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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@oracle.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Eric Saint-Etienne <eric.saintetienne@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1542969759-24346-1-git-send-email-eric.saint.etienne@oracle.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Eric Saint-Etienne 2018-11-23 02:42:39 -08:00 committed by Arnaldo Carvalho de Melo
parent bc4da38a47
commit b18e088825
1 changed files with 6 additions and 7 deletions
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13
tools/perf/util/map.c
View File

@ -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;
}