4.9-stable patches

[thirdparty/kernel/stable-queue.git] / releases / 2.6.32.17 / perf-resurrect-flat-callchains.patch

From 97aa1052739c6a06cb6b0467dbf410613d20bc97 Mon Sep 17 00:00:00 2001
From: Frederic Weisbecker <fweisbec@gmail.com>
Date: Thu, 8 Jul 2010 06:06:17 +0200
Subject: perf: Resurrect flat callchains

From: Frederic Weisbecker <fweisbec@gmail.com>

commit 97aa1052739c6a06cb6b0467dbf410613d20bc97 upstream.

Initialize the callchain radix tree root correctly.

When we walk through the parents, we must stop after the root, but
since it wasn't well initialized, its parent pointer was random.

Also the number of hits was random because uninitialized, hence it
was part of the callchain while the root doesn't contain anything.

This fixes segfaults and percentages followed by empty callchains
while running:

	perf report -g flat

Reported-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 tools/perf/util/callchain.h |    3 +++
 1 file changed, 3 insertions(+)

--- a/tools/perf/util/callchain.h
+++ b/tools/perf/util/callchain.h
@@ -48,6 +48,9 @@ static inline void callchain_init(struct
 	INIT_LIST_HEAD(&node->brothers);
 	INIT_LIST_HEAD(&node->children);
 	INIT_LIST_HEAD(&node->val);
+
+	node->parent = NULL;
+	node->hit = 0;
 }
 
 static inline u64 cumul_hits(struct callchain_node *node)