reproduce (this is a W=1 build):
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch linux-review Eric-Biggers/x86-fpu-Check-for-missing-AVX-and-AVX-512-xstate-bits/20260626-124221
        git checkout linux-review/Eric-Biggers/x86-fpu-Check-for-missing-AVX-and-AVX-512-xstate-bits/20260626-124221
        b4 shazam https://lore.kernel.org/r/20260722153247.630519-1-martin@strongswan.org

        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 olddefconfig
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash lib/crypto/