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-rw-r--r--tools/perf/util/mem2node.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/tools/perf/util/mem2node.c b/tools/perf/util/mem2node.c
index c84f5841c7ab..03a7d7b27737 100644
--- a/tools/perf/util/mem2node.c
+++ b/tools/perf/util/mem2node.c
@@ -96,7 +96,8 @@ int mem2node__init(struct mem2node *map, struct perf_env *env)
/* Cut unused entries, due to merging. */
tmp_entries = realloc(entries, sizeof(*entries) * j);
- if (tmp_entries || WARN_ON_ONCE(j == 0))
+ if (tmp_entries ||
+ WARN_ONCE(j == 0, "No memory nodes, is CONFIG_MEMORY_HOTPLUG enabled?\n"))
entries = tmp_entries;
for (i = 0; i < j; i++) {