Quoting Alexey Dobriyan ([email protected]):
> copy_pid_ns() is a perfect example of a case where unwinding leads to more
> code and makes it less clear. Watch the diffstat.
> 
> Signed-off-by: Alexey Dobriyan <[email protected]>

Nice.

Reviewed-by: Serge Hallyn <[email protected]>

thanks,
-serge

> ---
>  kernel/pid_namespace.c |   18 +++---------------
>  1 files changed, 3 insertions(+), 15 deletions(-)
> 
> diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c
> index 495d5de..821722a 100644
> --- a/kernel/pid_namespace.c
> +++ b/kernel/pid_namespace.c
> @@ -116,23 +116,11 @@ static void destroy_pid_namespace(struct pid_namespace 
> *ns)
> 
>  struct pid_namespace *copy_pid_ns(unsigned long flags, struct pid_namespace 
> *old_ns)
>  {
> -     struct pid_namespace *new_ns;
> -
> -     BUG_ON(!old_ns);
> -     new_ns = get_pid_ns(old_ns);
>       if (!(flags & CLONE_NEWPID))
> -             goto out;
> -
> -     new_ns = ERR_PTR(-EINVAL);
> +             return get_pid_ns(old_ns);
>       if (flags & CLONE_THREAD)
> -             goto out_put;
> -
> -     new_ns = create_pid_namespace(old_ns);
> -
> -out_put:
> -     put_pid_ns(old_ns);
> -out:
> -     return new_ns;
> +             return ERR_PTR(-EINVAL);
> +     return create_pid_namespace(old_ns);
>  }
> 
>  void free_pid_ns(struct kref *kref)
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