linux-kernel - Re: [PATCH v5 2/4] perf: support build BPF skeletons with perf

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Date:   Mon, 28 Dec 2020 13:55:54 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Song Liu <songliubraving@...com>
Cc:     linux-kernel@...r.kernel.org, acme@...nel.org,
        peterz@...radead.org, mingo@...hat.com,
        alexander.shishkin@...ux.intel.com, namhyung@...nel.org,
        mark.rutland@....com, kernel-team@...com
Subject: Re: [PATCH v5 2/4] perf: support build BPF skeletons with perf

On Tue, Dec 15, 2020 at 10:14:10AM -0800, Song Liu wrote:

SNIP

>  HOSTCC  ?= gcc
>  HOSTLD  ?= ld
>  HOSTAR  ?= ar
> +CLANG   ?= clang
> +LLVM_STRIP ?= llvm-strip
>  
>  PKG_CONFIG = $(CROSS_COMPILE)pkg-config
>  LLVM_CONFIG ?= llvm-config
> @@ -735,7 +739,8 @@ prepare: $(OUTPUT)PERF-VERSION-FILE $(OUTPUT)common-cmds.h archheaders $(drm_ioc
>  	$(x86_arch_prctl_code_array) \
>  	$(rename_flags_array) \
>  	$(arch_errno_name_array) \
> -	$(sync_file_range_arrays)
> +	$(sync_file_range_arrays) \
> +	bpf-skel
>  
>  $(OUTPUT)%.o: %.c prepare FORCE
>  	$(Q)$(MAKE) -f $(srctree)/tools/build/Makefile.build dir=$(build-dir) $@
> @@ -1008,7 +1013,43 @@ config-clean:
>  python-clean:
>  	$(python-clean)
>  
> -clean:: $(LIBTRACEEVENT)-clean $(LIBAPI)-clean $(LIBBPF)-clean $(LIBSUBCMD)-clean $(LIBPERF)-clean config-clean fixdep-clean python-clean
> +SKEL_OUT := $(abspath $(OUTPUT)util/bpf_skel)
> +SKEL_TMP_OUT := $(abspath $(SKEL_OUT)/.tmp)
> +SKELETONS :=
> +
> +ifdef BUILD_BPF_SKEL
> +BPFTOOL := $(SKEL_TMP_OUT)/bpftool-bootstrap

I think this needs to be:

  BPFTOOL := $(SKEL_TMP_OUT)/bootstrap/bpftool

otherwise it won't compile for me

jirka