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Date: Wed, 29 Nov 2017 13:07:34 -0800 From: Martin KaFai Lau <kafai@...com> To: Arnaldo Carvalho de Melo <acme@...nel.org> CC: Matthias Kaehlcke <mka@...omium.org>, Josh Poimboeuf <jpoimboe@...hat.com>, Yonghong Song <yhs@...com>, Alexei Starovoitov <ast@...com>, "David S. Miller" <davem@...emloft.net>, Daniel Borkmann <daniel@...earbox.net>, Wang Nan <wangnan0@...wei.com>, Alexei Starovoitov <alexei.starovoitov@...il.com>, Adrian Hunter <adrian.hunter@...el.com>, David Ahern <dsahern@...il.com>, Jiri Olsa <jolsa@...nel.org>, Ingo Molnar <mingo@...nel.org>, Namhyung Kim <namhyung@...nel.org>, "Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>, Andrey Ryabinin <aryabinin@...tuozzo.com> Subject: Re: 'perf test BPF' failing, libbpf regression wrt "basic API for BPF obj name" On Tue, Nov 28, 2017 at 04:05:19PM -0300, Arnaldo Carvalho de Melo wrote: > > [root@...et ~]# perf test -v bpf > 39: BPF filter : > 39.1: Basic BPF filtering : > --- start --- > test child forked, pid 12198 > Kernel build dir is set to /lib/modules/4.14.0+/build > set env: KBUILD_DIR=/lib/modules/4.14.0+/build [ ... ] > libbpf: failed to create map (name: 'flip_table'): Invalid argument > libbpf: failed to load object '[basic_bpf_test]' > bpf: load objects failed 88cda1c9da02 ("bpf: libbpf: Provide basic API support to specify BPF obj name") is introduced in 4.15. I think the perf@...nel-4.15 broke on older kernels like 4.14 because the new bpf prog/map name is only introduced since 4.15. The newer perf needs to be compatible with an older kernel?
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