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-rw-r--r--arch/x86/kernel/process.c23
-rw-r--r--init/main.c3
2 files changed, 26 insertions, 0 deletions
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 29bbbce4f2fd..ced76f13d20d 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -418,6 +418,29 @@ void __init init_amd_e400_c1e_mask(void)
zalloc_cpumask_var(&amd_e400_c1e_mask, GFP_KERNEL);
}
+void __init arch_post_acpi_subsys_init(void)
+{
+ u32 lo, hi;
+
+ if (!boot_cpu_has_bug(X86_BUG_AMD_E400))
+ return;
+
+ /*
+ * AMD E400 detection needs to happen after ACPI has been enabled. If
+ * the machine is affected K8_INTP_C1E_ACTIVE_MASK bits are set in
+ * MSR_K8_INT_PENDING_MSG.
+ */
+ rdmsr(MSR_K8_INT_PENDING_MSG, lo, hi);
+ if (!(lo & K8_INTP_C1E_ACTIVE_MASK))
+ return;
+
+ boot_cpu_set_bug(X86_BUG_AMD_APIC_C1E);
+
+ if (!boot_cpu_has(X86_FEATURE_NONSTOP_TSC))
+ mark_tsc_unstable("TSC halt in AMD C1E");
+ pr_info("System has AMD C1E enabled\n");
+}
+
static int __init idle_setup(char *str)
{
if (!str)
diff --git a/init/main.c b/init/main.c
index 2858be732f6d..1d7038c1ee19 100644
--- a/init/main.c
+++ b/init/main.c
@@ -448,6 +448,8 @@ void __init parse_early_param(void)
done = 1;
}
+void __init __weak arch_post_acpi_subsys_init(void) { }
+
void __init __weak smp_setup_processor_id(void)
{
}
@@ -649,6 +651,7 @@ asmlinkage __visible void __init start_kernel(void)
check_bugs();
acpi_subsystem_init();
+ arch_post_acpi_subsys_init();
sfi_init_late();
if (efi_enabled(EFI_RUNTIME_SERVICES)) {