reproduce (this is a W=1 build):
        git checkout c42ba5a87bdccbca11403b7ca8bad1a57b833732
        b4 shazam https://lore.kernel.org/r/20251122-tonyk-robust_futex-v6-6-05fea005a0fd@igalia.com

        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=$HOME/0day COMPILER=gcc-15.1.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=powerpc olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-15.1.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=powerpc prepare