linux-kernel - Re: [PATCH bpf-next] selftests/bpf: Fix building error when using userspace pt

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Message-ID: <CAEf4BzaQcHV3iY5XqEbt3ptw+KejVVEZ8gSmW7u46=xHnsTaPA@mail.gmail.com>
Date:   Wed, 15 Dec 2021 20:06:25 -0800
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Pu Lehui <pulehui@...wei.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>, Martin Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        john fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Shuah Khan <shuah@...nel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH bpf-next] selftests/bpf: Fix building error when using
 userspace pt_regs

On Tue, Dec 14, 2021 at 5:54 AM Pu Lehui <pulehui@...wei.com> wrote:
>
> When building bpf selftests on arm64, the following error will occur:
>
> progs/loop2.c:20:7: error: incomplete definition of type 'struct
> user_pt_regs'
>
> Some archs, like arm64 and riscv, use userspace pt_regs in
> bpf_tracing.h, which causes build failure when bpf prog use
> macro in bpf_tracing.h. So let's use vmlinux.h directly.

We could probably also extend bpf_tracing.h to work with
kernel-defined pt_regs, just like we do for x86 (see __KERNEL__ and
__VMLINUX_H__ checks). It's more work, but will benefit other end
users, not just selftests.

>
> Signed-off-by: Pu Lehui <pulehui@...wei.com>
> ---
>  tools/testing/selftests/bpf/progs/loop1.c     |  8 ++------
>  tools/testing/selftests/bpf/progs/loop2.c     |  8 ++------
>  tools/testing/selftests/bpf/progs/loop3.c     |  8 ++------
>  tools/testing/selftests/bpf/progs/loop6.c     | 20 ++++++-------------
>  .../selftests/bpf/progs/test_overhead.c       |  8 ++------
>  .../selftests/bpf/progs/test_probe_user.c     |  6 +-----
>  6 files changed, 15 insertions(+), 43 deletions(-)
>

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