深入理解RCU实现

                                e->rule.action = newaction;

                                e->rule.file_count = newfield_count;

                                write_unlock(&auditsc_lock);

                                return 0;

                        }

                }

                write_unlock(&auditsc_lock);

                return -EFAULT;         /* No matching rule */

        }

如果使用RCU，修改代码应当为；

      static inline int audit_upd_rule(struct audit_rule *rule,

                                         struct list_head *list,

                                         __u32 newaction,

                                         __u32 newfield_count)

        {

                struct audit_entry  *e;

                struct audit_newentry *ne;

                list_for_each_entry(e, list, list) {

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

                                ne = kmalloc(sizeof(*entry), GFP_ATOMIC);

                                if (ne == NULL)

                                        return -ENOMEM;

                                audit_copy_rule(&ne->rule, &e->rule);

                                ne->rule.action = newaction;

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