Re: [Lse-tech] [RFC,PATCH] use rcu for fasync_lock

[Manfred Spraul <manfred@colorfullife.com>]

Stephen Hemminger wrote:

>>
>> +struct fasync_rcu_struct {
>> +    struct fasync_struct data;
>> +    struct rcu_head rcu;
>> +};
>>  
>>
> Why do needless wrapping of existing structure? Just add and rcu 
> element to it!
>
There are two independant users of fasync_struct
- networking does it's own locking and allocation and uses __kill_fasync 
directly.
- everyone else uses fasync_helper and calls kill_fasync, with the 
locking logic in fcntl.c.

I didn't convert the network code, thus I couldn't add the rcu member 
into fasync_struct.

--
    Manfred