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 v4.4.269 by commit 8382b15864e5014261b4f36c2aa89723612ee058, it was introduced in version v4.4.245 by commit 4a1e90af718d1489ffcecc8f52486c4f5dc0f7a6. For more details please see the references link.