Xen devel - Jan 2009 - [PATCH] PoD: Check refcount, not type count when reclaiming zero pages

Check the page refcount rather than the type count when deciding if a
page is still mapped.

This catches pages which are mapped by qemu; it also removes the need
for gnttab_is_granted().

Signed-off-by: George Dunlap <george.dunlap@eu.citrix.com>


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