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    SubjectRe: [patch V2 08/10] timer: Implement the hierarchical pull model
    On Tue, Apr 18, 2017 at 01:11:10PM +0200, Thomas Gleixner wrote:
    > +struct tmigr_group {
    > + raw_spinlock_t lock;
    > + unsigned int active;
    > + unsigned int migrator;
    > + struct timerqueue_head events;
    > + struct tmigr_event groupevt;
    > + struct tmigr_group *parent;
    > + cpumask_var_t cpus;
    > + struct list_head list;
    > + unsigned int level;
    > + unsigned int numa_node;
    > + unsigned int num_childs;
    > +};

    If you place the cpumask at the end, as a 0 sized array, you can avoid a
    second allocation.

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