[merged mm-stable] mm-swap-replace-cluster_swap_free_nr-with-swap_entries_put_.patch removed from -mm tree

[merged mm-stable] mm-swap-replace-cluster_swap_free_nr-with-swap_entries_put_.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm: swap: replace cluster_swap_free_nr() with swap_entries_put_[map/cache]()
has been removed from the -mm tree.  Its filename was
     mm-swap-replace-cluster_swap_free_nr-with-swap_entries_put_.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: Kemeng Shi <shikemeng@huaweicloud.com>
Subject: mm: swap: replace cluster_swap_free_nr() with swap_entries_put_[map/cache]()
Date: Wed, 26 Mar 2025 00:25:28 +0800

Replace cluster_swap_free_nr() with swap_entries_put_[map/cache]() to
remove repeat code and leverage batch-remove for entries with last flag. 
After removing cluster_swap_free_nr, only functions with "_nr" suffix
could free entries spanning cross clusters.  Add corresponding description
in comment of swap_entries_put_map_nr() as is first function with "_nr"
suffix and have a non-suffix variant function swap_entries_put_map().

Link: https://lkml.kernel.org/r/20250325162528.68385-9-shikemeng@huaweicloud.com
Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Reviewed-by: Tim Chen <tim.c.chen@linux.intel.com>
Reviewed-by: Baoquan He <bhe@redhat.com>
Cc: Kairui Song <kasong@tencent.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/swapfile.c |   30 +++++++++++-------------------
 1 file changed, 11 insertions(+), 19 deletions(-)

--- a/mm/swapfile.c~mm-swap-replace-cluster_swap_free_nr-with-swap_entries_put_
+++ a/mm/swapfile.c
@@ -1520,6 +1520,11 @@ locked_fallback:
 
 }
 
+/*
+ * Only functions with "_nr" suffix are able to free entries spanning
+ * cross multi clusters, so ensure the range is within a single cluster
+ * when freeing entries with functions without "_nr" suffix.
+ */
 static bool swap_entries_put_map_nr(struct swap_info_struct *si,
 				    swp_entry_t entry, int nr)
 {
@@ -1581,21 +1586,6 @@ static void swap_entries_free(struct swa
 		partial_free_cluster(si, ci);
 }
 
-static void cluster_swap_free_nr(struct swap_info_struct *si,
-		unsigned long offset, int nr_pages,
-		unsigned char usage)
-{
-	struct swap_cluster_info *ci;
-	unsigned long end = offset + nr_pages;
-
-	ci = lock_cluster(si, offset);
-	do {
-		swap_entry_put_locked(si, ci, swp_entry(si->type, offset),
-				      usage);
-	} while (++offset < end);
-	unlock_cluster(ci);
-}
-
 /*
  * Caller has made sure that the swap device corresponding to entry
  * is still around or has not been recycled.
@@ -1612,7 +1602,7 @@ void swap_free_nr(swp_entry_t entry, int
 
 	while (nr_pages) {
 		nr = min_t(int, nr_pages, SWAPFILE_CLUSTER - offset % SWAPFILE_CLUSTER);
-		cluster_swap_free_nr(sis, offset, nr, 1);
+		swap_entries_put_map(sis, swp_entry(sis->type, offset), nr);
 		offset += nr;
 		nr_pages -= nr;
 	}
@@ -3658,11 +3648,13 @@ int swapcache_prepare(swp_entry_t entry,
 	return __swap_duplicate(entry, SWAP_HAS_CACHE, nr);
 }
 
+/*
+ * Caller should ensure entries belong to the same folio so
+ * the entries won't span cross cluster boundary.
+ */
 void swapcache_clear(struct swap_info_struct *si, swp_entry_t entry, int nr)
 {
-	unsigned long offset = swp_offset(entry);
-
-	cluster_swap_free_nr(si, offset, nr, SWAP_HAS_CACHE);
+	swap_entries_put_cache(si, entry, nr);
 }
 
 struct swap_info_struct *swp_swap_info(swp_entry_t entry)
_

Patches currently in -mm which might be from shikemeng@huaweicloud.com are