+#ifdef CONFIG_COHERENT_DEVICE
+#define node_cdm(nid)          (NODE_DATA(nid)->coherent_device)
+#define set_cdm_isolation(nid) (node_cdm(nid) = 1)
+#define clr_cdm_isolation(nid) (node_cdm(nid) = 0)
+#define isolated_cdm_node(nid) (node_cdm(nid) == 1)
+#else
+#define set_cdm_isolation(nid) ()
+#define clr_cdm_isolation(nid) ()
+#define isolated_cdm_node(nid) (0)
+#endif

FWIW, I think adding all this "cdm" gunk in the names is probably a bad
thing.

I can think of other memory types that are coherent, but
non-device-based that might want behavior like this.

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