ubuntu-trusty master-next currently FTBFS on arm64

[Luis Henriques]

On Wed, Aug 06, 2014 at 06:37:41AM -0600, Dann Frazier wrote:
> Thanks Joseph. I've verified that this is *not* an issue in the
> upstream branch. This appears to be a bad interaction between this fix
> and the aufs patches in Ubuntu.
>
> Smallest fix appears to be as follows, though 8646cbac from utopic
> looks like it might be a proper (though more involved) solution.
> 

Yeah, this seems to be correct: commit c9c5b652e3d8 ("UBUNTU: ubuntu:
aufs3 -- (no-up) aufs3-mmap.patch") introduced some changes into
linux/mm.h that don't play nicely with the commit c3208d7fd18a
("ptrace: fix fork event messages across pid namespaces").

Your patch seems to be an acceptable SAUCE patch to fix this build
failure.

Cheers,
--
Luís

> diff --git a/include/linux/ptrace.h b/include/linux/ptrace.h
> index cc79eff..8314249 100644
> --- a/include/linux/ptrace.h
> +++ b/include/linux/ptrace.h
> @@ -5,9 +5,10 @@
>  #include <linux/sched.h>        /* For struct task_struct.  */
>  #include <linux/err.h>            /* for IS_ERR_VALUE */
>  #include <linux/bug.h>            /* For BUG_ON.  */
> -#include <linux/pid_namespace.h>    /* For task_active_pid_ns.  */
>  #include <uapi/linux/ptrace.h>
> 
> +extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk);
> +
>  /*
>   * Ptrace flags
>   *
> 
> -- 
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