SystemReady band ACS Linux runs into kernel RCU panic while running init.sh

[sunnywang-arm]

The issue has been fixed internally. Just raised a issue for external partners' reference and will be closed once the fix gets merged.

Issue:

• The kernel panic indicates that some cores/PEs did not schedule or service what RCU needs for too long.
• Disabling PSCI checker can work around the issue.
• Adding cppc_cpufreq.ko driver can work around the issue.
• The issue doesn’t happen with other Linux distros. Running PSCI checker in openSUSE cannot reproduce the issue.

Solution:

• ACS Linux RCU settings are more aggressive and less tolerant of firmware and power-management latency than Linux distros. Solution is to align with Linux distro configuration to avoid false RCU stall detection in ACS Linux.