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    Subject[PATCH v2 06/36] fs: add do_pipe2() helper; remove internal call to sys_pipe2()
    Date
    Using this helper removes an in-kernel call to the sys_pipe2() syscall.

    Cc: Alexander Viro <viro@zeniv.linux.org.uk>
    Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
    ---
    fs/pipe.c | 9 +++++++--
    1 file changed, 7 insertions(+), 2 deletions(-)

    diff --git a/fs/pipe.c b/fs/pipe.c
    index 7b1954caf388..39d6f431da83 100644
    --- a/fs/pipe.c
    +++ b/fs/pipe.c
    @@ -841,7 +841,7 @@ int do_pipe_flags(int *fd, int flags)
    * sys_pipe() is the normal C calling standard for creating
    * a pipe. It's not the way Unix traditionally does this, though.
    */
    -SYSCALL_DEFINE2(pipe2, int __user *, fildes, int, flags)
    +static int do_pipe2(int __user *fildes, int flags)
    {
    struct file *files[2];
    int fd[2];
    @@ -863,9 +863,14 @@ SYSCALL_DEFINE2(pipe2, int __user *, fildes, int, flags)
    return error;
    }

    +SYSCALL_DEFINE2(pipe2, int __user *, fildes, int, flags)
    +{
    + return do_pipe2(fildes, flags);
    +}
    +
    SYSCALL_DEFINE1(pipe, int __user *, fildes)
    {
    - return sys_pipe2(fildes, 0);
    + return do_pipe2(fildes, 0);
    }

    static int wait_for_partner(struct pipe_inode_info *pipe, unsigned int *cnt)
    --
    2.16.2
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