linux-kernel - Re: [PATCH v2] libbpf bpf_helpers: Use __builtin

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Date:   Tue, 21 Jul 2020 12:26:39 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc:     Ian Rogers <irogers@...gle.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Stanislav Fomichev <sdf@...gle.com>
Subject: Re: [PATCH v2] libbpf bpf_helpers: Use __builtin_offsetof for offsetof

On Sun, Jul 19, 2020 at 11:21 PM Andrii Nakryiko
<andrii.nakryiko@...il.com> wrote:
>
> On Sun, Jul 19, 2020 at 11:18 PM Ian Rogers <irogers@...gle.com> wrote:
> >
> > The non-builtin route for offsetof has a dependency on size_t from
> > stdlib.h/stdint.h that is undeclared and may break targets.
> > The offsetof macro in bpf_helpers may disable the same macro in other
> > headers that have a #ifdef offsetof guard. Rather than add additional
> > dependencies improve the offsetof macro declared here to use the
> > builtin that is available since llvm 3.7 (the first with a BPF backend).
> >
> > Signed-off-by: Ian Rogers <irogers@...gle.com>
> > ---
>
> Acked-by: Andrii Nakryiko <andriin@...com>

Applied. Thanks