linux-kernel - [PATCH] perf unwind: Report error from dwfl_attach

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Message-Id: <20180211205822.17080-1-jpmv27@aim.com>
Date:   Sun, 11 Feb 2018 15:58:22 -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: Report error from dwfl_attach_state

In verbose level 2, errors returned by libdw are reported in most cases,
but not when calling dwfl_attach_state.

Since elfutils v 0.160 (2014), dwfl_attach_state sets the error code to
report failure cause. On failure, log the reported error.
---
 tools/perf/util/unwind-libdw.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/unwind-libdw.c b/tools/perf/util/unwind-libdw.c
index 1e9c974faf67..967323c958fd 100644
--- a/tools/perf/util/unwind-libdw.c
+++ b/tools/perf/util/unwind-libdw.c
@@ -236,7 +236,8 @@ int unwind__get_entries(unwind_entry_cb_t cb, void *arg,
 	if (err)
 		goto out;
 
-	if (!dwfl_attach_state(ui->dwfl, EM_NONE, thread->tid, &callbacks, ui))
+	err = !dwfl_attach_state(ui->dwfl, EM_NONE, thread->tid, &callbacks, ui);
+	if (err)
 		goto out;
 
 	err = dwfl_getthread_frames(ui->dwfl, thread->tid, frame_callback, ui);
-- 
2.13.6