linux-kernel - Re: [PATCH 0/3] Dynptr Verifier Adjustments

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Date:   Wed, 26 Apr 2023 16:39:19 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Daniel Rosenberg <drosen@...gle.com>
Cc:     bpf@...r.kernel.org, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        John Fastabend <john.fastabend@...il.com>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        Shuah Khan <shuah@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        Joanne Koong <joannelkoong@...il.com>,
        Mykola Lysenko <mykolal@...com>, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org, kernel-team@...roid.com
Subject: Re: [PATCH 0/3] Dynptr Verifier Adjustments

On Wed, Apr 26, 2023 at 3:07 PM Daniel Rosenberg <drosen@...gle.com> wrote:
>
> >
> > It is expected that you build the freshest vmlinux image before
> > building selftests, because we generate vmlinux.h from it. In your
> > case we generated vmlinux.h from your system-wide
> > /sys/kernel/btf/vmlinux BTF information, which doesn't yet have latest
> > UAPI enums.
> >
> I'm still unable to build the selftests. I've got it pointed to a
> locally built kernel built using the config/config.x86_64, and have
> tried running the vmtest.sh script, and building just the tests via
> make. I'm using O= to direct it to the out directory for the kernel
> build. I've been hitting various errors when trying this. Confusingly
> the error message isn't always the same. Currently from a clean build,
> it complains about "linux/atomic.h" not found via #include
> "../../../include/linux/filter.h"'s in various files. Other times it's
> complained about the various helper functions from bpf_helper_defs.h
> being unused.
>
> I'm not sure if I'm invoking the command wrong, or missing
> dependencies or something. I got past some earlier issues by updating
> clang. Any idea what I'm doing wrong?

Don't know, show the sequence of commands you are running?

I have linux source in ~/linux, and KBUILD_OUTPUT set to
~/linux-build/default. And it only takes this:

$ cd ~/linux
$ make -j90 # build kernel
$ cd tools/testing/selftests/bpf
$ make -j90 # build selftests

And that's it.