22 108 * stream is exhausted the function will return the number of bytes that were 1b7898ee276b39 Oliver O'Halloran 2016-09-22 109 * decompressed. Otherwise it will return whatever error code the decompressor 1b7898ee276b39 Oliver O'Halloran 2016-09-22 110 * reported (NB: This is specific to each decompressor type). 1b7898ee276b39 Oliver O'Halloran 2016-09-22 111 * 1b7898ee276b39 Oliver O'Halloran 2016-09-22 112 * The skip functionality is mainly there so the program and discover 1b7898ee276b39 Oliver O'Halloran 2016-09-22 113 * the size of the compressed image so that it can ask firmware (if present) 1b7898ee276b39 Oliver O'Halloran 2016-09-22 114 * for an appropriately sized buffer. 1b7898ee276b39 Oliver O'Halloran 2016-09-22 115 */ 1b7898ee276b39 Oliver O'Halloran 2016-09-22 116 long partial_decompress(void *inbuf, unsigned long input_size, 1b7898ee276b39 Oliver O'Halloran 2016-09-22 117 void *outbuf, unsigned long output_size, unsigned long _skip) 1b7898ee276b39 Oliver O'Halloran 2016-09-22 118 { 1b7898ee276b39 Oliver O'Halloran 2016-09-22 119 int ret; 1b7898ee276b39 Oliver O'Halloran 2016-09-22 120 1b7898ee276b39 Oliver O'Halloran 2016-09-22 121 /* 1b7898ee276b39 Oliver O'Halloran 2016-09-22 122 * The skipped bytes needs to be included in the size of data we want 1b7898ee276b39 Oliver O'Halloran 2016-09-22 123 * to decompress. 1b7898ee276b39 Oliver O'Halloran 2016-09-22 124 */ 1b7898ee276b39 Oliver O'Halloran 2016-09-22 125 output_size += _skip; 1b7898ee276b39 Oliver O'Halloran 2016-09-22 126 1b7898ee276b39 Oliver O'Halloran 2016-09-22 127 decompressed_bytes = 0; 1b7898ee276b39 Oliver O'Halloran 2016-09-22 128 output_buffer = outbuf; 1b7898ee276b39 Oliver O'Halloran 2016-09-22 129 limit = output_size; 1b7898ee276b39 Oliver O'Halloran 2016-09-22 130 skip = _skip; 1b7898ee276b39 Oliver O'Halloran 2016-09-22 131 1b7898ee276b39 Oliver O'Halloran 2016-09-22 @132 ret = __decompress(inbuf, input_size, NULL, flush, outbuf, :::::: The code at line 132 was first introduced by commit :::::: 1b7898ee276b39e54d870dc4ef3374f663d0b426 powerpc/boot: Use the pre-boot decompression API :::::: TO: Oliver O'Halloran :::::: CC: Michael Ellerman -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki