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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Alex Shi <alex.shi@linux.alibaba.com>,
        Shuah Khan <shuah@kernel.org>, Tejun Heo <tj@kernel.org>,
        Roman Gushchin <guro@fb.com>, Claudio Zumbo <claudioz@fb.com>,
        Claudio <claudiozumbo@gmail.com>,
        linux-kselftest@vger.kernel.org,
        Shuah Khan <skhan@linuxfoundation.org>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.19 47/90] kselftest/cgroup: fix incorrect test_core skip
Date:   Mon, 24 Jun 2019 17:56:37 +0800
Message-Id: <20190624092317.331693028@linuxfoundation.org>
In-Reply-To: <20190624092313.788773607@linuxfoundation.org>
References: <20190624092313.788773607@linuxfoundation.org>
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[ Upstream commit f97f3f8839eb9de5843066d80819884f7722c8c5 ]

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.shi@linux.alibaba.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Roman Gushchin <guro@fb.com>
Cc: Claudio Zumbo <claudioz@fb.com>
Cc: Claudio <claudiozumbo@gmail.com>
Cc: linux-kselftest@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Reviewed-by: Roman Gushchin <guro@fb.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@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 d78f1c5366d3..79053a4f4783 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;
 	}
-- 
2.20.1