深入理解RCU实现

                                list_del(&e->list);

                                write_unlock(&auditsc_lock);

                                return 0;

                        }

                }

                write_unlock(&auditsc_lock);

                return -EFAULT;         /* No matching rule */

        }

        static inline int audit_add_rule(struct audit_entry *entry,

                                         struct list_head *list)

        {

                write_lock(&auditsc_lock);

                if (entry->rule.flags & AUDIT_PREPEND) {

                        entry->rule.flags &= ~AUDIT_PREPEND;

                        list_add(&entry->list, list);

                } else {

                        list_add_tail(&entry->list, list);

                }

                write_unlock(&auditsc_lock);

                return 0;

        }

使用RCU后写端代码变成为：

       static inline int audit_del_rule(struct audit_rule *rule,

                                         struct list_head *list)

        {

                struct audit_entry  *e;

                /* Do not use the _rcu iterator here, since this is the only

                 * deletion routine. */

                list_for_each_entry(e, list, list) {

                        if (!audit_compare_rule(rule, &e->rule)) {

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