[PATCH 06/16] perf tools: Fix dwarf unwind max_stack processing

[Jiri Olsa <jolsa@redhat.com>]

The 'unwind__get_entries' function currently returns
'max_stack + 1' entries (instead of exact max_stack
entries), because max_stack value does not get
decremented for the first entry.

This fix makes dwarf-unwind test pass.

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jean Pihet <jean.pihet@linaro.org>
---
 tools/perf/util/unwind.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/unwind.c b/tools/perf/util/unwind.c
index 0efd539..87509d8 100644
--- a/tools/perf/util/unwind.c
+++ b/tools/perf/util/unwind.c
@@ -611,5 +611,5 @@ int unwind__get_entries(unwind_entry_cb_t cb, void *arg,
 	if (ret)
 		return -ENOMEM;
 
-	return get_entries(&ui, cb, arg, max_stack);
+	return --max_stack > 0 ? get_entries(&ui, cb, arg, max_stack) : 0;
 }
-- 
1.8.3.1