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Howlett" , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , linux-kernel@vger.kernel.org Subject: [PATCH v3 2/2] mm/huge_memory: use folio_expected_ref_count() to calculate ref_count. 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Suggested-by: David Hildenbrand Signed-off-by: Zi Yan Acked-by: Balbir Singh Acked-by: David Hildenbrand --- mm/huge_memory.c | 12 +++++------- 1 file changed, 5 insertions(+), 7 deletions(-) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index a7ee731f974f..31b5c4e61a57 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -3735,6 +3735,7 @@ static int __folio_split(struct folio *folio, unsigned int new_order, if (folio_ref_freeze(folio, 1 + extra_pins)) { struct address_space *swap_cache = NULL; struct lruvec *lruvec; + int expected_refs; if (folio_order(folio) > 1 && !list_empty(&folio->_deferred_list)) { @@ -3805,11 +3806,8 @@ static int __folio_split(struct folio *folio, unsigned int new_order, new_folio = next) { next = folio_next(new_folio); - folio_ref_unfreeze( - new_folio, - 1 + ((mapping || swap_cache) ? - folio_nr_pages(new_folio) : - 0)); + expected_refs = folio_expected_ref_count(new_folio) + 1; + folio_ref_unfreeze(new_folio, expected_refs); lru_add_split_folio(folio, new_folio, lruvec, list); @@ -3839,8 +3837,8 @@ static int __folio_split(struct folio *folio, unsigned int new_order, * Otherwise, a parallel folio_try_get() can grab origin_folio * and its caller can see stale page cache entries. */ - folio_ref_unfreeze(folio, 1 + - ((mapping || swap_cache) ? folio_nr_pages(folio) : 0)); + expected_refs = folio_expected_ref_count(folio) + 1; + folio_ref_unfreeze(folio, expected_refs); unlock_page_lruvec(lruvec); -- 2.47.2