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 v5.4.120 by commit 0b4eb172cc12dc102cd0ad013e53ee4463db9508, it was introduced in version v5.4.79 by commit b65458b6be8032c5179d4f562038575d7b3a6be3. For more details please see the references link.