(2012/10/31 13:22), Tejun Heo wrote:
> 2ef37d3fe4 ("memcg: Simplify mem_cgroup_force_empty_list error
> handling") removed the last user of __DEPRECATED_clear_css_refs. This
> patch removes __DEPRECATED_clear_css_refs and mechanisms to support
> it.
>
> * Conditionals dependent on __DEPRECATED_clear_css_refs removed.
>
> * ->pre_destroy() now can only fail if a new task is attached or child
> cgroup is created while ->pre_destroy()s are being called. As the
> condition is checked again after re-acquiring cgroup_mutex
> afterwards, we don't need to take any immediate action on
> ->pre_destroy() failures. This reduces cgroup_call_pre_destroy() to
> a simple loop surrounding ->pre_destory(). Remove
> cgroup_call_pre_destroy() and open-code the loop into
> cgroup_rmdir().
>
> * cgroup_clear_css_refs() can no longer fail. All that needs to be
> done are deactivating refcnts, setting CSS_REMOVED and putting the
> base reference on each css. Remove cgroup_clear_css_refs() and the
> failure path, and open-code the loops into cgroup_rmdir().
>
> Note that cgroup_rmdir() will see more cleanup soon.
>
> Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
I thank you and Michal for this work.
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxx>
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