netdev - Re: [PATCH bpf-next 4/4] kbuild: Add resolve

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Date:   Wed, 10 Feb 2021 09:52:42 -0800
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Nathan Chancellor <nathan@...nel.org>
Cc:     Jiri Olsa <jolsa@...nel.org>, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andriin@...com>,
        Song Liu <songliubraving@...com>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Martin KaFai Lau <kafai@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>
Subject: Re: [PATCH bpf-next 4/4] kbuild: Add resolve_btfids clean to root
 clean target

On Wed, Feb 10, 2021 at 9:47 AM Nathan Chancellor <nathan@...nel.org> wrote:
>
> On Fri, Feb 05, 2021 at 01:40:20PM +0100, Jiri Olsa wrote:
> > The resolve_btfids tool is used during the kernel build,
> > so we should clean it on kernel's make clean.
> >
> > Invoking the the resolve_btfids clean as part of root
> > 'make clean'.
> >
> > Acked-by: Song Liu <songliubraving@...com>
> > Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> > ---
> >  Makefile | 7 ++++++-
> >  1 file changed, 6 insertions(+), 1 deletion(-)
> >
> > diff --git a/Makefile b/Makefile
> > index b0e4767735dc..159d9592b587 100644
> > --- a/Makefile
> > +++ b/Makefile
> > @@ -1086,6 +1086,11 @@ ifdef CONFIG_STACK_VALIDATION
> >    endif
> >  endif
> >
> > +PHONY += resolve_btfids_clean
> > +
> > +resolve_btfids_clean:
> > +     $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(abspath $(objtree))/tools/bpf/resolve_btfids clean
> > +
> >  ifdef CONFIG_BPF
> >  ifdef CONFIG_DEBUG_INFO_BTF
> >    ifeq ($(has_libelf),1)
> > @@ -1495,7 +1500,7 @@ vmlinuxclean:
> >       $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
> >       $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
> >
> > -clean: archclean vmlinuxclean
> > +clean: archclean vmlinuxclean resolve_btfids_clean
> >
> >  # mrproper - Delete all generated files, including .config
> >  #
> > --
> > 2.26.2
> >
>
> This breaks running distclean on a clean tree (my script just
> unconditionally runs distclean regardless of the tree state):
>
> $ make -s O=build distclean
> ../../scripts/Makefile.include:4: *** O=/home/nathan/cbl/src/linux-next/build/tools/bpf/resolve_btfids does not exist.  Stop.
>

Can't reproduce it. It works in all kinds of variants (relative and
absolute O=, clean and not clean trees, etc). Jiri, please check as
well.

> Cheers,
> Nathan