The test_core will skip the
test_cgcore_no_internal_process_constraint_on_threads test case if the
'cpu' controller missing in root's subtree_control. In fact we need to
set the 'cpu' in subtree_control, to make the testing meaningful.

./test_core
...
ok 4 # skip test_cgcore_no_internal_process_constraint_on_threads
...

Signed-off-by: Alex Shi <alex....@linux.alibaba.com>
Cc: Shuah Khan <sh...@kernel.org>
Cc: Tejun Heo <t...@kernel.org>
Cc: Roman Gushchin <g...@fb.com>
Cc: Claudio Zumbo <claud...@fb.com>
Cc: Claudio <claudiozu...@gmail.com>
Cc: linux-kselft...@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Reviewed-by: Roman Gushchin <g...@fb.com>
---
 tools/testing/selftests/cgroup/test_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/cgroup/test_core.c 
b/tools/testing/selftests/cgroup/test_core.c
index b1a570d7c557..2ffc3e07d98d 100644
--- a/tools/testing/selftests/cgroup/test_core.c
+++ b/tools/testing/selftests/cgroup/test_core.c
@@ -198,7 +198,7 @@ static int 
test_cgcore_no_internal_process_constraint_on_threads(const char *roo
        char *parent = NULL, *child = NULL;
 
        if (cg_read_strstr(root, "cgroup.controllers", "cpu") ||
-           cg_read_strstr(root, "cgroup.subtree_control", "cpu")) {
+           cg_write(root, "cgroup.subtree_control", "+cpu")) {
                ret = KSFT_SKIP;
                goto cleanup;
        }
-- 
2.19.1.856.g8858448bb

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