The quilt patch titled Subject: mm/rmap: cleanup partially-mapped handling in __folio_remove_rmap() has been removed from the -mm tree. Its filename was mm-rmap-cleanup-partially-mapped-handling-in-__folio_remove_rmap.patch This patch was dropped because it was merged into the mm-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm ------------------------------------------------------ From: David Hildenbrand <david@xxxxxxxxxx> Subject: mm/rmap: cleanup partially-mapped handling in __folio_remove_rmap() Date: Wed, 10 Jul 2024 23:43:50 +0200 Let's simplify and reduce code indentation. In the RMAP_LEVEL_PTE case, we already check for nr when computing partially_mapped. For RMAP_LEVEL_PMD, it's a bit more confusing. Likely, we don't need the "nr" check, but we could have "nr < nr_pmdmapped" also if we stumbled into the "/* Raced ahead of another remove and an add? */" case. So let's simply move the nr check in there. Note that partially_mapped is always false for small folios. No functional change intended. Link: https://lkml.kernel.org/r/20240710214350.147864-1-david@xxxxxxxxxx Signed-off-by: David Hildenbrand <david@xxxxxxxxxx> Reviewed-by: Zi Yan <ziy@xxxxxxxxxx> Reviewed-by: Yosry Ahmed <yosryahmed@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/rmap.c | 23 ++++++++++------------- 1 file changed, 10 insertions(+), 13 deletions(-) --- a/mm/rmap.c~mm-rmap-cleanup-partially-mapped-handling-in-__folio_remove_rmap +++ a/mm/rmap.c @@ -1568,22 +1568,19 @@ static __always_inline void __folio_remo } } - partially_mapped = nr < nr_pmdmapped; + partially_mapped = nr && nr < nr_pmdmapped; break; } - if (nr) { - /* - * Queue anon large folio for deferred split if at least one - * page of the folio is unmapped and at least one page - * is still mapped. - * - * Check partially_mapped first to ensure it is a large folio. - */ - if (folio_test_anon(folio) && partially_mapped && - list_empty(&folio->_deferred_list)) - deferred_split_folio(folio); - } + /* + * Queue anon large folio for deferred split if at least one page of + * the folio is unmapped and at least one page is still mapped. + * + * Check partially_mapped first to ensure it is a large folio. + */ + if (partially_mapped && folio_test_anon(folio) && + list_empty(&folio->_deferred_list)) + deferred_split_folio(folio); __folio_mod_stat(folio, -nr, -nr_pmdmapped); /* _ Patches currently in -mm which might be from david@xxxxxxxxxx are mm-rmap-use-folio-_mapcount-for-small-folios.patch mm-always-inline-_compound_head-with-config_hugetlb_page_optimize_vmemmap=y.patch selftests-mm-fix-charge_reserved_hugetlbsh-test.patch