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Date:      Thu, 19 Oct 2023 17:09:12 +0200
From:      Kristof Provost <kp@FreeBSD.org>
To:        Jessica Clarke <jrtc27@freebsd.org>
Cc:        src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org
Subject:   Re: git: 9eff6390718d - main - pf: remove COMPAT_FREEBSD14 #ifdef from pfvar.h
Message-ID:  <F341F8D8-FDEC-4C07-8170-1233B0211FA9@FreeBSD.org>
In-Reply-To: <1EB17D31-16CB-44D2-A19E-6CC9699156D1@freebsd.org>
References:  <202310191420.39JEKitw071108@gitrepo.freebsd.org> <1DDF7B7C-9137-48F4-80C9-FDCC82F47118@freebsd.org> <AC90FDA2-1F8B-4984-9BCC-140D041BD729@FreeBSD.org> <1EB17D31-16CB-44D2-A19E-6CC9699156D1@freebsd.org>

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On 19 Oct 2023, at 17:02, Jessica Clarke wrote:
> On 19 Oct 2023, at 15:56, Kristof Provost <kp@FreeBSD.org> wrote:
>>
>> On 19 Oct 2023, at 16:41, Jessica Clarke wrote:
>>> On 19 Oct 2023, at 15:20, Kristof Provost <kp@FreeBSD.org> wrote:
>>>>
>>>> The branch main has been updated by kp:
>>>>
>>>> URL: https://cgit.FreeBSD.org/src/commit/?id=3D9eff6390718d0fa67dffc=
6cd830b0bc6b815e8c4
>>>>
>>>> commit 9eff6390718d0fa67dffc6cd830b0bc6b815e8c4
>>>> Author:     Kristof Provost <kp@FreeBSD.org>
>>>> AuthorDate: 2023-10-19 10:06:29 +0000
>>>> Commit:     Kristof Provost <kp@FreeBSD.org>
>>>> CommitDate: 2023-10-19 14:19:39 +0000
>>>>
>>>>   pf: remove COMPAT_FREEBSD14 #ifdef from pfvar.h
>>>>
>>>>   When userspace includes pfvar.h it doesn't get the kernel's COMPAT=
_*
>>>>   defines, so we end up not having required symbols in userspace. Th=
is
>>>>   caused the libpfctl port to fail to build.
>>>>
>>>>   libpfctl will be updated to use the new netlink-based state export=
 code
>>>>   soon, which will also fix thix build issue.
>>>>
>>>>   Sponsored by:   Rubicon Communications, LLC ("Netgate")
>>>
>>> That=E2=80=99s normally a feature to stop userspace using deprecated =
things.
>>> Will you be reverting this once libpfctl is fixed? One could also hac=
k
>>> libpfctl instead to define COMPAT_FREEBSD14 temporarily (IIRC that=E2=
=80=99s
>>> what was done for kbdcontrol to allow it to run on old kernels).
>>>
>> I wasn=E2=80=99t planning on that, no. The libpfctl port fix should la=
nd soon, but I figured that it=E2=80=99d be better to keep the definition=
s, because userspace doesn=E2=80=99t know if the kernel is built with or =
without COMPAT_FREEBSD14.
>> I=E2=80=99m open to being persuaded that that=E2=80=99s a bad idea tho=
ugh.
>
> Indeed it doesn=E2=80=99t, because it shouldn=E2=80=99t. The thinking i=
s that userspace
> should *never* explicitly use them, only the kernel to provide
> compatibility with binaries built against older versions. Deliberately
> exposing them to userspace is quite unusual and deemed generally dodgy.=

>
That makes sense. I=E2=80=99ll revert this change once the libpfctl port =
update has had a chance to land and get built.

Best regards,
Kristof



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