reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/bdb144cb86b6b1bf65cdbd4097bf557b940e24e4
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Ackerley-Tng/KVM-selftests-Initialize-guest_memfd-with-INIT_SHARED/20260512-184801
        git checkout bdb144cb86b6b1bf65cdbd4097bf557b940e24e4
        # apt-get install llvm-dev

        # save the config file
        make W=1 ARCH=x86_64 olddefconfig
        make W=1 ARCH=x86_64 
        make W=1 headers_install
        make W=1 -C tools/testing/selftests