linux-kernel - [PATCH] perf: unwind: use the dwarf info only if loaded

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Date:	Mon, 16 Dec 2013 17:43:14 +0100
From:	Jean Pihet <jean.pihet@...aro.org>
To:	linux-kernel@...r.kernel.org, linaro-kernel@...ts.linaro.org,
	Jiri Olsa <jolsa@...hat.com>, Ingo Molnar <mingo@...nel.org>,
	Arnaldo <acme@...stprotocols.net>
Cc:	patches@...aro.org, Will Deacon <will.deacon@....com>,
	Jean Pihet <jean.pihet@...aro.org>
Subject: [PATCH] perf: unwind: use the dwarf info only if loaded

Use the info only if it has been found in the .debug_frame
section of the ELF binary.

Signed-off-by: Jean Pihet <jean.pihet@...aro.org>
---
 tools/perf/util/unwind.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/tools/perf/util/unwind.c b/tools/perf/util/unwind.c
index 0efd539..416f22b 100644
--- a/tools/perf/util/unwind.c
+++ b/tools/perf/util/unwind.c
@@ -340,10 +340,10 @@ find_proc_info(unw_addr_space_t as, unw_word_t ip, unw_proc_info_t *pi,
 	/* Check the .debug_frame section for unwinding info */
 	if (!read_unwind_spec_debug_frame(map->dso, ui->machine, &segbase)) {
 		memset(&di, 0, sizeof(di));
-		dwarf_find_debug_frame(0, &di, ip, 0, map->dso->name,
-				       map->start, map->end);
-		return dwarf_search_unwind_table(as, ip, &di, pi,
-						 need_unwind_info, arg);
+		if (dwarf_find_debug_frame(0, &di, ip, 0, map->dso->name,
+					   map->start, map->end))
+			return dwarf_search_unwind_table(as, ip, &di, pi,
+							 need_unwind_info, arg);
 	}
 #endif
 
-- 
1.7.11.7

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