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    Subject[PATCH 020/109] net: socket: add __sys_getsockopt() helper; remove in-kernel call to syscall
    Date
    Using the net-internal helper __sys_getsockopt() allows us to avoid the
    internal calls to the sys_getsockopt() syscall.

    This patch is part of a series which removes in-kernel calls to syscalls.
    On this basis, the syscall entry path can be streamlined. For details, see
    http://lkml.kernel.org/r/20180325162527.GA17492@light.dominikbrodowski.net

    Cc: David S. Miller <davem@davemloft.net>
    Cc: netdev@vger.kernel.org
    Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
    ---
    net/socket.c | 14 ++++++++++----
    1 file changed, 10 insertions(+), 4 deletions(-)

    diff --git a/net/socket.c b/net/socket.c
    index 5dd2e39a6cd4..a05289b1f863 100644
    --- a/net/socket.c
    +++ b/net/socket.c
    @@ -1918,8 +1918,8 @@ SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
    * to pass a user mode parameter for the protocols to sort out.
    */

    -SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
    - char __user *, optval, int __user *, optlen)
    +static int __sys_getsockopt(int fd, int level, int optname,
    + char __user *optval, int __user *optlen)
    {
    int err, fput_needed;
    struct socket *sock;
    @@ -1944,6 +1944,12 @@ SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
    return err;
    }

    +SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
    + char __user *, optval, int __user *, optlen)
    +{
    + return __sys_getsockopt(fd, level, optname, optval, optlen);
    +}
    +
    /*
    * Shutdown a socket.
    */
    @@ -2563,8 +2569,8 @@ SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
    break;
    case SYS_GETSOCKOPT:
    err =
    - sys_getsockopt(a0, a1, a[2], (char __user *)a[3],
    - (int __user *)a[4]);
    + __sys_getsockopt(a0, a1, a[2], (char __user *)a[3],
    + (int __user *)a[4]);
    break;
    case SYS_SENDMSG:
    err = sys_sendmsg(a0, (struct user_msghdr __user *)a1, a[2]);
    --
    2.16.3
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