linux-kernel - [PATCH 3/3] kselftest/cgroup: fix incorrect test

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Date:   Wed, 15 May 2019 17:07:04 +0800
From:   Alex Shi <alex.shi@...ux.alibaba.com>
To:     alex.shi@...ux.alibaba.com
Cc:     Shuah Khan <shuah@...nel.org>, Roman Gushchin <guro@...com>,
        Tejun Heo <tj@...nel.org>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Jay Kamat <jgkamat@...com>, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org, Claudio Zumbo <claudioz@...com>,
        Claudio <claudiozumbo@...il.com>
Subject: [PATCH 3/3] kselftest/cgroup: fix incorrect test_core skip

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, then the testing is meaningful.

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

Signed-off-by: Alex Shi <alex.shi@...ux.alibaba.com>
Cc: Shuah Khan <shuah@...nel.org>
Cc: Tejun Heo <tj@...nel.org>
Cc: Roman Gushchin <guro@...com>
Cc: Claudio Zumbo <claudioz@...com>
Cc: Claudio <claudiozumbo@...il.com>
Cc: linux-kselftest@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
---
 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