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

From: David Miller
Date: Sun Apr 29 2018 - 21:34:39 EST

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.