+ cgroup-kselftest-relax-fs_spec-checks.patch added to -mm tree

+ cgroup-kselftest-relax-fs_spec-checks.patch added to -mm tree

[akpm]

The patch titled
     Subject: cgroup: kselftest: relax fs_spec checks
has been added to the -mm tree.  Its filename is
     cgroup-kselftest-relax-fs_spec-checks.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/cgroup-kselftest-relax-fs_spec-checks.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/cgroup-kselftest-relax-fs_spec-checks.patch

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------------------------------------------------------
From: Chris Down <chris@chrisdown.name>
Subject: cgroup: kselftest: relax fs_spec checks

On my laptop most memcg kselftests were being skipped because it claimed
cgroup v2 hierarchy wasn't mounted, but this isn't correct.  Instead, it
seems current systemd HEAD mounts it with the name "cgroup2" instead of
"cgroup":

    % grep cgroup /proc/mounts
    cgroup2 /sys/fs/cgroup cgroup2 rw,nosuid,nodev,noexec,relatime,nsdelegate 0 0

I can't think of a reason to need to check fs_spec explicitly
since it's arbitrary, so we can just rely on fs_vfstype.

After these changes, `make TARGETS=cgroup kselftest` actually runs the
cgroup v2 tests in more cases.

Link: http://lkml.kernel.org/r/20190723210737.GA487@chrisdown.name
Signed-off-by: Chris Down <chris@chrisdown.name>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Roman Gushchin <guro@fb.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 tools/testing/selftests/cgroup/cgroup_util.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/tools/testing/selftests/cgroup/cgroup_util.c~cgroup-kselftest-relax-fs_spec-checks
+++ a/tools/testing/selftests/cgroup/cgroup_util.c
@@ -191,8 +191,7 @@ int cg_find_unified_root(char *root, siz
 		strtok(NULL, delim);
 		strtok(NULL, delim);
 
-		if (strcmp(fs, "cgroup") == 0 &&
-		    strcmp(type, "cgroup2") == 0) {
+		if (strcmp(type, "cgroup2") == 0) {
 			strncpy(root, mount, len);
 			return 0;
 		}
_

Patches currently in -mm which might be from chris@chrisdown.name are

cgroup-kselftest-relax-fs_spec-checks.patch
mm-throttle-allocators-when-failing-reclaim-over-memoryhigh.patch
mm-proportional-memorylowmin-reclaim.patch
mm-make-memoryemin-the-baseline-for-utilisation-determination.patch
mm-make-memoryemin-the-baseline-for-utilisation-determination-fix.patch