The quilt patch titled Subject: selftests/mm: generate a temporary mountpoint for cgroup filesystem has been removed from the -mm tree. Its filename was selftests-mm-generate-a-temporary-mountpoint-for-cgroup-filesystem.patch
This patch was dropped because it was merged into the mm-hotfixes-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------ From: Mark Brown broonie@kernel.org Subject: selftests/mm: generate a temporary mountpoint for cgroup filesystem Date: Fri, 04 Apr 2025 17:42:32 +0100
Currently if the filesystem for the cgroups version it wants to use is not mounted charge_reserved_hugetlb.sh and hugetlb_reparenting_test.sh tests will attempt to mount it on the hard coded path /dev/cgroup/memory, deleting that directory when the test finishes. This will fail if there is not a preexisting directory at that path, and since the directory is deleted subsequent runs of the test will fail. Instead of relying on this hard coded directory name use mktemp to generate a temporary directory to use as a mountpoint, fixing both the assumption and the disruption caused by deleting a preexisting directory.
This means that if the relevant cgroup filesystem is not already mounted then we rely on having coreutils (which provides mktemp) installed. I suspect that many current users are relying on having things automounted by default, and given that the script relies on bash it's probably not an unreasonable requirement.
Link: https://lkml.kernel.org/r/20250404-kselftest-mm-cgroup2-detection-v1-1-3dba6... Fixes: 209376ed2a84 ("selftests/vm: make charge_reserved_hugetlb.sh work with existing cgroup setting") Signed-off-by: Mark Brown broonie@kernel.org Cc: Aishwarya TCV aishwarya.tcv@arm.com Cc: Mark Brown broonie@kernel.org Cc: Mina Almasry almasrymina@google.com Cc: Shuah Khan shuah@kernel.org Cc: Waiman Long longman@redhat.com Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---
tools/testing/selftests/mm/charge_reserved_hugetlb.sh | 4 ++-- tools/testing/selftests/mm/hugetlb_reparenting_test.sh | 2 +- 2 files changed, 3 insertions(+), 3 deletions(-)
--- a/tools/testing/selftests/mm/charge_reserved_hugetlb.sh~selftests-mm-generate-a-temporary-mountpoint-for-cgroup-filesystem +++ a/tools/testing/selftests/mm/charge_reserved_hugetlb.sh @@ -29,7 +29,7 @@ fi if [[ $cgroup2 ]]; then cgroup_path=$(mount -t cgroup2 | head -1 | awk '{print $3}') if [[ -z "$cgroup_path" ]]; then - cgroup_path=/dev/cgroup/memory + cgroup_path=$(mktemp -d) mount -t cgroup2 none $cgroup_path do_umount=1 fi @@ -37,7 +37,7 @@ if [[ $cgroup2 ]]; then else cgroup_path=$(mount -t cgroup | grep ",hugetlb" | awk '{print $3}') if [[ -z "$cgroup_path" ]]; then - cgroup_path=/dev/cgroup/memory + cgroup_path=$(mktemp -d) mount -t cgroup memory,hugetlb $cgroup_path do_umount=1 fi --- a/tools/testing/selftests/mm/hugetlb_reparenting_test.sh~selftests-mm-generate-a-temporary-mountpoint-for-cgroup-filesystem +++ a/tools/testing/selftests/mm/hugetlb_reparenting_test.sh @@ -23,7 +23,7 @@ fi if [[ $cgroup2 ]]; then CGROUP_ROOT=$(mount -t cgroup2 | head -1 | awk '{print $3}') if [[ -z "$CGROUP_ROOT" ]]; then - CGROUP_ROOT=/dev/cgroup/memory + CGROUP_ROOT=$(mktemp -d) mount -t cgroup2 none $CGROUP_ROOT do_umount=1 fi _
Patches currently in -mm which might be from broonie@kernel.org are