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-rw-r--r--kernel/cgroup/debug.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/cgroup/debug.c b/kernel/cgroup/debug.c
index 1c209aa43733..cbe77a2087c5 100644
--- a/kernel/cgroup/debug.c
+++ b/kernel/cgroup/debug.c
@@ -1,3 +1,9 @@
+/*
+ * Debug controller
+ *
+ * WARNING: This controller is for cgroup core debugging only.
+ * Its interfaces are unstable and subject to changes at any time.
+ */
#include <linux/ctype.h>
#include <linux/mm.h>
#include <linux/slab.h>
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