[merged mm-stable] mm-huge_memory-avoid-reinvoking-folio_test_anon.patch removed from -mm tree

[merged mm-stable] mm-huge_memory-avoid-reinvoking-folio_test_anon.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm/huge_memory: avoid reinvoking folio_test_anon()
has been removed from the -mm tree.  Its filename was
     mm-huge_memory-avoid-reinvoking-folio_test_anon.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: Wei Yang <richard.weiyang@gmail.com>
Subject: mm/huge_memory: avoid reinvoking folio_test_anon()
Date: Tue, 21 Oct 2025 21:21:39 +0000

Patch series "mm/huge_memory: cleanup __split_unmapped_folio()", v3.

This patch series cleans up and optimizes the internal logic of the
__split_unmapped_folio() function.

The goal is to improve clarity and efficiency by eliminating redundant
checks, caching stable attribute values, and simplifying the iteration
logic used for updating folio statistics.

These changes make the code easier to follow and maintain.

The split_huge_page_test selftest pass.


This patch (of 4):

During the execution of __split_unmapped_folio(), the folio's anon/!anon
attribute is invariant (not expected to change).

Therefore, it is safe and more efficient to retrieve this attribute once
at the start and reuse it throughout the function.

Link: https://lkml.kernel.org/r/20251021212142.25766-1-richard.weiyang@gmail.com
Link: https://lkml.kernel.org/r/20251016004613.514-1-richard.weiyang@gmail.com
Link: https://lkml.kernel.org/r/20251016004613.514-2-richard.weiyang@gmail.com
Link: https://lkml.kernel.org/r/20251021212142.25766-2-richard.weiyang@gmail.com
Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Reviewed-by: wang lian <lianux.mm@gmail.com>
Reviewed-by: Barry Song <baohua@kernel.org>
Acked-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Lance Yang <lance.yang@linux.dev>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Mariano Pache <npache@redhat.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Nico Pache <npache@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/huge_memory.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

--- a/mm/huge_memory.c~mm-huge_memory-avoid-reinvoking-folio_test_anon
+++ a/mm/huge_memory.c
@@ -3401,6 +3401,7 @@ static int __split_unmapped_folio(struct
 		struct page *split_at, struct xa_state *xas,
 		struct address_space *mapping, bool uniform_split)
 {
+	const bool is_anon = folio_test_anon(folio);
 	int order = folio_order(folio);
 	int start_order = uniform_split ? new_order : order - 1;
 	bool stop_split = false;
@@ -3408,7 +3409,7 @@ static int __split_unmapped_folio(struct
 	int split_order;
 	int ret = 0;
 
-	if (folio_test_anon(folio))
+	if (is_anon)
 		mod_mthp_stat(order, MTHP_STAT_NR_ANON, -1);
 
 	/*
@@ -3423,7 +3424,7 @@ static int __split_unmapped_folio(struct
 		struct folio *new_folio;
 
 		/* order-1 anonymous folio is not supported */
-		if (folio_test_anon(folio) && split_order == 1)
+		if (is_anon && split_order == 1)
 			continue;
 		if (uniform_split && split_order != new_order)
 			continue;
@@ -3475,7 +3476,7 @@ static int __split_unmapped_folio(struct
 				if (split_order != new_order && !stop_split)
 					continue;
 			}
-			if (folio_test_anon(new_folio))
+			if (is_anon)
 				mod_mthp_stat(folio_order(new_folio),
 					      MTHP_STAT_NR_ANON, 1);
 		}
_

Patches currently in -mm which might be from richard.weiyang@gmail.com are

mm-huge_memory-add-pmd-folio-to-ds_queue-in-do_huge_zero_wp_pmd.patch
mm-khugepaged-unify-pmd-folio-installation-with-map_anon_folio_pmd.patch
mm-huge_memory-only-get-folio_order-once-during-__folio_split.patch
mm-huge_memory-introduce-enum-split_type-for-clarity.patch
mm-huge_memory-merge-uniform_split_supported-and-non_uniform_split_supported.patch
mm-khugepaged-remove-redundant-clearing-of-struct-collapse_control.patch
mm-khugepaged-continue-to-collapse-on-scan_pmd_none.patch
mm-khugepaged-unify-scan_pmd_none-and-scan_pmd_null-into-scan_no_pte_table.patch