linux-kernel - Re: linux-next: build failure after merge of the bluetooth tree

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Date:   Fri, 23 Jun 2023 11:23:57 +0200
From:   Alexander Mikhalitsyn <alexander@...alicyn.com>
To:     "Von Dentz, Luiz" <luiz.von.dentz@...el.com>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Christian Brauner <brauner@...nel.org>,
        Jakub Kicinski <kuba@...nel.org>
Subject: Re: linux-next: build failure after merge of the bluetooth tree

On Fri, Jun 23, 2023 at 10:34 AM Alexander Mikhalitsyn
<alexander@...alicyn.com> wrote:
>
> On Fri, Jun 23, 2023 at 12:28 AM Von Dentz, Luiz
> <luiz.von.dentz@...el.com> wrote:
> >
> > Hi Stephen, Alexander,
>
> Dear friends,
>
> >
> > Looks like we have a similar problem as to:
> >
> > https://lore.kernel.org/lkml/20230524081933.44dc8bea@kernel.org/
> >
> > That said for unix socket it was decided to not allow it to be build as module, which is something I don't think we are willing to do for bluetooth, so we have to find a way to get around pidfd_prepare, which seems to be called due to the use of scm_recv (it is also used by netlink btw).
>
> Ugh, yep. That's bad and we can't workaround it like we did for unix sockets.
>
> Originally, Christian had objections against exporting the
> pidfd_prepare function [1]
>
> [1] https://lore.kernel.org/all/20230523-flechten-ortsschild-e5724ecc4ed0@brauner/
>
> +cc Christian

Idea. (-: We can introduce a new function like "scm_recv_light" that
will be just an old version of "scm_recv" without using pidfd,
if this feature with SCM_PIDFD is not important for hci sockets.

Forgot to add Jakub to CC.
+cc Jakub

>
> Kind regards,
> Alex
>
> >
> >
> > ________________________________ From: Stephen Rothwell
> > Sent: Monday, June 12, 2023 8:02 PM
> > To: Marcel Holtmann; Johan Hedberg
> > Cc: Von Dentz, Luiz; Linux Kernel Mailing List; Linux Next Mailing List
> > Subject: linux-next: build failure after merge of the bluetooth tree
> >
> > Hi all,
> >
> > After merging the bluetooth tree, today's linux-next build (arm
> > multi_v7_defconfig) failed like this:
> >
> > ERROR: modpost: "pidfd_prepare" [net/bluetooth/bluetooth.ko] undefined!
> >
> > Caused by commit
> >
> >   817efd3cad74 ("Bluetooth: hci_sock: Forward credentials to monitor")
> >
> > I have reverted that commit for today.
> >
> > --
> > Cheers,
> > Stephen Rothwell