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list_head    dev_list;    /* list of all mpath_devs */ >> +    struct mutex        lock; >> + >> +    struct kref        ref; >> + >> +    struct mpath_device __rcu         *current_path[MAX_NUMNODES]; >> +    void            *drvdata; >> +}; > > Can we use current_path[] as last element and flex array (same as what > we have today under struct nvme_ns_head) so that we don't need to > allocate array as big as MAX_NUMANODES? With flex array we can use > num_possible_nodes() which may be much smaller than MAX_NUMANODES. Sure, I don't see a problem with that. I think that using MAX_NUMNODES was a leftover from an earlier dev approach. Thanks!