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From:   Arnd Bergmann <arnd@arndb.de>
Date:   Fri, 26 Jul 2019 11:57:28 +0200
Message-ID: <CAK8P3a3VK77OvRPY-nozEGbcfHks6YdcyE7cY_2UEN9nfy=hRg@mail.gmail.com>
Subject: Re: [PATCH 2/5] pidfd: add pidfd_wait()
To:     Christian Brauner <christian@brauner.io>
Cc:     Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Oleg Nesterov <oleg@redhat.com>,
        "Eric W . Biederman" <ebiederm@xmission.com>,
        Kees Cook <keescook@chromium.org>,
        Joel Fernandes <joel@joelfernandes.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Tejun Heo <tj@kernel.org>, David Howells <dhowells@redhat.com>,
        Jann Horn <jannh@google.com>,
        Andy Lutomirski <luto@kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Aleksa Sarai <cyphar@cyphar.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Al Viro <viro@zeniv.linux.org.uk>,
        Android Kernel Team <kernel-team@android.com>,
        Linux API <linux-api@vger.kernel.org>
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On Fri, Jul 26, 2019 at 10:24 AM Christian Brauner <christian@brauner.io> wrote:
>
> > It would be nice to introduce it in a separate patch, and then use it
> > to kill off
> > compat_sys_getrusage() and compat_sys_wait4(), and possibly even
> > compat_sys_waitid() in combination with your copy_siginfo_to_user_any().
> > That could be done as a cleanup patch afterwards, or as part of your series.
>
> Right, but we won't go the syscall route but instead go the P_PIDFD
> route for waitid(). :)

Ah, of course, nevermind then. It would still be a useful cleanup, but
many other things would be as well.

      Arnd