[merged mm-stable] selftests-cgroup-use-runtime-page-size-for-zswpin-check.patch removed from -mm tree

[merged mm-stable] selftests-cgroup-use-runtime-page-size-for-zswpin-check.patch removed from -mm tree

[Andrew Morton]

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The quilt patch titled
     Subject: selftests/cgroup: use runtime page size for zswpin check
has been removed from the -mm tree.  Its filename was
     selftests-cgroup-use-runtime-page-size-for-zswpin-check.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: Li Wang <li.wang@linux.dev>
Subject: selftests/cgroup: use runtime page size for zswpin check
Date: Fri, 24 Apr 2026 12:00:54 +0800

test_zswapin compares memory.stat:zswpin (counted in pages) against a byte
threshold converted with PAGE_SIZE.  In cgroup selftests, PAGE_SIZE is
hardcoded to 4096, which makes the conversion wrong on systems with non-4K
base pages (e.g.  64K).

As a result, the test requires too many pages to pass and fails spuriously
even when zswap is working.

Use sysconf(_SC_PAGESIZE) for the zswpin threshold conversion so the check
matches the actual system page size.

Link: https://lore.kernel.org/20260424040059.12940-4-li.wang@linux.dev
Signed-off-by: Li Wang <li.wang@linux.dev>
Reviewed-by: Yosry Ahmed <yosry@kernel.org>
Acked-by: Nhat Pham <nphamcs@gmail.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Michal Koutný <mkoutny@suse.com>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Tejun Heo <tj@kernel.org>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Shakeel Butt <shakeel.butt@linux.dev>
Cc: Chengming Zhou <chengming.zhou@linux.dev>
Cc: Jiayuan Chen <jiayuan.chen@linux.dev>
Cc: Waiman Long <longman@redhat.com>
Cc: Yosry Ahmed <yosryahmed@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 tools/testing/selftests/cgroup/test_zswap.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/tools/testing/selftests/cgroup/test_zswap.c~selftests-cgroup-use-runtime-page-size-for-zswpin-check
+++ a/tools/testing/selftests/cgroup/test_zswap.c
@@ -245,7 +245,7 @@ static int test_zswapin(const char *root
 		goto out;
 	}
 
-	if (zswpin < MB(24) / PAGE_SIZE) {
+	if (zswpin < MB(24) / sysconf(_SC_PAGESIZE)) {
 		ksft_print_msg("at least 24MB should be brought back from zswap\n");
 		goto out;
 	}
_

Patches currently in -mm which might be from li.wang@linux.dev are