reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/3e451c450d540c8d733336d136eed8f559eb9038
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Tanmay-Shah/rpmsg-virtio_rpmsg_bus-allow-different-size-of-tx-and-rx-bufs/20260507-142615
        git checkout 3e451c450d540c8d733336d136eed8f559eb9038

        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=$HOME/0day COMPILER=clang-17 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=hexagon olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-17 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash samples/rpmsg/