linux-kernel - Re: [RFC 1/2] perf: support build BPF skeletons with perf

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Date:   Tue, 24 Nov 2020 23:53:39 +0000
From:   Song Liu <songliubraving@...com>
To:     Jiri Olsa <jolsa@...hat.com>
CC:     open list <linux-kernel@...r.kernel.org>,
        Kernel Team <Kernel-team@...com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "acme@...nel.org" <acme@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "alexander.shishkin@...ux.intel.com" 
        <alexander.shishkin@...ux.intel.com>,
        "namhyung@...nel.org" <namhyung@...nel.org>
Subject: Re: [RFC 1/2] perf: support build BPF skeletons with perf



> On Nov 24, 2020, at 11:51 AM, Jiri Olsa <jolsa@...hat.com> wrote:
> 
> On Wed, Nov 18, 2020 at 08:50:45PM -0800, Song Liu wrote:
> 
> SNIP
> 
>> +	$(Q)$(BPFTOOL) gen skeleton $< > $@
>> +
>> +$(TMP_OUTPUT)/%.bpf.o: %.bpf.c $(TMP_OUTPUT)/vmlinux.h $(BPFOBJ) | $(TMP_OUTPUT)
>> +	$(call msg,BPF,$@)
>> +	$(Q)$(CLANG) -g -O2 -target bpf $(INCLUDES)			      \
>> +		 -c $(filter %.c,$^) -o $@ &&				      \
>> +	$(LLVM_STRIP) -g $@
>> +
>> +$(TMP_OUTPUT):
>> +	$(call msg,MKDIR,$@)
>> +	$(Q)mkdir -p $(TMP_OUTPUT)
>> +
>> +$(TMP_OUTPUT)/vmlinux.h: $(VMLINUX_BTF_PATH) | $(TMP_OUTPUT) $(BPFTOOL)
> 
> please add support to specify VMLINUX_H as it is in selftests
> or bpftool, we will need it in out building setup
> 
> thanks,
> jirka

Let me try that. 

Thanks,
Song