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I think this is correct except that the /boot/grub2/grubenv file does not show the update.
We need to check the bootloader entries config files in `/boot/loader/entries/` directory. There will be one for each boot entry. grubby updates these files. So here is a slightly modified commands -
grubby --update-kernel=ALL --args="kmcrl=5"
ls /boot/loader/entries/
# check if the kernel args are updated in the conf files. added in the end of the line
grep options /boot/loader/entries/8cxxxxx.conf
sytemctl reboot
cat /proc/cmdline
In RHEL8
# grub2-editenv - list | grep kernelopts
# grub2-editenv - set "kernelopts=root=/dev/mapper/rhel-root ..... kmcrl=5
# systemctl reboot
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