selftests/cgroup: Fix incorrect variable check in online_cpus()

"OFFLINE_CPUS" is a literal string that is always non-empty. It should
be "$OFFLINE_CPUS" to check the variable's value instead.

Signed-off-by: Hongfu Li <lihongfu@kylinos.cn>
Signed-off-by: Tejun Heo <tj@kernel.org>

diff --git a/tools/testing/selftests/cgroup/test_cpuset_prs.sh b/tools/testing/selftests/cgroup/test_cpuset_prs.sh
index a56f4153c64df86b51389b6f724fa668335cf962..df89ddfa073ff41aea671532eb2cd80c4403fb08 100755 (executable)
--- a/tools/testing/selftests/cgroup/test_cpuset_prs.sh
+++ b/tools/testing/selftests/cgroup/test_cpuset_prs.sh
@@ -617,7 +617,7 @@ set_ctrl_state_noerr()
 
 online_cpus()
 {
-       [[ -n "OFFLINE_CPUS" ]] && {
+       [[ -n "$OFFLINE_CPUS" ]] && {
                for C in $OFFLINE_CPUS
                do
                        write_cpu_online ${C}=1