linux-kernel - [PATCH v1 03/15] perf, tools, stat: Fix saved values rbtree lookup

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Date:   Mon, 24 Jul 2017 16:40:03 -0700
From:   Andi Kleen <andi@...stfloor.org>
To:     acme@...nel.org
Cc:     jolsa@...nel.org, linux-kernel@...r.kernel.org,
        Andi Kleen <ak@...ux.intel.com>
Subject: [PATCH v1 03/15] perf, tools, stat: Fix saved values rbtree lookup

From: Andi Kleen <ak@...ux.intel.com>

The stat shadow saved values rbtree is indexed by a pointer.
Fix the comparison function:

- We cannot return a pointer delta as an int because
that loses bits on 64bit.
- Doing pointer arithmetic on the struct pointer
only works if the objects are spaced by the multiple
of the object size, which is not guaranteed for individual
malloc'ed object

Replace it with a proper comparison.

This fixes various problems with values not being found.

Signed-off-by: Andi Kleen <ak@...ux.intel.com>
---
 tools/perf/util/stat-shadow.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/stat-shadow.c b/tools/perf/util/stat-shadow.c
index 719d6cb86952..a04cf56d3517 100644
--- a/tools/perf/util/stat-shadow.c
+++ b/tools/perf/util/stat-shadow.c
@@ -70,7 +70,11 @@ static int saved_value_cmp(struct rb_node *rb_node, const void *entry)
 		return a->ctx - b->ctx;
 	if (a->cpu != b->cpu)
 		return a->cpu - b->cpu;
-	return a->evsel - b->evsel;
+	if (a->evsel == b->evsel)
+		return 0;
+	if ((char *)a->evsel < (char *)b->evsel)
+		return -1;
+	return +1;
 }
 
 static struct rb_node *saved_value_new(struct rblist *rblist __maybe_unused,
-- 
2.9.4