[to-be-updated] selftests-cgroup-test_zswap-skip-test_no_kmem_bypass-if-debugfs-is-unavailable.patch removed from -mm tree

[to-be-updated] selftests-cgroup-test_zswap-skip-test_no_kmem_bypass-if-debugfs-is-unavailable.patch removed from -mm tree

[Andrew Morton]

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The quilt patch titled
     Subject: selftests/cgroup: test_zswap: skip test_no_kmem_bypass if debugfs is unavailable
has been removed from the -mm tree.  Its filename was
     selftests-cgroup-test_zswap-skip-test_no_kmem_bypass-if-debugfs-is-unavailable.patch

This patch was dropped because an updated version will be issued

------------------------------------------------------
From: Wilson Felipe Pereira <wfelipe@google.com>
Subject: selftests/cgroup: test_zswap: skip test_no_kmem_bypass if debugfs is unavailable
Date: Sat, 1 Aug 2026 04:12:46 +0000

test_no_kmem_bypass() needs to read /sys/kernel/debug/zswap/stored_pages
via get_zswap_stored_pages() to verify that compressed pages are charged
to the memcg.

When running in an environment where debugfs is not mounted or
CONFIG_DEBUG_FS is disabled, get_zswap_stored_pages() fails, causing the
loop to terminate early and report a false negative (KSFT_FAIL).

Selftests should not fail when if debugfs is unavailable, and it should
print a message when it is skipped.

Link: https://lore.kernel.org/20260801041255.752039-1-wfelipe@google.com
Signed-off-by: Wilson Felipe Pereira <wfelipe@google.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Chengming Zhou <chengming.zhou@linux.dev>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Koutný <mkoutny@suse.com>
Cc: Nhat Pham <nphamcs@gmail.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 tools/testing/selftests/cgroup/test_zswap.c |   10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

--- a/tools/testing/selftests/cgroup/test_zswap.c~selftests-cgroup-test_zswap-skip-test_no_kmem_bypass-if-debugfs-is-unavailable
+++ a/tools/testing/selftests/cgroup/test_zswap.c
@@ -566,12 +566,19 @@ static int test_no_kmem_bypass(const cha
 	int child_status;
 	char *test_group = NULL;
 	pid_t child_pid;
+	size_t stored_pages;
 
 	/* Read sys info and compute test values accordingly */
 	if (sysinfo(&sys_info) != 0)
 		return KSFT_FAIL;
-	if (sys_info.totalram > 5000000000)
+	if (sys_info.totalram > 5000000000) {
+		ksft_print_msg("requires less than 5000000000 total ram\n");
 		return KSFT_SKIP;
+	}
+	if (get_zswap_stored_pages(&stored_pages)) {
+		ksft_print_msg("debugfs at /sys/kernel/debug is required\n");
+		return KSFT_SKIP;
+	}
 	values = mmap(0, sizeof(struct no_kmem_bypass_child_args), PROT_READ |
 			PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, -1, 0);
 	if (values == MAP_FAILED)
@@ -604,7 +611,6 @@ static int test_no_kmem_bypass(const cha
 	/* Try to wakeup kswapd and let it push child memory to zswap */
 	set_min_free_kb(min_free_kb_high);
 	for (int i = 0; i < 20; i++) {
-		size_t stored_pages;
 		char *trigger_allocation = malloc(trigger_allocation_size);
 
 		if (!trigger_allocation)
_

Patches currently in -mm which might be from wfelipe@google.com are

mm-zswap-drop-list_lru-param-from-zswap_lru_add-and-_del.patch