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

Changbin Du
2022-12-20T01:37:21Z

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@gmail.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