[git pull] reducing kernel_recvmsg() use

[Al Viro]

	kernel_recvmsg() is a set_fs()-using wrapper for
sock_recvmsg().  In all but one case that is not needed -
use of ITER_KVEC for ->msg_iter takes care of the data
and does not care about set_fs().  The only exception is
svc_udp_recvfrom() where we want cmsg to be store into
kernel object; everything else can just use sock_recvmsg()
and be done with that.

	A followup converting svc_udp_recvfrom() away
from set_fs() (and killing kernel_recvmsg() off) is *NOT*
in that one - I'd like to hear what netdev folks think
of the approach proposed in that followup.

The following changes since commit 4fbd8d194f06c8a3fd2af1ce560ddb31f7ec8323:

  Linux 4.15-rc1 (2017-11-26 16:01:47 -0800)

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git work.sock_recvmsg

for you to fetch changes up to bc4802736d8b17eddde52e00838c348770f67c19:

  tipc: switch to sock_recvmsg() (2017-12-02 20:38:10 -0500)

----------------------------------------------------------------
Al Viro (10):
      svc_recvfrom(): switch to sock_recvmsg()
      dlm: switch to sock_recvmsg()
      ncpfs: switch to sock_recvmsg()
      cfs2: switch to sock_recvmsg()
      lustre lnet_sock_read(): switch to sock_recvmsg()
      drbd: switch to sock_recvmsg()
      mISDN: switch to sock_recvmsg()
      ipvs: switch to sock_recvmsg()
      smc: switch to sock_recvmsg()
      tipc: switch to sock_recvmsg()

 drivers/block/drbd/drbd_main.c                |  8 +-------
 drivers/block/drbd/drbd_receiver.c            |  3 ++-
 drivers/isdn/mISDN/l1oip_core.c               | 22 +++++++++-------------
 drivers/staging/lustre/lnet/lnet/lib-socket.c | 24 +++++++++++-------------
 fs/dlm/lowcomms.c                             |  4 ++--
 fs/ncpfs/sock.c                               |  3 ++-
 fs/ocfs2/cluster/tcp.c                        |  3 ++-
 net/netfilter/ipvs/ip_vs_sync.c               |  9 +++------
 net/smc/smc_clc.c                             | 18 ++++++++++--------
 net/sunrpc/svcsock.c                          |  4 ++--
 net/tipc/server.c                             |  4 ++--
 11 files changed, 46 insertions(+), 56 deletions(-)