diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
index 713b763..ab00afec 100644
--- a/drivers/acpi/processor_core.c
+++ b/drivers/acpi/processor_core.c
@@ -110,7 +110,7 @@
 };
 
 struct acpi_processor *processors[NR_CPUS];
-struct acpi_processor_errata errata;
+struct acpi_processor_errata errata __read_mostly;
 
 /* --------------------------------------------------------------------------
                                 Errata Handling