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    Subject[PATCHSET] fix CGROUP VS RCU

    current some cgroup struct are protected by RCU.

    struct protected by RCU:
    struct css_set, struct cgroup_subsys_state, struct cgroup

    pointer protected by RCU:
    struct task_struct.cgroups, struct css_set.subsys[*],
    struct cgroup_subsys_state.cgroup
    the last two pointers are readonly pointer!

    these patches are fix these structs, and pointers. And a faker:
    struct cgroup_subsys.root

    Not cleanup all yet.

    Thanx, Lai



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