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mm: numa: cleanup flow of transhuge page migration
When correcting commit 04fa5d6 ("mm: migrate: check page_count of THP before migrating") Hugh Dickins noted that the control flow for transhuge migration was difficult to follow. Unconditionally calling put_page() in numamigrate_isolate_page() made the failure paths of both migrate_misplaced_transhuge_page() and migrate_misplaced_page() more complex that they should be. Further, he was extremely wary that an unlock_page() should ever happen after a put_page() even if the put_page() should never be the final put_page. Hugh implemented the following cleanup to simplify the path by calling putback_lru_page() inside numamigrate_isolate_page() if it failed to isolate and always calling unlock_page() within migrate_misplaced_transhuge_page(). There is no functional change after this patch is applied but the code is easier to follow and unlock_page() always happens before put_page(). [[email protected]: changelog only] Signed-off-by: Mel Gorman <[email protected]> Signed-off-by: Hugh Dickins <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Andrea Arcangeli <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Simon Jeons <[email protected]> Cc: Wanpeng Li <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
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