1 files changed, 6 insertions, 0 deletions

diff --git a/include/acpi/actbl.h b/include/acpi/actbl.h
index a46f406e1c94..ef2ddcadfe61 100644
--- a/include/acpi/actbl.h
+++ b/include/acpi/actbl.h
@@ -45,6 +45,12 @@
 #define __ACTBL_H__
 
 /*
+ * Note about bitfields: The u8 type is used for bitfields in ACPI tables.
+ * This is the only type that is even remotely portable. Anything else is not
+ * portable, so do not use any other bitfield types.
+ */
+
+/*
  *  Values for description table header signatures
  */
 #define RSDP_NAME               "RSDP"