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    SubjectRe: [PATCH v14 05/12] cpuset: Add an error state to cpuset.sched.partition
    On Mon, Oct 15, 2018 at 04:29:30PM -0400, Waiman Long wrote:
    > Handling error returned by update_parent_subparts_cpumask() in
    > update_cpumasks_hier() is problematic as the states may become
    > inconsistent. To avoid that and increase flexibility in handling other
    > error cases, a new error state (-1) is added to the partition_root_state
    > flag. This new error state is set internally and user cannot write this
    > value to "cpuset.sched.partition".
    >
    > In this error state, the partition root becomes an erroneous one. It is
    > no longer a real partition root, but the CS_CPU_EXCLUSIVE flag will
    > still be set as it can be changed back to a real one if appropriate
    > change happens later on.

    I feel this Changelog should be much more explicit about the reasons
    this -1 state can happen. As is, I've got no clue.

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