On arm64, enable dwarf_callchain_users which will be needed
to do a dwarf unwind in order to get the caller of the leaf frame.

Signed-off-by: Alexandre Truong <redacted>
Cc: John Garry <redacted>
Cc: Will Deacon <will@kernel.org>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Leo Yan <redacted>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <redacted>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Kemeng Shi <redacted>
Cc: Ian Rogers <irogers@google.com>
Cc: Andi Kleen <redacted>
Cc: Kan Liang <redacted>
Cc: Jin Yao <redacted>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Al Grant <redacted>
Cc: James Clark <redacted>
Cc: Wilco Dijkstra <redacted>
---
 tools/perf/builtin-report.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 2a845d6cac09..93661a3eaeb1 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c

@@ -405,6 +405,10 @@ static int report__setup_sample_type(struct report *rep)
 
 	callchain_param_setup(sample_type);
 
+	if (callchain_param.record_mode == CALLCHAIN_FP &&
+			strncmp(rep->session->header.env.arch, "aarch64", 7) == 0)
+		dwarf_callchain_users = true;
+
 	if (rep->stitch_lbr && (callchain_param.record_mode != CALLCHAIN_LBR)) {
 		ui__warning("Can't find LBR callchain. Switch off --stitch-lbr.\n"
 			    "Please apply --call-graph lbr when recording.\n");

-- 
2.23.0