reproduce (this is a W=1 build):
        # https://github.com/intel/linux-intel-lts/commit/0261c1973ea02eb7a596dda743b1c1a212662aa2
        git remote add intel-lts https://github.com/intel/linux-intel-lts.git
        git fetch --no-tags intel-lts 6.12/dovetail-xenomai
        git checkout 0261c1973ea02eb7a596dda743b1c1a212662aa2
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 olddefconfig
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash arch/x86/kernel/