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

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Date:   Mon, 5 Jun 2023 12:14:21 -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, Jun 5, 2023 at 11:55 AM Arnaldo Carvalho de Melo
<acme@...nel.org> wrote:
>
> Em Mon, Jun 05, 2023 at 10:18:51AM -0700, Ian Rogers escreveu:
> > 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?
>
> This one isn't applying right now on perf-tools-next.
>
> - Arnaldo

I'll rebase and resend.

Thanks,
Ian