[PATCHv11 2.6.36-rc2-tip 13/15] 13: perf: Loop thro each of the maps in a map_group.

[Srikar Dronamraju <srikar@linux.vnet.ibm.com>]

Introduces map_groups_for_each_map that iterates over a map_group.
This is useful while listing functions through perf-probe.

Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Suggested-by: Arnaldo Carvalho de Melo <acme@infradead.org>
---
 tools/perf/util/map.h |   27 +++++++++++++++++++++++++++
 1 files changed, 27 insertions(+), 0 deletions(-)

diff --git a/tools/perf/util/map.h b/tools/perf/util/map.h
index 7857579..45b5f50 100644
--- a/tools/perf/util/map.h
+++ b/tools/perf/util/map.h
@@ -54,6 +54,33 @@ struct map_groups {
 	struct machine	 *machine;
 };
 
+/* For map_groups iteration */
+static inline struct map *map__first(struct map_groups *self,
+						enum map_type type)
+{
+	struct rb_node *rn = rb_first(&self->maps[type]);
+	return rn ? rb_entry(rn, struct map, rb_node) : NULL;
+}
+
+static inline struct map *map__next(struct map *map)
+{
+	struct rb_node *rn;
+	if (!map)
+		return NULL;
+	rn = rb_next(&map->rb_node);
+	return rn ? rb_entry(rn, struct map, rb_node) : NULL;
+}
+
+/**
+ * map_groups__for_each_map      - iterate over a map_group
+ * @pos:	the &struct map to use as a loop cursor.
+ * @type:	the map type.
+ * @self:	the &struct map_groups for loop.
+ */
+#define map_groups__for_each_map(pos, type, self)	\
+	for (pos = map__first(self, type); pos;		\
+				pos = map__next(pos))
+
 /* Native host kernel uses -1 as pid index in machine */
 #define	HOST_KERNEL_ID			(-1)
 #define	DEFAULT_GUEST_KERNEL_ID		(0)