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.
