powerpc/64s: Fix crashes when toggling entry flush barrier
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v4.9.269 by commit 0c25a7bb697f2e6ee65b6d63782f675bf129511a, it was introduced in version v4.9.245 by commit fa4bf9f38184ed7ca4916eb64f8c767d1e279c1f. For more details please see the references link.