linux-kernel - Re: [PATCH v1 2/4] pid: add pidctl()

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Date:   Tue, 26 Mar 2019 13:18:53 -0400
From:   Joel Fernandes <joel@...lfernandes.org>
To:     Christian Brauner <christian@...uner.io>
Cc:     Jann Horn <jannh@...gle.com>,
        Konstantin Khlebnikov <khlebnikov@...dex-team.ru>,
        Andy Lutomirski <luto@...nel.org>,
        David Howells <dhowells@...hat.com>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Linux API <linux-api@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Kees Cook <keescook@...omium.org>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Thomas Glexiner <tglx@...utronix.de>,
        Michael Kerrisk-manpages <mtk.manpages@...il.com>,
        Jonathan Kowalski <bl0pbl33p@...il.com>,
        "Dmitry V. Levin" <ldv@...linux.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Oleg Nesterov <oleg@...hat.com>,
        Nagarathnam Muthusamy <nagarathnam.muthusamy@...cle.com>,
        Aleksa Sarai <cyphar@...har.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Daniel Colascione <dancol@...gle.com>
Subject: Re: [PATCH v1 2/4] pid: add pidctl()

On Tue, Mar 26, 2019 at 1:17 PM Christian Brauner <christian@...uner.io> wrote:
>
> On Tue, Mar 26, 2019 at 01:15:25PM -0400, Joel Fernandes wrote:
> > On Tue, Mar 26, 2019 at 06:08:28PM +0100, Christian Brauner wrote:
> > [snip]
> > > >
> > > > > +
> > > > > +               if (!result)
> > > > > +                       result = -ENOENT;
> > > > > +
> > > > > +               put_pid(struct_pid);
> > > >
> > > > so on error you would put_pid twice which seems odd..  I would suggest, don't
> > > > release the pid ref from within pidfd_create_fd, release the ref from the
> > > > caller. Speaking of which, I added to my list to convert the pid->count to
> > > > refcount_t at some point :)
> > >
> > > as i said, pidfd_create_fd takes its own reference
> >
> > Oh. That was easy to miss. Fair enough. I take that comment back.
> >
> > Please also reply to the other comments I posted, thanks. Generally on LKML,
> > I have seen there is an expectation to reply to all reviewer's review
> > comments even if you agree with them. This helps keep the review going
> > smoothly. Just my 2 cents.
>
> I tend to do it in multiple mails depending on whether or not I need to
> think about a comment or not.

Ok, that's also fine with me. thanks,

 - Joel