1 files changed, 21 insertions, 1 deletions

diff --git a/include/linux/nodemask.h b/include/linux/nodemask.h
index 905e18f4b412..848025cd7087 100644
--- a/include/linux/nodemask.h
+++ b/include/linux/nodemask.h
@@ -14,6 +14,8 @@
  * bitmap_scnlistprintf() and bitmap_parselist(), also in bitmap.c.
  * For details of node_remap(), see bitmap_bitremap in lib/bitmap.c.
  * For details of nodes_remap(), see bitmap_remap in lib/bitmap.c.
+ * For details of nodes_onto(), see bitmap_onto in lib/bitmap.c.
+ * For details of nodes_fold(), see bitmap_fold in lib/bitmap.c.
  *
  * The available nodemask operations are:
  *
@@ -55,7 +57,9 @@
  * int nodelist_scnprintf(buf, len, mask) Format nodemask as list for printing
  * int nodelist_parse(buf, map)         Parse ascii string as nodelist
  * int node_remap(oldbit, old, new)     newbit = map(old, new)(oldbit)
- * int nodes_remap(dst, src, old, new)  *dst = map(old, new)(dst)
+ * void nodes_remap(dst, src, old, new) *dst = map(old, new)(src)
+ * void nodes_onto(dst, orig, relmap)   *dst = orig relative to relmap
+ * void nodes_fold(dst, orig, sz)       dst bits = orig bits mod sz
  *
  * for_each_node_mask(node, mask)       for-loop node over mask
  *
@@ -326,6 +330,22 @@ static inline void __nodes_remap(nodemask_t *dstp, const nodemask_t *srcp,
         bitmap_remap(dstp->bits, srcp->bits, oldp->bits, newp->bits, nbits);
 }
 
+#define nodes_onto(dst, orig, relmap) \
+                __nodes_onto(&(dst), &(orig), &(relmap), MAX_NUMNODES)
+static inline void __nodes_onto(nodemask_t *dstp, const nodemask_t *origp,
+                const nodemask_t *relmapp, int nbits)
+{
+        bitmap_onto(dstp->bits, origp->bits, relmapp->bits, nbits);
+}
+
+#define nodes_fold(dst, orig, sz) \
+                __nodes_fold(&(dst), &(orig), sz, MAX_NUMNODES)
+static inline void __nodes_fold(nodemask_t *dstp, const nodemask_t *origp,
+                int sz, int nbits)
+{
+        bitmap_fold(dstp->bits, origp->bits, sz, nbits);
+}
+
 #if MAX_NUMNODES > 1
 #define for_each_node_mask(node, mask)                  \
         for ((node) = first_node(mask);                 \