Instead of directly accessing static deferred_pages, replace such instances
with the helper deferred_pages_enabled(). No functional change is intended.
Cc; Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: linux-mm@xxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Signed-off-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>
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