Re: [PATCH 07/17] net: convert sock.sk_refcnt from atomic_t to refcount_t

[Eric Dumazet]

On Mon, 2017-03-20 at 07:51 -0700, Eric Dumazet wrote:

> atomic_cmpxchg() on PowerPC is horribly more expensive because of the
> added two SYNC instructions.

Although I just saw that refcount was using atomic_cmpxchg_relaxed()

Time to find some documentation (probably missing) or get some specs for
this thing.