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

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Message-ID: <CAJD7tkaSx9Oc3WC1C3BObRRXgsj6gvG6hRj9oL-P_BeWXvjS-A@mail.gmail.com>
Date:   Fri, 22 Jul 2022 10:49:52 -0700
From:   Yosry Ahmed <yosryahmed@...gle.com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Hao Luo <haoluo@...gle.com>, Tejun Heo <tj@...nel.org>,
        Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Shuah Khan <shuah@...nel.org>,
        Michal Hocko <mhocko@...nel.org>,
        KP Singh <kpsingh@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        John Fastabend <john.fastabend@...il.com>,
        Michal Koutný <mkoutny@...e.com>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        David Rientjes <rientjes@...gle.com>,
        Stanislav Fomichev <sdf@...gle.com>,
        Greg Thelen <gthelen@...gle.com>,
        Shakeel Butt <shakeelb@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>,
        "open list:CONTROL GROUP (CGROUP)" <cgroups@...r.kernel.org>
Subject: Re: [PATCH bpf-next v4 1/8] btf: Add a new kfunc set which allows to
 mark a function to be sleepable

On Fri, Jul 22, 2022 at 9:20 AM Alexei Starovoitov
<alexei.starovoitov@...il.com> wrote:
>
> On Thu, Jul 21, 2022 at 7:13 PM Yosry Ahmed <yosryahmed@...gle.com> wrote:
> >
> > From: Benjamin Tissoires <benjamin.tissoires@...hat.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@...hat.com>
> > Signed-off-by: Yosry Ahmed <yosryahmed@...gle.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.