[kbuild-all] block/bio.o: warning: objtool: bvec_alloc()+0x77: unreachable instruction

CC: linux-kernel(a)vger.kernel.org TO: Christoph Hellwig <hch(a)lst.de&gt; CC: Jens Axboe <axboe(a)kernel.dk&gt; tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 83e396641110663d3c7bb25b9bc0c6a750359ecf commit: 7a800a20ae6329e803c5c646b20811a6ae9ca136 block: use bi_max_vecs to find the bvec pool date: 1 year ago config: x86_64-buildonly-randconfig-r002-20220207 (https://download.01.org/0day-ci/archive/20220213/202202130617.yv6T7j1N-lk...) compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 0d8850ae2cae85d49bea6ae0799fa41c7202c05c) 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://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 7a800a20ae6329e803c5c646b20811a6ae9ca136 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash 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 >>): --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org