linux-kernel - Re: [PATCH v2] perf bpf skels: Make vmlinux.h use bpf.h and perf

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Date:   Wed, 10 May 2023 12:40:38 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Yang Jihong <yangjihong1@...wei.com>
Cc:     peterz@...radead.org, mingo@...hat.com, mark.rutland@....com,
        alexander.shishkin@...ux.intel.com, jolsa@...nel.org,
        namhyung@...nel.org, irogers@...gle.com, adrian.hunter@...el.com,
        nathan@...nel.org, ndesaulniers@...gle.com, trix@...hat.com,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] perf bpf skels: Make vmlinux.h use bpf.h and
 perf_event.h in source directory

Em Wed, May 10, 2023 at 06:44:01AM +0000, Yang Jihong escreveu:
> Currently, vmlinux.h uses the bpf.h and perf_event.h header files in the
> system path. If the header files in compilation environment are old,
> compilation may fail. For example:
> 
>   /home/yangjihong/linux/tools/perf/util/bpf_skel/.tmp/../vmlinux.h:151:27: error: field has incomplete type 'union perf_sample_weight'
>           union perf_sample_weight weight;
> 
> Use the bpf.h and perf_event.h files in the source code directory to
> avoid compilation compatibility problems.

Applied, will test it in my build containers.

- Arnaldo
 
> Signed-off-by: Yang Jihong <yangjihong1@...wei.com>
> ---
> 
> Changes since v1:
>  - Use Makefile to specify that header files in tools/include/uapi directory are preferentially used.
> 
>  tools/perf/Makefile.perf           | 3 ++-
>  tools/perf/util/bpf_skel/vmlinux.h | 1 +
>  2 files changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
> index a42a6a99c2bc..9b92749280b2 100644
> --- a/tools/perf/Makefile.perf
> +++ b/tools/perf/Makefile.perf
> @@ -1058,13 +1058,14 @@ $(SKEL_TMP_OUT) $(LIBAPI_OUTPUT) $(LIBBPF_OUTPUT) $(LIBPERF_OUTPUT) $(LIBSUBCMD_
>  ifdef BUILD_BPF_SKEL
>  BPFTOOL := $(SKEL_TMP_OUT)/bootstrap/bpftool
>  BPF_INCLUDE := -I$(SKEL_TMP_OUT)/.. -I$(LIBBPF_INCLUDE)
> +TOOLS_UAPI_INCLUDE := -I$(srctree)/tools/include/uapi
>  
>  $(BPFTOOL): | $(SKEL_TMP_OUT)
>  	$(Q)CFLAGS= $(MAKE) -C ../bpf/bpftool \
>  		OUTPUT=$(SKEL_TMP_OUT)/ bootstrap
>  
>  $(SKEL_TMP_OUT)/%.bpf.o: util/bpf_skel/%.bpf.c $(LIBBPF) | $(SKEL_TMP_OUT)
> -	$(QUIET_CLANG)$(CLANG) -g -O2 -target bpf -Wall -Werror $(BPF_INCLUDE) \
> +	$(QUIET_CLANG)$(CLANG) -g -O2 -target bpf -Wall -Werror $(BPF_INCLUDE) $(TOOLS_UAPI_INCLUDE) \
>  	  -c $(filter util/bpf_skel/%.bpf.c,$^) -o $@ && $(LLVM_STRIP) -g $@
>  
>  $(SKEL_OUT)/%.skel.h: $(SKEL_TMP_OUT)/%.bpf.o | $(BPFTOOL)
> diff --git a/tools/perf/util/bpf_skel/vmlinux.h b/tools/perf/util/bpf_skel/vmlinux.h
> index 449b1ea91fc4..c7ed51b0c1ef 100644
> --- a/tools/perf/util/bpf_skel/vmlinux.h
> +++ b/tools/perf/util/bpf_skel/vmlinux.h
> @@ -1,6 +1,7 @@
>  #ifndef __VMLINUX_H
>  #define __VMLINUX_H
>  
> +#include <linux/stddef.h> // for define __always_inline
>  #include <linux/bpf.h>
>  #include <linux/types.h>
>  #include <linux/perf_event.h>
> -- 
> 2.30.GIT
> 

-- 

- Arnaldo