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Sender: Ingo Molnar <mingo.kernel.org@gmail.com>
Date: Wed, 5 Jun 2024 09:09:39 +0200
From: Ingo Molnar <mingo@kernel.org>
To: Ian Rogers <irogers@google.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>,
	Adrian Hunter <adrian.hunter@intel.com>,
	Jiri Olsa <jolsa@kernel.org>, Kan Liang <kan.liang@linux.intel.com>,
	Namhyung Kim <namhyung@kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	linux-perf-users@vger.kernel.org
Subject: Re: Makefile.perf:1149: *** Missing bpftool input for generating
 vmlinux.h. Stop.
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* Ingo Molnar <mingo@kernel.org> wrote:

> 
> * Ian Rogers <irogers@google.com> wrote:
> 
> > > Was this regression fix propagated to v6.9 in time?
> > 
> > We switched to using the handwritten file in v6.4:
> > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/tools/perf/util/bpf_skel/vmlinux.h?id=a887466562b425bd6183bf75b523c1477c9fd22d
> 
> So there must be some different regression then, as this is readily 
> reproducible for me on v6.9, as per the build log below - I simply 
> Ctrl-C-ed a build, and the next build results in:
> 
>   kepler:~/tip/tools/perf> make clean install
>   Makefile.perf:1149: *** Missing bpftool input for generating vmlinux.h.  Stop.
>   make: *** [Makefile:90: clean] Error 2
>   kepler:~/tip/tools/perf> 

This happens easily on latest upstream v6.10-rc1 as well:

  kepler:~/tip> perfi
  Makefile.perf:1173: *** Missing bpftool input for generating vmlinux.h.  Stop.
  make: *** [Makefile:90: clean] Error 2
  kepler:~/tip> 

What's going on here?

Thanks,

	Ingo