linux-kernel - Re: [PATCH v7 1/6] pidfd: add PIDFD_SELF* sentinels to refer to own thread/process

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Message-ID: <dfbeb51e-f6ce-4cdf-9b91-a7d4f5e995dc@lucifer.local>
Date: Tue, 11 Feb 2025 15:45:20 +0000
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: Michal Koutný <mkoutny@...e.com>
Cc: Christian Brauner <christian@...uner.io>, Shuah Khan <shuah@...nel.org>,
        "Liam R . Howlett" <Liam.Howlett@...cle.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Vlastimil Babka <vbabka@...e.cz>, pedro.falcato@...il.com,
        linux-kselftest@...r.kernel.org, linux-mm@...ck.org,
        linux-fsdevel@...r.kernel.org, linux-api@...r.kernel.org,
        linux-kernel@...r.kernel.org, Oliver Sang <oliver.sang@...el.com>,
        John Hubbard <jhubbard@...dia.com>, Tejun Heo <tj@...nel.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Shakeel Butt <shakeel.butt@...ux.dev>
Subject: Re: [PATCH v7 1/6] pidfd: add PIDFD_SELF* sentinels to refer to own
 thread/process

On Tue, Feb 11, 2025 at 04:24:07PM +0100, Michal Koutný wrote:
> On Thu, Jan 30, 2025 at 08:40:26PM +0000, Lorenzo Stoakes <lorenzo.stoakes@...cle.com> wrote:
> >
> > Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
> > ---
> >  include/uapi/linux/pidfd.h |  24 +++++++++
> >  kernel/pid.c               |  24 +++++++--
> >  kernel/signal.c            | 106 ++++++++++++++++++++++---------------
> >  3 files changed, 107 insertions(+), 47 deletions(-)
>
> Practical idea, thanks.

Thanks!

>
> > diff --git a/include/uapi/linux/pidfd.h b/include/uapi/linux/pidfd.h
> > + * To cut the Gideon knot, for internal kernel usage, we refer to
>
> A nit
> https://en.wikipedia.org/wiki/Gordian_Knot
>
> (if still applicable)

MY GOD. Hahaha. How embarrassing. God knows how 'Gideon' ended up
there. Apologies to all, I appear to have had a senior moment there...

Feel free to correct Christian, unless we want to leave this as an Easter
Egg?  :P

>
> Michal