[PATCH] perf tools: Fix "Command" sort_entry's cmp and collapse function

[Jiri Olsa <jolsa@kernel.org>]

Currently the se_cmp and se_collapse use pointer comparison,
which is ok for for testing equality of strings. It's not ok
as comparing function for rbtree insertion, because it gives
different results based on current pointer values.

We saw test 32 (hists cumulation test) failing based on different
environment setup. Having all sort functions straightened fix the
test for us.

Reported-by: Jan Stancek <jstancek@redhat.com>
Link: http://lkml.kernel.org/n/tip-tklp6y27bseqjibcwn0py9up@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
 tools/perf/util/sort.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
index 4593f36ecc4c..09d4696fd9a1 100644
--- a/tools/perf/util/sort.c
+++ b/tools/perf/util/sort.c
@@ -89,14 +89,14 @@ static int64_t
 sort__comm_cmp(struct hist_entry *left, struct hist_entry *right)
 {
 	/* Compare the addr that should be unique among comm */
-	return comm__str(right->comm) - comm__str(left->comm);
+	return strcmp(comm__str(right->comm), comm__str(left->comm));
 }
 
 static int64_t
 sort__comm_collapse(struct hist_entry *left, struct hist_entry *right)
 {
 	/* Compare the addr that should be unique among comm */
-	return comm__str(right->comm) - comm__str(left->comm);
+	return strcmp(comm__str(right->comm), comm__str(left->comm));
 }
 
 static int64_t
-- 
1.9.3