On Thu, Dec 1, 2016 at 9:42 PM, Cong Wang <xiyou.wangc...@gmail.com> wrote:
> On Thu, Dec 1, 2016 at 5:12 PM, Alexey Dobriyan <adobri...@gmail.com> wrote:
>> struct net_generic {
>> - unsigned int len;
>> - struct rcu_head rcu;
>> + struct {
>> + unsigned int len;
>> + struct rcu_head rcu;
>> + } s;
>>
>> void *ptr[0];
>> };
>
> I think you can put them in a union, since rcu is only used
> for kfree_rcu() where len is not needed and rcu_head doesn't
> need to be initialized by callers.
Never mind, readers could be still reading ->len while we modify
->rcu. So they can't be in a union.
