perf lock contention: Fix to save callstack for the default modified

The previous change missed to set the con->save_callstack for the
LOCK_AGGR_CALLER mode resulting in no caller information.

Fixes: ebab291 ("perf lock contention: Support filters for different aggregation")
Signed-off-by: Namhyung Kim <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Boqun Feng <[email protected]>
Cc: Davidlohr Bueso <[email protected]>
Cc: Hao Luo <[email protected]>
Cc: Ian Rogers <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Song Liu <[email protected]>
Cc: Waiman Long <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

Author: namhyung

tools/perf/builtin-lock.c

@@ -1806,6 +1806,9 @@ static int __cmd_contention(int argc, const char **argv)
 	con.aggr_mode = aggr_mode = show_thread_stats ? LOCK_AGGR_TASK :
 		show_lock_addrs ? LOCK_AGGR_ADDR : LOCK_AGGR_CALLER;
 
+	if (con.aggr_mode == LOCK_AGGR_CALLER)
+		con.save_callstack = true;
+
 	/* for lock function check */
 	symbol_conf.sort_by_name = true;
 	symbol_conf.allow_aliases = true;