On Fri, Sep 28, 2012 at 02:35:31PM +0200, Andrea Arcangeli wrote:

Speculative cache pagecache lookups can elevate the refcount from
under us, so avoid the false positive. If the refcount is < 2 we'll be
notified by a VM_BUG_ON in put_page_testzero as there are two
put_page(src_page) in a row before returning from this function.

Signed-off-by: Andrea Arcangeli <redacted>

Much better, thank you.

Reviewed-by: Johannes Weiner <hannes@cmpxchg.org>

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