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

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

Thanks,

Ingo

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