reproduce (this is a W=1 build):
        git remote add wireless https://git.kernel.org/pub/scm/linux/kernel/git/wireless/wireless.git
        git fetch wireless main
        git checkout wireless/main
        b4 shazam https://lore.kernel.org/r/20261020124446.188739-3-piotr@kubik.pl

        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=$HOME/0day COMPILER=gcc-15.3.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=powerpc olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-15.3.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=powerpc SHELL=/bin/bash net/mac80211/