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

[Ian Rogers <irogers@google.com>]

On Wed, May 8, 2024 at 12:39 AM Ingo Molnar <mingo@kernel.org> wrote:
>
>
> So I've been getting this perf build failure for some time:
>
>   kepler:~/tip/tools/perf> make clean
>   Makefile.perf:1149: *** Missing bpftool input for generating vmlinux.h.  Stop.
>   make: *** [Makefile:90: clean] Error 2
>
> ... but if I clone a new repository, it works fine, until a point.
>
> 'make clean' doesn't work - and 'make mrproper' in the main kernel
> directory doesn't clean up properly.
>
> Only if I do a brute-force:
>
>         rm -rf tools/
>         git checkout HEAD -f
>
> does it get resolved.
>
> The failure condition triggers if I Ctrl-C the following build a couple of
> times, without it being finished:
>
>
>    cd tools/perf; make clean install
>    ...
>
>    LD      util/perf-in.o
>    LD      perf-in.o
>    CC      pmu-events/pmu-events.o
>  ^Cmake[3]: *** [pmu-events/Build:43: pmu-events/pmu-events.o] Interrupt
>  make[2]: *** [Makefile.perf:709: pmu-events/pmu-events-in.o] Interrupt
>  make[1]: *** [Makefile.perf:264: sub-make] Interrupt
>  make: *** [Makefile:113: install] Interrupt
>  kepler:~/tip> perfi
>  Makefile.perf:1149: *** Missing bpftool input for generating vmlinux.h.  Stop.
>  make: *** [Makefile:90: clean] Error 2

We have a checked-in vmlinux.h:
https://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools-next.git/tree/tools/perf/util/bpf_skel/vmlinux/vmlinux.h?h=perf-tools-next
so this shouldn't have been a problem for a while. bpftool is no
longer on that line:
https://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools-next.git/tree/tools/perf/Makefile.perf?h=perf-tools-next#n1149
so I suspect if you use a newer tree then things will work.

Thanks,
Ian

> Thanks,
>
>         Ingo