Hi, This does not seem to have subsumed the AMD specific code in x86/pti: Do not enable PTI on CPUs which are not vulnerable to Meltdown Commit a8799fd14d9f7f385a5a5c86cde247caf4bb0320 https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit/?h=v4.9.81&id=a8799fd14d9f7f385a5a5c86cde247caf4bb0320 x86/kaiser: Check boottime cmdline params Commit 8018307a45a90ab2eecfd03d48b7efb31707df37 https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit/arch/x86/mm/kaiser.c?h=v4.9.75&id=8018307a45a90ab2eecfd03d48b7efb31707df37 Here, we can see: +skip: + if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD) + goto disable; Refer to 4.9.81's kaiser.c https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/tree/arch/x86/mm/kaiser.c?h=v4.9.81 Also 4.4.115's kaiser.c https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/tree/arch/x86/mm/kaiser.c?h=v4.4.115 Cheers, Nick