The page_ext_next() function assumes that page extension objects for a
page order allocation always reside in the same memory section, which
may not be true and could lead to crashes. Use the page_ext_iter API
instead.
Fixes: e98337d11bbd ("mm/contig_alloc: support __GFP_COMP")
Signed-off-by: Luiz Capitulino <luizcap@xxxxxxxxxx>
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