linux_epoch_head
static struct linux_epoch_head linux_epoch_head[RCU_TYPE_MAX];
struct linux_epoch_head *head;
head = &linux_epoch_head[j];
struct linux_epoch_head *head = context;
linux_synchronize_rcu(head - linux_epoch_head);
struct linux_epoch_head *head;
head = &linux_epoch_head[type];
struct linux_epoch_head *head;
head = &linux_epoch_head[type];