linux-kernel - Re: Makefile.perf:1149: *** Missing bpftool input for generating vmlinux.h. Stop.

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Date: Tue, 21 May 2024 10:07:40 -0700
From: Namhyung Kim <namhyung@...nel.org>
To: Ian Rogers <irogers@...gle.com>
Cc: Ingo Molnar <mingo@...nel.org>, Arnaldo Carvalho de Melo <acme@...nel.org>, 
	Adrian Hunter <adrian.hunter@...el.com>, Jiri Olsa <jolsa@...nel.org>, 
	Kan Liang <kan.liang@...ux.intel.com>, 
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, linux-perf-users@...r.kernel.org
Subject: Re: Makefile.perf:1149: *** Missing bpftool input for generating
 vmlinux.h. Stop.

Hi Ian and Ingo,

The failure happens when you don't have vmlinux.h or vmlinux with BTF.

ifeq ($(VMLINUX_H),)
  ifeq ($(VMLINUX_BTF),)
    $(error Missing bpftool input for generating vmlinux.h)
  endif
endif

VMLINUX_BTF can be empty if you didn't build a kernel or
it doesn't have a BTF section and the current kernel also
has no BTF.  This is totally ok.

But VMLINUX_H should be set to the minimal version in
the source tree (unless you overwrite it manually) when you
don't pass GEN_VMLINUX_H=1 (which requires VMLINUX_BTF
should not be empty).  The problem is that it's defined in
Makefile.config which is not included for `make clean`.

Can you please verify if the below patch fixes it?

Thanks,
Namhyung

---8<---

diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index 5c35c0d89306..e6d56b555369 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -214,6 +214,7 @@ NON_CONFIG_TARGETS := clean python-clean TAGS tags
cscope help

 ifdef MAKECMDGOALS
 ifeq ($(filter-out $(NON_CONFIG_TARGETS),$(MAKECMDGOALS)),)
+  VMLINUX_H=$(src-perf)/util/bpf_skel/vmlinux/vmlinux.h
   config := 0
 endif
 endif