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    Subject[PATCH -next 00/22] remove in-kernel syscall invocations (part 2 == netdev)
    Date
    Here is another series of patches which reduce the number of syscall
    invocations from within the kernel. This series is focused solely on
    the net/ part of the kernel and get rids of syscall and compat_syscall
    invocations from within the kernel completely. It is also available at

    https://git.kernel.org/pub/scm/linux/kernel/git/brodo/linux.git syscalls-net-next

    The rationale of this change is described in patch 1 of part 1[*] as follows:

    The syscall entry points to the kernel defined by SYSCALL_DEFINEx()
    and COMPAT_SYSCALL_DEFINEx() should only be called from userspace
    through kernel entry points, but not from the kernel itself. This
    will allow cleanups and optimizations to the entry paths *and* to
    the parts of the kernel code which currently need to pretend to be
    userspace in order to make use of syscalls.

    At present, these patches are based on v4.16-rc5; there is one trivial
    conflict against net-next. Dave, I presume that you prefer to take them
    through net-next? If you want to, I can re-base them against net-next.
    If you prefer otherwise, though, I can route them as part of my whole
    syscall series.

    Thanks,
    Dominik

    [*] The cover letter for v2 is available at
    http://lkml.kernel.org/r/20180315190529.20943-1-linux@dominikbrodowski.net ;
    the whole patchset -- in its current, slightly modified form -- is available at
    at https://git.kernel.org/pub/scm/linux/kernel/git/brodo/linux.git syscalls-next

    Dominik Brodowski (22):
    net: socket: add __sys_recvfrom() helper; remove in-kernel call to
    syscall
    net: socket: add __sys_sendto() helper; remove in-kernel call to
    syscall
    net: socket: add __sys_accept4() helper; remove in-kernel call to
    syscall
    net: socket: add __sys_socket() helper; remove in-kernel call to
    syscall
    net: socket: add __sys_bind() helper; remove in-kernel call to syscall
    net: socket: add __sys_connect() helper; remove in-kernel call to
    syscall
    net: socket: add __sys_listen() helper; remove in-kernel call to
    syscall
    net: socket: add __sys_getsockname() helper; remove in-kernel call to
    syscall
    net: socket: add __sys_getpeername() helper; remove in-kernel call to
    syscall
    net: socket: add __sys_socketpair() helper; remove in-kernel call to
    syscall
    net: socket: add __sys_shutdown() helper; remove in-kernel call to
    syscall
    net: socket: add __sys_setsockopt() helper; remove in-kernel call to
    syscall
    net: socket: add __sys_getsockopt() helper; remove in-kernel call to
    syscall
    net: socket: add do_sys_recvmmsg() helper; remove in-kernel call to
    syscall
    net: socket: move check for forbid_cmsg_compat to __sys_...msg()
    net: socket: replace calls to sys_send() with __sys_sendto()
    net: socket: replace call to sys_recv() with __sys_recvfrom()
    net: socket: add __compat_sys_recvfrom() helper; remove in-kernel call
    to compat syscall
    net: socket: add __compat_sys_setsockopt() helper; remove in-kernel
    call to compat syscall
    net: socket: add __compat_sys_getsockopt() helper; remove in-kernel
    call to compat syscall
    net: socket: add __compat_sys_recvmmsg() helper; remove in-kernel call
    to compat syscall
    net: socket: add __compat_sys_...msg() helpers; remove in-kernel calls
    to compat syscalls

    include/linux/socket.h | 37 +++++++-
    net/compat.c | 136 +++++++++++++++++++---------
    net/socket.c | 234 ++++++++++++++++++++++++++++++++++---------------
    3 files changed, 291 insertions(+), 116 deletions(-)

    --
    2.16.2

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