On Mon, 2012-09-17 at 13:38 -0300, Rafael Aquini wrote:

+static inline void assign_balloon_mapping(struct page *page,
+                                         struct address_space
*mapping)
+{
+       page->mapping = mapping;
+       smp_wmb();
+}
+
+static inline void clear_balloon_mapping(struct page *page)
+{
+       page->mapping = NULL;
+       smp_wmb();
+} 

barriers without a comment describing the data race are a mortal sin.

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