reproduce (this is a W=1 build):
        git checkout 0c1c7a6a83feaf2cf182c52983ffe330ffb50280
        b4 shazam https://lore.kernel.org/r/20251118-only-one-vmalloc-v1-1-29f8eacb4605@ixit.cz

        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=$HOME/0day COMPILER=gcc-15.1.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=alpha olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-15.1.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=alpha SHELL=/bin/bash mm/