+ selftests-mm-ksm_tests-skip-when-not-run-as-root.patch added to mm-new branch

+ selftests-mm-ksm_tests-skip-when-not-run-as-root.patch added to mm-new branch

[Andrew Morton]

The patch titled
     Subject: selftests/mm: ksm_tests: skip when not run as root
has been added to the -mm mm-new branch.  Its filename is
     selftests-mm-ksm_tests-skip-when-not-run-as-root.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/selftests-mm-ksm_tests-skip-when-not-run-as-root.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

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------------------------------------------------------
From: Sun Jian <sun.jian.kdev@gmail.com>
Subject: selftests/mm: ksm_tests: skip when not run as root
Date: Fri, 9 Jan 2026 17:43:13 +0800

ksm_tests writes KSM sysfs knobs under /sys/kernel/mm/ksm, which requires
root privileges.  When run unprivileged, it fails with permission errors
and reports FAIL, which is misleading.

Skip the test early when not run as root to avoid false failures.

Link: https://lkml.kernel.org/r/20260109094313.52307-1-sun.jian.kdev@gmail.com
Signed-off-by: Sun Jian <sun.jian.kdev@gmail.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: David Hildenbrand <david@kernel.org>
Cc: "Liam R. Howlett" <Liam.Howlett@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 tools/testing/selftests/mm/ksm_tests.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/tools/testing/selftests/mm/ksm_tests.c~selftests-mm-ksm_tests-skip-when-not-run-as-root
+++ a/tools/testing/selftests/mm/ksm_tests.c
@@ -766,6 +766,11 @@ int main(int argc, char *argv[])
 	bool merge_across_nodes = KSM_MERGE_ACROSS_NODES_DEFAULT;
 	long size_MB = 0;
 
+	if (geteuid() != 0) {
+		printf("# SKIP ksm_tests requires root privileges\n");
+		return KSFT_SKIP;
+	}
+
 	while ((opt = getopt(argc, argv, "dha:p:l:z:m:s:t:MUZNPCHD")) != -1) {
 		switch (opt) {
 		case 'a':
_

Patches currently in -mm which might be from sun.jian.kdev@gmail.com are

selftests-mm-ksm_tests-skip-when-not-run-as-root.patch