[merged mm-stable] mm-huge_memory-add-a-comment-to-the-open-coded-swap-entry.patch removed from -mm tree

[merged mm-stable] mm-huge_memory-add-a-comment-to-the-open-coded-swap-entry.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm/huge_memory: add a comment to the open-coded swap entry
has been removed from the -mm tree.  Its filename was
     mm-huge_memory-add-a-comment-to-the-open-coded-swap-entry.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: Tal Zussman <tz2294@columbia.edu>
Subject: mm/huge_memory: add a comment to the open-coded swap entry
Date: Tue, 08 Sep 2026 11:16:32 -0400

The swap entry of each new folio in __split_folio_to_order() is computed
by hand from folio->swap rather than with folio_swap_entry(), because the
folio's page count is not valid while it is being split.  Add a comment
explaining this.

Link: https://lore.kernel.org/20260908-folio_swap_entry-v2-2-ee6d01dfa5e1@columbia.edu
Signed-off-by: Tal Zussman <tz2294@columbia.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Baoquan He <baoquan.he@linux.dev>
Cc: Barry Song <baohua@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Chengming Zhou <chengming.zhou@linux.dev>
Cc: Chris Li <chrisl@kernel.org>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Harry Yoo <harry@kernel.org>
Cc: Jann Horn <jannh@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Kairui Song <kasong@tencent.com>
Cc: Kemeng Shi <shikemeng@huaweicloud.com>
Cc: Kiryl Shutsemau <kas@kernel.org>
Cc: Lance Yang <lance.yang@linux.dev>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Marc Rutland <mark.rutland@arm.com>
Cc: Nhat Pham <nphamcs@gmail.com>
Cc: Rik van Riel <riel@surriel.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Cc: Will Deacon <will@kernel.org>
---

 mm/huge_memory.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/mm/huge_memory.c~mm-huge_memory-add-a-comment-to-the-open-coded-swap-entry
+++ a/mm/huge_memory.c
@@ -3762,6 +3762,10 @@ static void __split_folio_to_order(struc
 		 */
 		VM_WARN_ON_ONCE_PAGE(new_folio->private, new_head);
 
+		/*
+		 * Not all folio fields are valid during a split, so open-code
+		 * the swap entry rather than using folio_swap_entry().
+		 */
 		if (folio_test_swapcache(folio))
 			new_folio->swap.val = folio->swap.val + i;
 
_

Patches currently in -mm which might be from tz2294@columbia.edu are

mm-memcontrol-take-a-const-folio-in-folio_memcg-and-friends.patch
mm-memcontrol-constify-obj_cgroup_memcg-and-friends.patch
mm-memcontrol-constify-the-lruvec-helpers.patch
mm-page_io-take-a-const-folio-in-bio_associate_blkg_from_folio.patch
mm-memcontrol-constify-the-mem_cgroup-accessors.patch
mm-page_counter-constify-page_counter_read-and-page_counter_margin.patch
mm-memcontrol-constify-the-reclaim-protection-helpers.patch
mm-memcontrol-constify-the-memcg-and-lruvec-stat-readers.patch
mm-memcontrol-constify-the-swap-accounting-helpers.patch
mm-memcontrol-constify-mem_cgroup_swappiness-and-mem_cgroup_get_max.patch
mm-memcontrol-constify-the-zswap-and-socket-pressure-helpers.patch
vmcore-convert-mmap_vmcore_fault-to-use-folios.patch