1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/edac/i3000_edac.c b/drivers/edac/i3000_edac.c
index b813f356b390..5d4292811c14 100644
--- a/drivers/edac/i3000_edac.c
+++ b/drivers/edac/i3000_edac.c
@@ -44,6 +44,13 @@
                                  */
 #define I3000_DEAP_GRAIN                (1 << 7)
 
+/*
+ * Helper functions to decode the DEAP/EDEAP hardware registers.
+ *
+ * The type promotion here is deliberate; we're deriving an
+ * unsigned long pfn and offset from hardware regs which are u8/u32.
+ */
+
 static inline unsigned long deap_pfn(u8 edeap, u32 deap)
 {
         deap >>= PAGE_SHIFT;