Re: [PATCH v8 1/5] mm: introduce a common interface for balloonpages mobility

[Peter Zijlstra]

On Tue, 2012-08-21 at 09:47 -0300, Rafael Aquini wrote:
> +       mapping = rcu_access_pointer(page->mapping);
> +       if (mapping)
> +               mapping = mapping->assoc_mapping; 

The comment near rcu_access_pointer() explicitly says:

 * Return the value of the specified RCU-protected pointer, but omit the
 * smp_read_barrier_depends() and keep the ACCESS_ONCE().  This is useful
 * when the value of this pointer is accessed, but the pointer is not
 * dereferenced,

Yet you dereference the pointer... smells like fail to me.
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