linux-kernel - Re: [PATCH 3/6] bpf: task_group_seq_get_next: fix the skip_if_dup

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Date:   Thu, 31 Aug 2023 01:54:59 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     Yonghong Song <yonghong.song@...ux.dev>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Yonghong Song <yhs@...com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Kui-Feng Lee <kuifeng@...com>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...nel.org>,
        bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/6] bpf: task_group_seq_get_next: fix the
 skip_if_dup_files check

On 08/28, Yonghong Song wrote:
>
> On 8/28/23 3:54 AM, Oleg Nesterov wrote:
> >
> >Could you review 6/6 as well?
>
> I think we can wait patch 6/6 after
>    https://lore.kernel.org/all/20230824143142.GA31222@redhat.com/
> is merged.

OK.

> >Should I fold 1-5 into a single patch? I tried to document every change
> >and simplify the review, but I do not want to blow the git history.
>
> Currently, because patch 6, the whole patch set cannot be tested by
> bpf CI since it has a build failure:
>   https://github.com/kernel-patches/bpf/pull/5580

Heh. I thought this is obvious. I thought you can test 1-5 without 6/6
and _review_ 6/6.

I simply can't understand how can this pull/5580 come when I specially
mentioned

	> 6/6 obviously depends on
	>
	>	[PATCH 1/2] introduce __next_thread(), fix next_tid() vs exec() race
	>	https://lore.kernel.org/all/20230824143142.GA31222@redhat.com/
	>
	> which was not merged yet.

in 0/6.

> I suggest you get patch 1-5 and resubmit with tag like
>   "bpf-next v2"
>   [Patch bpf-next v2 x/5] ...
> so CI can build with different architectures and compilers to
> ensure everything builds and runs fine.

I think we can wait for

	https://lore.kernel.org/all/20230824143142.GA31222@redhat.com/

as you suggest above, then I'll send the s/next_thread/__next_thread/
oneliner without 1-5. I no longer think it makes sense to try to cleanup
the poor task_group_seq_get_next() when IMHO the whole task_iter logic
needs the complete rewrite. Yes, yes, I know, it is very easy to blame
someone else's code, sorry can't resist ;)

The only "fix" in this series is 3/6, but this code has more serious
bugs, so I guess we can forget it.

Oleg.