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The CS_ONLINE flag was introduced prior to the CSS_ONLINE flag in the cpuset subsystem. Currently, the flag setting sequence is as follows: 1. cpuset_css_online() sets CS_ONLINE 2. css->flags gets CSS_ONLINE set ... 3. cgroup->kill_css sets CSS_DYING 4. cpuset_css_offline() clears CS_ONLINE 5. css->flags clears CSS_ONLINE The is_cpuset_online() check currently occurs between steps 1 and 3. However, it would be equally safe to perform this check between steps 2 and 3, as CSS_ONLINE provides the same synchronization guarantee as CS_ONLINE. Since CS_ONLINE is redundant with CSS_ONLINE and provides no additional synchronization benefits, we can safely remove it to simplify the code. Signed-off-by: Chen Ridong <chenridong@huawei.com> Acked-by: Waiman Long <longman@redhat.com> Signed-off-by: Tejun Heo <tj@kernel.org>