Re: [PATCH bpf-next v4 1/8] btf: Add a new kfunc set which allows to mark a function to be sleepable

[Yosry Ahmed <yosryahmed@google.com>]

On Fri, Jul 22, 2022 at 9:20 AM Alexei Starovoitov
<alexei.starovoitov@gmail.com> wrote:
>
> On Thu, Jul 21, 2022 at 7:13 PM Yosry Ahmed <yosryahmed@google.com> wrote:
> >
> > From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
> >
> > This allows to declare a kfunc as sleepable and prevents its use in
> > a non sleepable program.
> >
> > Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
> > Signed-off-by: Yosry Ahmed <yosryahmed@google.com>
> > ---
> >  include/linux/btf.h |  2 ++
> >  kernel/bpf/btf.c    | 13 +++++++++++--
> >  2 files changed, 13 insertions(+), 2 deletions(-)
> >
> > diff --git a/include/linux/btf.h b/include/linux/btf.h
> > index 1bfed7fa0428..6e7517573d9e 100644
> > --- a/include/linux/btf.h
> > +++ b/include/linux/btf.h
> > @@ -18,6 +18,7 @@ enum btf_kfunc_type {
> >         BTF_KFUNC_TYPE_RELEASE,
> >         BTF_KFUNC_TYPE_RET_NULL,
> >         BTF_KFUNC_TYPE_KPTR_ACQUIRE,
> > +       BTF_KFUNC_TYPE_SLEEPABLE,
> >         BTF_KFUNC_TYPE_MAX,
> >  };
>
> This patch needs refactoring using the new BTF_ID_FLAGS scheme.
> When you do that please update the Documentation/bpf/kfuncs.rst as well.
>
> Thanks!

Sent v5 rebased on top of the new kfunc flags infrastructure, and
added documentation for sleepable kfuncs.