+ mm-swap-use-swp_solidstate-to-determine-if-swap-is-rotational.patch added to mm-new branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: mm, swap: use SWP_SOLIDSTATE to determine if swap is rotational
has been added to the -mm mm-new branch.  Its filename is
     mm-swap-use-swp_solidstate-to-determine-if-swap-is-rotational.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-swap-use-swp_solidstate-to-determine-if-swap-is-rotational.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
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------------------------------------------------------
From: Youngjun Park <youngjun.park@lge.com>
Subject: mm, swap: use SWP_SOLIDSTATE to determine if swap is rotational
Date: Fri, 31 Oct 2025 15:50:08 +0900

The current non rotational check is unreliable as the device's rotational
status can be changed by a user via sysfs.

Use the more reliable SWP_SOLIDSTATE flag which is set at swapon time, to
ensure the nr_rotate_swap count remains consistent.  Plus, it is easy to
read and simple.

Link: https://lkml.kernel.org/r/20251031065011.40863-3-youngjun.park@lge.com
Fixes: 81a0298bdfab ("mm, swap: don't use VMA based swap readahead if HDD is used as swap")
Signed-off-by: Youngjun Park <youngjun.park@lge.com>
Reviewed-by: Baoquan He <bhe@redhat.com>
Cc: Barry Song <baohua@kernel.org>
Cc: Chris Li <chrisl@kernel.org>
Cc: Kairui Song <kasong@tencent.com>
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-use-swp_solidstate-to-determine-if-swap-is-rotational
+++ a/mm/swapfile.c
@@ -2913,7 +2913,7 @@ SYSCALL_DEFINE1(swapoff, const char __us
 	if (p->flags & SWP_CONTINUED)
 		free_swap_count_continuations(p);
 
-	if (!p->bdev || !bdev_nonrot(p->bdev))
+	if (!(p->flags & SWP_SOLIDSTATE))
 		atomic_dec(&nr_rotate_swap);
 
 	mutex_lock(&swapon_mutex);
_

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

mm-swap-fix-memory-leak-in-setup_clusters-error-path.patch
mm-swap-use-swp_solidstate-to-determine-if-swap-is-rotational.patch
mm-swap-remove-redundant-comment-for-read_swap_cache_async.patch
mm-swap-change-swap_alloc_slow-to-void.patch
mm-swap-remove-scan_swap_map_slots-references-from-comments.patch