reproduce (this is a W=1 build):
        git remote add ath https://git.kernel.org/pub/scm/linux/kernel/git/ath/ath.git
        git fetch ath ath-next
        git checkout ath/ath-next
        b4 shazam https://lore.kernel.org/r/20251210024036.3965135-1-mr.nuke.me@gmail.com

        # install sparc64 cross compiling tool for clang build
        # apt-get install binutils-sparc64-linux-gnu
        # clang-22 might not be officially released. Try a lower version if installation fails.
        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=$HOME/0day COMPILER=clang-22 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=sparc64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-22 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=sparc64 SHELL=/bin/bash drivers/net/wireless/ath/ath11k/