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

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Date:   Sat, 17 Dec 2022 17:32:49 +0800
From:   Changbin Du <changbin.du@...il.com>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc:     Changbin Du <changbin.du@...il.com>,
        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 Wed, Nov 30, 2022 at 04:52:11PM -0800, Andrii Nakryiko wrote:
> 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
>
Will be fixed, thanks.

> > 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
> 
sure, I'll send a standalone patch to 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
> >

-- 
Cheers,
Changbin Du