linux-kernel - Re: [PATCH v3 2/2] bpf: makefiles: do not generate empty vmlinux.h

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Message-ID: <20221220012647.oytzq7q6ahwfhdow@mail.google.com>
Date:   Tue, 20 Dec 2022 09:26:47 +0800
From:   Changbin Du <changbin.du@...il.com>
To:     Leo Yan <leo.yan@...aro.org>
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 v3 2/2] bpf: makefiles: do not generate empty vmlinux.h

On Mon, Dec 19, 2022 at 11:59:38AM +0800, Leo Yan wrote:
> On Sun, Dec 18, 2022 at 06:35:09AM +0800, Changbin Du wrote:
> > Remove the empty vmlinux.h if bpftool failed to dump btf info.
> > The empty vmlinux.h can hide real error when reading output
> > of make.
> > 
> > This is done by adding .DELETE_ON_ERROR special target in related
> > makefiles.
> 
> We need to handle the same case for perf building, its makefile
> linux/tools/perf/Makefile.perf also uses bpftool to generate
> vmlinux.h, see:
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/tools/perf/Makefile.perf#n1067
> 
> Please consider to use a separate patch to add the same change in
> Makefile.perf?
>
It's alreay there.
https://lore.kernel.org/lkml/20221217225151.90387-1-changbin.du@gmail.com/T/

> Thanks,
> Leo
> 
> > Signed-off-by: Changbin Du <changbin.du@...il.com>
> > ---
> >  tools/bpf/bpftool/Makefile           | 3 +++
> >  tools/testing/selftests/bpf/Makefile | 3 +++
> >  2 files changed, 6 insertions(+)
> > 
> > diff --git a/tools/bpf/bpftool/Makefile b/tools/bpf/bpftool/Makefile
> > index 787b857d3fb5..313fd1b09189 100644
> > --- a/tools/bpf/bpftool/Makefile
> > +++ b/tools/bpf/bpftool/Makefile
> > @@ -289,3 +289,6 @@ 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/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
> > index c22c43bbee19..205e8c3c346a 100644
> > --- a/tools/testing/selftests/bpf/Makefile
> > +++ b/tools/testing/selftests/bpf/Makefile
> > @@ -626,3 +626,6 @@ 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