reproduce (this is a W=1 build):
        git checkout 9e0898f1c0f134c6bad146ca8578f73c3e40ac0a
        b4 shazam https://lore.kernel.org/r/20260508-hsr_ptp-v4-1-aa19aa7c6a71@linutronix.de

        # install mips cross compiling tool for clang build
        # apt-get install binutils-mips-linux-gnu
        # clang-23 might not be officially released. Try a lower version if installation fails.
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        # apt-get install sparse
        # sparse: v0.6.5-rc1

        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-23 ~/lkp-tests/kbuild/make.cross W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__ -fmax-errors=unlimited -fmax-warnings=unlimited' O=build_dir ARCH=mips olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-23 ~/lkp-tests/kbuild/make.cross W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__ -fmax-errors=unlimited -fmax-warnings=unlimited' O=build_dir ARCH=mips SHELL=/bin/bash arch/mips/kernel/ arch/mips/mm/ kernel/time/ net/bluetooth/rfcomm/ net/hsr/