+ selftests-cgroup-fix-cg_run_in_subcgroups-ignoring-arg-parameter.patch added to mm-new branch

The patch titled
     Subject: selftests/cgroup: fix cg_run_in_subcgroups ignoring arg parameter
has been added to the -mm mm-new branch.  Its filename is
     selftests-cgroup-fix-cg_run_in_subcgroups-ignoring-arg-parameter.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/selftests-cgroup-fix-cg_run_in_subcgroups-ignoring-arg-parameter.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.

The mm-new branch of mm.git is not included in linux-next

If a few days of testing in mm-new is successful, the patch will me moved
into mm.git's mm-unstable branch, which is included in linux-next

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------------------------------------------------------
From: Hongfu Li <[email protected]>
Subject: selftests/cgroup: fix cg_run_in_subcgroups ignoring arg parameter
Date: Thu, 20 Aug 2026 15:09:44 +0800

cg_run_in_subcgroups() discards its arg and always passes NULL to
cg_run(), turning the (void *)100 from test_kmem_dead_cgroups() into NULL
so no allocation occurs.

This makes test_kmem_dead_cgroups() falsely pass without exercising the
"dying cgroup with charged slab" scenario it intends to test.

Pass the arg through to cg_run() to fix this.

Link: https://lore.kernel.org/[email protected]
Fixes: 933dc80ec262 ("kselftests: cgroup: add kernel memory accounting tests")
Signed-off-by: Hongfu Li <[email protected]>
Reviewed-by: Michal Koutný <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Muchun Song <[email protected]>
Cc: Roman Gushchin <[email protected]>
Cc: Shakeel Butt <[email protected]>
Cc: Shuah Khan <[email protected]>
Cc: Tejun Heo <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
---

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

--- a/tools/testing/selftests/cgroup/test_kmem.c~selftests-cgroup-fix-cg_run_in_subcgroups-ignoring-arg-parameter
+++ a/tools/testing/selftests/cgroup/test_kmem.c
@@ -145,7 +145,7 @@ static int cg_run_in_subcgroups(const ch
 			return -1;
 		}
 
-		if (cg_run(child, fn, NULL)) {
+		if (cg_run(child, fn, arg)) {
 			cg_destroy(child);
 			free(child);
 			return -1;
_

Patches currently in -mm which might be from [email protected] are

ksm-update-comments-and-docs-to-reference-folio-mapping.patch
selftests-mm-drop-duplicate-test_seal_mprotect_two_vma_with_gap-call.patch
selftests-mm-fix-read_file-return-value-check.patch
mm-swap-fix-swap_cluster_lock-config_swap-stub-signature-mismatch.patch
mm-cma-remove-stray-newline-from-auto-generated-cma-area-name.patch
selftests-mm-drop-redundant-open-in-mprotect_tests.patch
selftests-cgroup-fix-cg_run_in_subcgroups-ignoring-arg-parameter.patch