linux-kernel - [PATCH] perf unwind: Unwind with libdw doesn't take symfs into account

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Date:   Sun, 11 Feb 2018 16:24:20 -0500
From:   Martin Vuille <jpmv27@....com>
To:     Arnaldo Carvalho de Melo <acme@...hat.com>
Cc:     linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] perf unwind: Unwind with libdw doesn't take symfs into account

Path passed to libdw for unwinding doesn't include symfs path
if specified, so unwinding fails because ELF file is not found.

Similar to unwinding with libunwind, pass symsrc_filename instead
of long_name. If there is no symsrc_filename, fallback to long_name.

Signed-off-by: Martin Vuille <jpmv27@....com>
---
 tools/perf/util/unwind-libdw.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/unwind-libdw.c b/tools/perf/util/unwind-libdw.c
index 967323c958fd..7bdd239c795c 100644
--- a/tools/perf/util/unwind-libdw.c
+++ b/tools/perf/util/unwind-libdw.c
@@ -50,7 +50,7 @@ static int __report_module(struct addr_location *al, u64 ip,
 
 	if (!mod)
 		mod = dwfl_report_elf(ui->dwfl, dso->short_name,
-				      dso->long_name, -1, al->map->start,
+				      (dso->symsrc_filename ? dso->symsrc_filename : dso->long_name), -1, al->map->start,
 				      false);
 
 	return mod && dwfl_addrmodule(ui->dwfl, ip) == mod ? 0 : -1;
-- 
2.13.6