cgroup: bounce cgroup_subsys_state ref kill confirmation to a work item
css (cgroup_subsys_state) offlining, which requires process context, will be moved to ref kill confirmation. In preparation, bounce css_killed handling through css->destroy_work. css_ref_killed_fn() is renamed to css_killed_ref_fn() so that it's consistent with the new css_killed_work_fn(). This patch adds an additional work item bouncing but doesn't change the actual logic. Signed-off-by: NTejun Heo <tj@kernel.org> Acked-by: NLi Zefan <lizefan@huawei.com>
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