Re: [PATCH v4 net-next 0/2] tcp: mmap: rework zerocopy receive

[David Miller]

From: Eric Dumazet <edumazet@xxxxxxxxxx>
Date: Fri, 27 Apr 2018 08:58:07 -0700

> syzbot reported a lockdep issue caused by tcp mmap() support.
> 
> I implemented Andy Lutomirski nice suggestions to resolve the
> issue and increase scalability as well.
> 
> First patch is adding a new getsockopt() operation and changes mmap()
> behavior.
> 
> Second patch changes tcp_mmap reference program.
> 
> v4: tcp mmap() support depends on CONFIG_MMU, as kbuild bot told us.
> 
> v3: change TCP_ZEROCOPY_RECEIVE to be a getsockopt() option
>     instead of setsockopt(), feedback from Ka-Cheon Poon
> 
> v2: Added a missing page align of zc->length in tcp_zerocopy_receive()
>     Properly clear zc->recv_skip_hint in case user request was completed.

Looks great, series applied, thanks Eric.