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Date: Sun, 29 Apr 2018 21:34:17 -0400 (EDT) From: David Miller <davem@...emloft.net> To: edumazet@...gle.com Cc: netdev@...r.kernel.org, luto@...nel.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org, ka-cheong.poon@...cle.com, eric.dumazet@...il.com Subject: Re: [PATCH v4 net-next 0/2] tcp: mmap: rework zerocopy receive From: Eric Dumazet <edumazet@...gle.com> 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.
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