mm: export split_page()
This symbol will be used in the Hyper-V balloon driver to support 2M allocations. Signed-off-by: NK. Y. Srinivasan <kys@microsoft.com> Acked-by: NMichal Hocko <mhocko@suse.cz> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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