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Message-ID: <CAHk-=whBBWGaQy=rtS2Ma6QPqbQ+jEUKUWfF2zS7gDXpim11bA@mail.gmail.com>
Date: Mon, 18 Dec 2023 17:17:05 -0800
From: Linus Torvalds <torvalds@...uxfoundation.org>
To: Jakub Kicinski <kuba@...nel.org>
Cc: Alexei Starovoitov <alexei.starovoitov@...il.com>, davem@...emloft.net, edumazet@...gle.com, 
	pabeni@...hat.com, daniel@...earbox.net, andrii@...nel.org, 
	peterz@...radead.org, brauner@...nel.org, netdev@...r.kernel.org, 
	bpf@...r.kernel.org, kernel-team@...com, linux-kernel@...r.kernel.org
Subject: Re: pull-request: bpf-next 2023-12-18

On Mon, 18 Dec 2023 at 16:55, Jakub Kicinski <kuba@...nel.org> wrote:
>
> LGTM, but what do I know about file systems.. Adding LKML to the CC
> list, if anyone has any late comments on the BPF token come forward
> now, petty please?

See my crossed email reply.

The file descriptor handling is FUNDAMENTALLY wrong. The first time
that happened, we chalked it up to a mistake. Now it's something
worse.

Please don't pull until at least that part is fixed.

I tried to review the token patches, but honestly, I got to that part
and I just gave up.

We had this whole discussion more than 6 months ago:

  https://lore.kernel.org/all/20230517-allabendlich-umgekehrt-8cc81f8313ac@brauner/

and I really thought the bpf people had *understood* they their
special use of "fd == 0" was wrong.

But it seems that they never did. Once is a mistake. Twice is a
choice. And the bpf people have chosen insanity.

               Linus

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