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    SubjectRe: [PATCH 1/7] containers (V7): Generic container system abstracted from cpusets code
    On 2/12/07, Paul Menage <menage@google.com> wrote:
    > reaches zero. RCU is still fine for reading the container_group
    > pointers, but it's no good for updating them, since by the time you
    > update it it may no longer be your container_group structure, and may
    > instead be about to be deleted as soon as the other thread's
    > rcu_synchronize() completes.

    On further reflection, this probably would be safe after all. Since we
    don't call put_container_group() in attach_task() until after
    synchronize_rcu() completes, that implies that a container_group_get()
    from the RCU section would have already completed. So we should be
    fine.

    Paul
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