reproduce (this is a W=1 build):
        git remote add cifs git://git.samba.org/sfrench/cifs-2.6.git
        git fetch cifs for-next
        git checkout cifs/for-next
        b4 shazam https://lore.kernel.org/r/20251024024909.474285-1-pc@manguebit.org

        # 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 fs/smb/client/