+ mm-swap-fix-wrong-plist-empty-check-in-swap_alloc_slow.patch added to mm-new branch

+ mm-swap-fix-wrong-plist-empty-check-in-swap_alloc_slow.patch added to mm-new branch

[Andrew Morton]

The patch titled
     Subject: mm/swap: fix wrong plist empty check in swap_alloc_slow()
has been added to the -mm mm-new branch.  Its filename is
     mm-swap-fix-wrong-plist-empty-check-in-swap_alloc_slow.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-swap-fix-wrong-plist-empty-check-in-swap_alloc_slow.patch

This patch will later appear in the mm-new branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Note, mm-new is a provisional staging ground for work-in-progress
patches, and acceptance into mm-new is a notification for others take
notice and to finish up reviews.  Please do not hesitate to respond to
review feedback and post updated versions to replace or incrementally
fixup patches in mm-new.

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   a) Consider who else should be cc'ed
   b) Prefer to cc a suitable mailing list as well
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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

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------------------------------------------------------
From: Youngjun Park <youngjun.park@lge.com>
Subject: mm/swap: fix wrong plist empty check in swap_alloc_slow()
Date: Wed, 19 Nov 2025 20:41:36 +0900

swap_alloc_slow() was checking `si->avail_list` instead of
`next->avail_list` when verifying if the next swap device is still in the
list, which could cause unnecessary restarts during allocation.

Link: https://lkml.kernel.org/r/20251119114136.594108-1-youngjun.park@lge.com
Fixes: 8e689f8ea45ff ("mm/swap: do not choose swap device according to numa node")
Signed-off-by: Youngjun Park <youngjun.park@lge.com>
Acked-by: Kairui Song <kasong@tencent.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Barry Song <baohua@kernel.org>
Cc: Chris Li <chrisl@kernel.org>
Cc: Kemeng Shi <shikemeng@huaweicloud.com>
Cc: Nhat Pham <nphamcs@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/swapfile.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/swapfile.c~mm-swap-fix-wrong-plist-empty-check-in-swap_alloc_slow
+++ a/mm/swapfile.c
@@ -1374,7 +1374,7 @@ start_over:
 		 * still in the swap_avail_head list then try it, otherwise
 		 * start over if we have not gotten any slots.
 		 */
-		if (plist_node_empty(&si->avail_list))
+		if (plist_node_empty(&next->avail_list))
 			goto start_over;
 	}
 	spin_unlock(&swap_avail_lock);
_

Patches currently in -mm which might be from youngjun.park@lge.com are

mm-swap-remove-duplicate-nr_swap_pages-decrement-in-get_swap_page_of_type.patch
mm-swap-fix-wrong-plist-empty-check-in-swap_alloc_slow.patch