[tip:perf/core] perf map: Remove extra indirection from map__find()

[tip-bot for Eric Saint-Etienne]

Commit-ID:  97dfc3423ca701212802a02994d1ec3e688f4891
Gitweb:     https://git.kernel.org/tip/97dfc3423ca701212802a02994d1ec3e688f4891
Author:     Eric Saint-Etienne <eric.saint.etienne@xxxxxxxxxx>
AuthorDate: Fri, 23 Nov 2018 02:42:39 -0800
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Thu, 29 Nov 2018 20:42:46 -0300

perf map: Remove extra indirection from map__find()

A double pointer is used in map__find() where a single pointer is enough
because the function doesn't affect the rbtree and the rbtree is locked.

Signed-off-by: Eric Saint-Etienne <eric.saint.etienne@xxxxxxxxxx>
Acked-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: Eric Saint-Etienne <eric.saintetienne@xxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/1542969759-24346-1-git-send-email-eric.saint.etienne@xxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/util/map.c | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index 781eed8e3265..a0d58b4d9c32 100644
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -873,19 +873,18 @@ void maps__remove(struct maps *maps, struct map *map)
 
 struct map *maps__find(struct maps *maps, u64 ip)
 {
-	struct rb_node **p, *parent = NULL;
+	struct rb_node *p;
 	struct map *m;
 
 	down_read(&maps->lock);
 
-	p = &maps->entries.rb_node;
-	while (*p != NULL) {
-		parent = *p;
-		m = rb_entry(parent, struct map, rb_node);
+	p = maps->entries.rb_node;
+	while (p != NULL) {
+		m = rb_entry(p, struct map, rb_node);
 		if (ip < m->start)
-			p = &(*p)->rb_left;
+			p = p->rb_left;
 		else if (ip >= m->end)
-			p = &(*p)->rb_right;
+			p = p->rb_right;
 		else
 			goto out;
 	}