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

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Date:   Wed, 10 Feb 2021 10:44:51 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Jiri Olsa <jolsa@...nel.org>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andriin@...com>,
        Song Liu <songliubraving@...com>, netdev@...r.kernel.org,
        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@...r.kernel.org
Subject: Re: [PATCH bpf-next 4/4] kbuild: Add resolve_btfids clean to root
 clean target

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.

Cheers,
Nathan