reproduce (this is a W=1 build):
        git remote add broonie-regmap https://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap.git
        git fetch broonie-regmap for-next
        git checkout broonie-regmap/for-next
        b4 shazam https://lore.kernel.org/r/20260519170836.1344260-1-nissampa@cisco.com

        # install arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests

        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-16 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=arm64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-16 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash drivers/base/regmap/