linux-kernel - Re: [PATCH v1 0/3] Bring back vmlinux.h generation

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Message-ID: <CAP-5=fUj9eTGLDxEpc=Xp082O-mQ_4ALp=2VPFHCvAVq8gO-JQ@mail.gmail.com>
Date:   Mon, 5 Jun 2023 10:18:51 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        James Clark <james.clark@....com>,
        Tiezhu Yang <yangtiezhu@...ngson.cn>,
        Yang Jihong <yangjihong1@...wei.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        bpf@...r.kernel.org
Subject: Re: [PATCH v1 0/3] Bring back vmlinux.h generation

On Mon, May 22, 2023 at 4:35 PM Andrii Nakryiko
<andrii.nakryiko@...il.com> wrote:
>
> On Mon, May 22, 2023 at 1:41 PM Ian Rogers <irogers@...gle.com> wrote:
> >
> > Commit 760ebc45746b ("perf lock contention: Add empty 'struct rq' to
> > satisfy libbpf 'runqueue' type verification") inadvertently created a
> > declaration of 'struct rq' that conflicted with a generated
> > vmlinux.h's:
> >
> > ```
> > util/bpf_skel/lock_contention.bpf.c:419:8: error: redefinition of 'rq'
> > struct rq {};
> >        ^
> > /tmp/perf/util/bpf_skel/.tmp/../vmlinux.h:45630:8: note: previous definition is here
> > struct rq {
> >        ^
> > 1 error generated.
> > ```
> >
> > Fix the issue by moving the declaration to vmlinux.h. So this can't
> > happen again, bring back build support for generating vmlinux.h then
> > add build tests.
> >
> > Ian Rogers (3):
> >   perf build: Add ability to build with a generated vmlinux.h
> >   perf bpf: Move the declaration of struct rq
> >   perf test: Add build tests for BUILD_BPF_SKEL
> >
> >  tools/perf/Makefile.config                       |  4 ++++
> >  tools/perf/Makefile.perf                         | 16 +++++++++++++++-
> >  tools/perf/tests/make                            |  4 ++++
> >  tools/perf/util/bpf_skel/.gitignore              |  1 +
> >  tools/perf/util/bpf_skel/lock_contention.bpf.c   |  2 --
> >  tools/perf/util/bpf_skel/{ => vmlinux}/vmlinux.h | 10 ++++++++++
> >  6 files changed, 34 insertions(+), 3 deletions(-)
> >  rename tools/perf/util/bpf_skel/{ => vmlinux}/vmlinux.h (90%)
> >
> > --
> > 2.40.1.698.g37aff9b760-goog
> >
> >
>
> LGTM, for the series:
>
> Acked-by: Andrii Nakryiko <andrii@...nel.org>

Arnaldo, could we take this set?

Thanks,
Ian