[tip:perf/core] perf hists browser: replace rb_first() != NULL by !RB_EMPTY_ROOT()

tip-bot for Arnaldo Carvalho de Melo
2010-08-30T08:34:38Z

Commit-ID: 293db47f4753f5746e5aaa998ceb24dff662cf7e
Gitweb: http://git.kernel.org/tip/293db47f4753f5746e5aaa998ceb24dff662cf7e
Author: Arnaldo Carvalho de Melo <acme@redhat.com>
AuthorDate: Wed, 25 Aug 2010 16:05:36 -0300
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Wed, 25 Aug 2010 16:05:36 -0300

perf hists browser: replace rb_first() != NULL by !RB_EMPTY_ROOT()

Its way too stupid to use rb_first() for just caching if there are
children, use the cheaper RB_EMPTY_ROOT() instead.

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/util/ui/browsers/hists.c | 14 +++++++-------
1 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/tools/perf/util/ui/browsers/hists.c b/tools/perf/util/ui/browsers/hists.c
index 39ba230..e61355e 100644
--- a/tools/perf/util/ui/browsers/hists.c
+++ b/tools/perf/util/ui/browsers/hists.c
@@ -129,16 +129,16 @@ static void callchain_node__init_have_children_rb_tree(struct callchain_node *se
for (nd = rb_first(&self->rb_root); nd; nd = rb_next(nd)) {
struct callchain_node *child = rb_entry(nd, struct callchain_node, rb_node);
struct callchain_list *chain;
- int first = true;
+ bool first = true;

list_for_each_entry(chain, &child->val, list) {
if (first) {
first = false;
chain->ms.has_children = chain->list.next != &child->val ||
- rb_first(&child->rb_root) != NULL;
+ !RB_EMPTY_ROOT(&child->rb_root);
} else
chain->ms.has_children = chain->list.next == &child->val &&
- rb_first(&child->rb_root) != NULL;
+ !RB_EMPTY_ROOT(&child->rb_root);
}

callchain_node__init_have_children_rb_tree(child);
@@ -150,7 +150,7 @@ static void callchain_node__init_have_children(struct callchain_node *self)
struct callchain_list *chain;

list_for_each_entry(chain, &self->val, list)
- chain->ms.has_children = rb_first(&self->rb_root) != NULL;
+ chain->ms.has_children = !RB_EMPTY_ROOT(&self->rb_root);

callchain_node__init_have_children_rb_tree(self);
}
@@ -301,11 +301,11 @@ static int hist_browser__show_callchain_node_rb_tree(struct hist_browser *self,
if (first) {
first = false;
chain->ms.has_children = chain->list.next != &child->val ||
- rb_first(&child->rb_root) != NULL;
+ !RB_EMPTY_ROOT(&child->rb_root);
} else {
extra_offset = LEVEL_OFFSET_STEP;
chain->ms.has_children = chain->list.next == &child->val &&
- rb_first(&child->rb_root) != NULL;
+ !RB_EMPTY_ROOT(&child->rb_root);
}

folded_sign = callchain_list__folded(chain);
@@ -381,7 +381,7 @@ static int hist_browser__show_callchain_node(struct hist_browser *self,
* probably when the callchain is created, so as not to
* traverse it all over again
*/
- chain->ms.has_children = rb_first(&node->rb_root) != NULL;
+ chain->ms.has_children = !RB_EMPTY_ROOT(&node->rb_root);
folded_sign = callchain_list__folded(chain);

if (*row_offset != 0) {