linux-kernel - [PATCH 4/5] kselftests: cgroup: don't fail on cg_kill_all() error in cg

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Message-Id: <20181108201600.9129-5-guro@fb.com>
Date:   Thu,  8 Nov 2018 15:15:59 -0500
From:   Roman Gushchin <guroan@...il.com>
To:     cgroups@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, kernel-team@...com,
        Roman Gushchin <guro@...com>, Shuah Khan <shuah@...nel.org>,
        Tejun Heo <tj@...nel.org>
Subject: [PATCH 4/5] 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
---
 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;
 	}
-- 
2.17.2