linux-kernel - [PATCH v6 5/7] kselftests: cgroup: don't fail on cg_kill_all() error in cg

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Date:   Fri, 21 Dec 2018 16:03:05 -0800
From:   Roman Gushchin <guroan@...il.com>
To:     Tejun Heo <tj@...nel.org>, Oleg Nesterov <oleg@...hat.com>
Cc:     kernel-team@...com, cgroups@...r.kernel.org,
        linux-kernel@...r.kernel.org, Roman Gushchin <guro@...com>,
        Shuah Khan <shuah@...nel.org>, linux-kselftest@...r.kernel.org
Subject: [PATCH v6 5/7] kselftests: cgroup: don't fail on cg_kill_all() error in cg_destroy()

If the cgroup destruction races with an exit() of a belonging
process(es), cg_kill_all() may fail. It's not a good reason to make
cg_destroy() fail and leave the cgroup in place, potentially causing
next test runs to fail.

Signed-off-by: Roman Gushchin <guro@...com>
Cc: Shuah Khan <shuah@...nel.org>
Cc: Tejun Heo <tj@...nel.org>
Cc: kernel-team@...com
Cc: linux-kselftest@...r.kernel.org
---
 tools/testing/selftests/cgroup/cgroup_util.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/tools/testing/selftests/cgroup/cgroup_util.c b/tools/testing/selftests/cgroup/cgroup_util.c
index 14c9fe284806..eba06f94433b 100644
--- a/tools/testing/selftests/cgroup/cgroup_util.c
+++ b/tools/testing/selftests/cgroup/cgroup_util.c
@@ -227,9 +227,7 @@ int cg_destroy(const char *cgroup)
 retry:
 	ret = rmdir(cgroup);
 	if (ret && errno == EBUSY) {
-		ret = cg_killall(cgroup);
-		if (ret)
-			return ret;
+		cg_killall(cgroup);
 		usleep(100);
 		goto retry;
 	}
-- 
2.19.2