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

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Date:   Fri, 23 Jun 2023 14:24:37 +0200
From:   Christian Brauner <brauner@...nel.org>
To:     Alexander Mikhalitsyn <alexander@...alicyn.com>
Cc:     "Von Dentz, Luiz" <luiz.von.dentz@...el.com>,
        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>,
        Jakub Kicinski <kuba@...nel.org>
Subject: Re: linux-next: build failure after merge of the bluetooth tree

On Fri, Jun 23, 2023 at 11:23:57AM +0200, Alexander Mikhalitsyn wrote:
> 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

Seems fine to me.