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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. Signed-off-by: Martin Vuille <jpmv27@aim.com> Reviewed-by: Kim Phillips <kim.phillips@arm.com> Link: http://lkml.kernel.org/r/20180318175053.4222-1-jpmv27@aim.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -236,7 +236,8 @@ int unwind__get_entries(unwind_entry_cb_t cb, void *arg,
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if (err)
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goto out;
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if (!dwfl_attach_state(ui->dwfl, EM_NONE, thread->tid, &callbacks, ui))
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err = !dwfl_attach_state(ui->dwfl, EM_NONE, thread->tid, &callbacks, ui);
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if (err)
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goto out;
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err = dwfl_getthread_frames(ui->dwfl, thread->tid, frame_callback, ui);
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