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

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Message-ID: <20250217-endlich-etwas-ce9c8d815a6e@brauner>
Date: Mon, 17 Feb 2025 09:24:19 +0100
From: Christian Brauner <brauner@...nel.org>
To: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Cc: Michal Koutný <mkoutny@...e.com>, 
	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 03:45:20PM +0000, Lorenzo Stoakes wrote:
> 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

Everybody knows it's the "quotidian knot" that's the most challenging.