reproduce (this is a W=1 build): git clone https://github.com/intel/lkp-tests.git ~/lkp-tests # install riscv cross compiling tool for clang build # apt-get install binutils-riscv64-linux-gnu # https://github.com/goldwynr/linux/commit/45eacf0a5df755882983e869171c18304be7dbfd git remote add goldwynr https://github.com/goldwynr/linux git fetch --no-tags goldwynr iomap.1 git checkout 45eacf0a5df755882983e869171c18304be7dbfd # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-19 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=riscv olddefconfig COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-19 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash fs/btrfs/