RHEL7: kernel commandline parameters are ignored if any invalid parameter is encoutered.

Issue

• RHEL7: kernel commandline parameters are ignored if any invalid parameter is encoutered.
• We have isolated CPU in the boot configuration, and same is confirmed from the /proc/cmdline. However we do not see isolated cpus in /sys/devices/system/cpu

Kernel command line: BOOT_IMAGE=/vmlinuz-3.10.0-1160.el7.x86_64 root=/dev/mapper/rhel_dhcp130--155-root ro crashkernel=auto spectre_v2=retpoline rd.lvm.lv=rhel_dhcp130-155/root rd.lvm.lv=rhel_dhcp130-155/swap rhgb quiet LANG=en_US.UTF-8 selinux=0 elevator=deadline printk.time=2 intel_idle.max_cstat=0 processor.max_cstat=0 idle=poll mce=off nohz=off isolcpus=1-2 rcu_nocbs=2-23 rcu_nocb_poll nopti numa_balancing=disable rcutree.kthread_prio=3 skew_tick=1 intel_pstat=disabe mitigations=off

# cat /sys/devices/system/cpu/isolated
<nothing>