perf: Resurrect flat callchains

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>

diff --git a/tools/perf/util/callchain.h b/tools/perf/util/callchain.h
index 43cf3ea9e088fd86953637450036ecb56f3964fd..a31a8cd67570384be6b622c8e643c5f46a79d566 100644 (file)
--- a/tools/perf/util/callchain.h
+++ b/tools/perf/util/callchain.h
@@ -48,6 +48,9 @@ static inline void callchain_init(struct callchain_node *node)
        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)