quoted

  PAGEFLAG(MovableOps, movable_ops, PF_NO_TAIL);
+/*
+ * A movable_ops page has this flag set while it is isolated for migration.
+ * This flag primarily protects against concurrent migration attempts.
+ *
+ * Once migration ended (success or failure), the flag is cleared. The
+ * flag is managed by the migration core.
+ */
+PAGEFLAG(MovableOpsIsolated, movable_ops_isolated, PF_NO_TAIL);
  #else
  PAGEFLAG_FALSE(MovableOps, movable_ops);
+PAGEFLAG_FALSE(MovableOpsIsolated, movable_ops_isolated);
  #endif

Nit, but maybe worth sticking /* CONFIG_MIGRATION */ on else and endif? Not a
huge block so maybe not massively important but just a thought!

Sure, why not (goes into the introducing patch) :)


-- 
Cheers,

David / dhildenb