1 files changed, 34 insertions, 1 deletions

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 941dc0a5a877..d6aac75b51ba 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -85,7 +85,23 @@
  * arguments just once each.
  */
 #define __round_mask(x, y) ((__typeof__(x))((y)-1))
+/**
+ * round_up - round up to next specified power of 2
+ * @x: the value to round
+ * @y: multiple to round up to (must be a power of 2)
+ *
+ * Rounds @x up to next multiple of @y (which must be a power of 2).
+ * To perform arbitrary rounding up, use roundup() below.
+ */
 #define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1)
+/**
+ * round_down - round down to next specified power of 2
+ * @x: the value to round
+ * @y: multiple to round down to (must be a power of 2)
+ *
+ * Rounds @x down to next multiple of @y (which must be a power of 2).
+ * To perform arbitrary rounding down, use rounddown() below.
+ */
 #define round_down(x, y) ((x) & ~__round_mask(x, y))
 
 /**
@@ -110,13 +126,30 @@
 # define DIV_ROUND_UP_SECTOR_T(ll,d) DIV_ROUND_UP(ll,d)
 #endif
 
-/* The `const' in roundup() prevents gcc-3.3 from calling __divdi3 */
+/**
+ * roundup - round up to the next specified multiple
+ * @x: the value to up
+ * @y: multiple to round up to
+ *
+ * Rounds @x up to next multiple of @y. If @y will always be a power
+ * of 2, consider using the faster round_up().
+ *
+ * The `const' here prevents gcc-3.3 from calling __divdi3
+ */
 #define roundup(x, y) (                                 \
 {                                                       \
         const typeof(y) __y = y;                        \
         (((x) + (__y - 1)) / __y) * __y;                \
 }                                                       \
 )
+/**
+ * rounddown - round down to next specified multiple
+ * @x: the value to round
+ * @y: multiple to round down to
+ *
+ * Rounds @x down to next multiple of @y. If @y will always be a power
+ * of 2, consider using the faster round_down().
+ */
 #define rounddown(x, y) (                               \
 {                                                       \
         typeof(x) __x = (x);                            \