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

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Date:   Mon, 28 Dec 2020 17:33:10 +0000
From:   Song Liu <songliubraving@...com>
To:     Jiri Olsa <jolsa@...hat.com>
CC:     lkml <linux-kernel@...r.kernel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "alexander.shishkin@...ux.intel.com" 
        <alexander.shishkin@...ux.intel.com>,
        "namhyung@...nel.org" <namhyung@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "Kernel Team" <Kernel-team@...com>
Subject: Re: [PATCH v5 2/4] perf: support build BPF skeletons with perf



> On Dec 28, 2020, at 4:55 AM, Jiri Olsa <jolsa@...hat.com> wrote:
> 
> 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

Yeah, we need the new name. When I sent v5, the patch that renamed the bootstrap 
bpftool was in bpf-next, but not in Arnaldo's perf/core. 

I will send v6 with this change included. 

Thanks,
Song