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The page allocator uses page->lru for storing pages on either buddy or PCP lists. Create page->buddy_list and page->pcp_list as a union with page->lru. This is simply to clarify what type of list a page is on in the page allocator. No functional change intended. Signed-off-by: Mel Gorman <mgorman@techsingularity.net> Link: https://lore.kernel.org/all/20220420095906.27349-2-mgorman@techsingularity.net/ Bug: 230899966 Signed-off-by: Minchan Kim <minchan@google.com> Change-Id: Ieef253fa28c2a411008da64b38716f6401a66961