linux-kernel - Re: [PATCH v2 2/2] bpf: makefiles: do not generate empty vmlinux.h

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Message-ID: <CAEf4BzZPZeeGJTZC3NSm+Km4RZirGrwr8d8dXepLmBLTiUn8Hg@mail.gmail.com>
Date:   Wed, 30 Nov 2022 16:52:11 -0800
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Changbin Du <changbin.du@...il.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Quentin Monnet <quentin@...valent.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Shuah Khan <shuah@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        bpf@...r.kernel.org, linux-kernel@...r.kernel.org,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Mykola Lysenko <mykolal@...com>,
        linux-perf-users@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v2 2/2] bpf: makefiles: do not generate empty vmlinux.h

On Tue, Nov 29, 2022 at 5:42 AM Changbin Du <changbin.du@...il.com> wrote:
>
> Remove the empty vmlinux.h if bpftool failed to dump btf info.
> The emptry vmlinux.h can hide real error when reading output

typo: empty

> of make.
>
> This is done by adding .DELETE_ON_ERROR special target in related
> makefiles.
>
> Signed-off-by: Changbin Du <changbin.du@...il.com>
> ---
>  tools/bpf/bpftool/Makefile           | 3 +++
>  tools/perf/Makefile.perf             | 2 ++
>  tools/testing/selftests/bpf/Makefile | 3 +++
>  3 files changed, 8 insertions(+)
>
> diff --git a/tools/bpf/bpftool/Makefile b/tools/bpf/bpftool/Makefile
> index 4a95c017ad4c..f6b1e65085db 100644
> --- a/tools/bpf/bpftool/Makefile
> +++ b/tools/bpf/bpftool/Makefile
> @@ -265,3 +265,6 @@ FORCE:
>  .PHONY: all FORCE bootstrap clean install-bin install uninstall
>  .PHONY: doc doc-clean doc-install doc-uninstall
>  .DEFAULT_GOAL := all
> +
> +# Delete partially updated (corrupted) files on error
> +.DELETE_ON_ERROR:
> diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
> index a432e59afc42..265254fc641a 100644
> --- a/tools/perf/Makefile.perf
> +++ b/tools/perf/Makefile.perf
> @@ -1149,3 +1149,5 @@ FORCE:
>  .PHONY: libtraceevent_plugins archheaders
>
>  endif # force_fixdep
> +
> +.DELETE_ON_ERROR:

please split out perf changes, they should go through perf tree

> diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
> index e6cf21fad69f..f41c4b011221 100644
> --- a/tools/testing/selftests/bpf/Makefile
> +++ b/tools/testing/selftests/bpf/Makefile
> @@ -617,3 +617,6 @@ EXTRA_CLEAN := $(TEST_CUSTOM_PROGS) $(SCRATCH_DIR) $(HOST_SCRATCH_DIR)      \
>                                liburandom_read.so)
>
>  .PHONY: docs docs-clean
> +
> +# Delete partially updated (corrupted) files on error
> +.DELETE_ON_ERROR:
> --
> 2.37.2
>