reproduce (this is a W=1 build):
        # https://github.com/scosu/linux-sched/commit/1ab05c9b1f5b7d7f615c289b441e2bf963123a0e
        git remote add scosu-sched https://github.com/scosu/linux-sched
        git fetch --no-tags scosu-sched topic/mmap-cap-prot-wip/v6.18
        git checkout 1ab05c9b1f5b7d7f615c289b441e2bf963123a0e

        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=$HOME/0day COMPILER=gcc-15.2.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=csky olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-15.2.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=csky SHELL=/bin/bash drivers/android/tests/ drivers/gpu/drm/v3d/ drivers/gpu/drm/virtio/ drivers/gpu/drm/xe/ drivers/scsi/arcmsr/ fs/ io_uring/ kernel/ lib/ mm/ net/nfc/nci/