linux-kernel - Re: [PATCH v4 0/4] Bring back vmlinux.h generation

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Date:   Sat, 24 Jun 2023 16:40:15 -0700
From:   Namhyung Kim <namhyung@...nel.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...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 v4 0/4] Bring back vmlinux.h generation

On Fri, Jun 23, 2023 at 5:41 PM Namhyung Kim <namhyung@...nel.org> wrote:
>
> On Thu, Jun 22, 2023 at 9:14 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.
> >
> > v4. Rebase and add Namhyung and Jiri's acked-by.
> > v3. Address Namhyung's comments on filtering ELF files with readelf.
> > v2. Rebase on perf-tools-next. Add Andrii's acked-by. Add patch to
> >     filter out kernels that lack a .BTF section and cause the build to
> >     break.
> >
> > Ian Rogers (4):
> >   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
> >   perf build: Filter out BTF sources without a .BTF section
>
> Thanks,  I'll take them with the following change.

Applied to perf-tools-next with it, thanks!