有効なカーネルコマンドラインで "Unknown kernel command line parameters:" と表示される

Issue

• カーネルコマンドラインパラメーターが不明です。
• 有効なカーネルパラメーターが Unknown kernel command line parameters として分類されます。

# dmesg | grep 'Kernel command line'
[    0.021831] Kernel command line: BOOT_IMAGE=(hd0,msdos1)/vmlinuz-5.14.0-162.6.1.el9_1.x86_64 root=/dev/mapper/rhel_hp--bl460cg9--1-root ro crashkernel=1G-4G:192M,4G-64G:256M,64G-:512M resume=/dev/mapper/rhel_hp--bl460cg9--1-swap rd.lvm.lv=rhel_hp-bl460cg9-1/root rd.lvm.lv=rhel_hp-bl460cg9-1/swap console=ttyS0,115200 no5lvl
[   28.996505] systemd[1]: Starting Generate network units from Kernel command line...
[root@hp-bl460cg9-1 ~]# dmesg | grep no5lvl
[    0.000000] Command line: BOOT_IMAGE=(hd0,msdos1)/vmlinuz-5.14.0-162.6.1.el9_1.x86_64 root=/dev/mapper/rhel_hp--bl460cg9--1-root ro crashkernel=1G-4G:192M,4G-64G:256M,64G-:512M resume=/dev/mapper/rhel_hp--bl460cg9--1-swap rd.lvm.lv=rhel_hp-bl460cg9-1/root rd.lvm.lv=rhel_hp-bl460cg9-1/swap console=ttyS0,115200 no5lvl
[    0.021831] Kernel command line: BOOT_IMAGE=(hd0,msdos1)/vmlinuz-5.14.0-162.6.1.el9_1.x86_64 root=/dev/mapper/rhel_hp--bl460cg9--1-root ro crashkernel=1G-4G:192M,4G-64G:256M,64G-:512M resume=/dev/mapper/rhel_hp--bl460cg9--1-swap rd.lvm.lv=rhel_hp-bl460cg9-1/root rd.lvm.lv=rhel_hp-bl460cg9-1/swap console=ttyS0,115200 no5lvl
[    0.021943] Unknown kernel command line parameters "no5lvl BOOT_IMAGE=(hd0,msdos1)/vmlinuz-5.14.0-162.6.1.el9_1.x86_64", will be passed to user space.
[   16.732762]     no5lvl  <<-----