linux   /vmlinuz-4.18.14-gentoo root=/dev/mapper/vg-lvroot ro real_root=/dev/mapper/vg-lvroot crypt_root=UUID=89ea28ce-b970-4d57-b9db-8c9152f049e5 noatime txmod=wa rootfstype=reiserfs dolvm root_trim=yes 

;;works

linux   /vmlinuz-4.19.27-gentoo-r1 root=/dev/mapper/vg-lvroot ro real_root=/dev/mapper/vg-lvroot crypt_root=UUID=89ea28ce-b970-4d57-b9db-8c9152f049e5 no
atime txmod=wa rootfstype=reiserfs dolvm root_trim=yes

;;doesn't work