linux-kernel - Re: perf build broken seemingly due to libbpf changes, checking...

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Date:   Thu, 6 Jan 2022 16:44:14 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>,
        Ian Rogers <irogers@...gle.com>
Cc:     Song Liu <songliubraving@...com>, Jiri Olsa <jolsa@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>, bpf@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: perf build broken seemingly due to libbpf changes, checking...

Em Thu, Jan 06, 2022 at 04:34:46PM -0300, Arnaldo Carvalho de Melo escreveu:
> After merging torvalds/master to perf/urgent I'm getting this:
> 
> util/bpf-event.c:25:21: error: no previous prototype for ‘btf__load_from_kernel_by_id’ [-Werror=missing-prototypes]
>    25 | struct btf * __weak btf__load_from_kernel_by_id(__u32 id)
>       |                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~
> util/bpf-event.c:37:1: error: no previous prototype for ‘bpf_object__next_program’ [-Werror=missing-prototypes]
>    37 | bpf_object__next_program(const struct bpf_object *obj, struct bpf_program *prev)
>       | ^~~~~~~~~~~~~~~~~~~~~~~~
> util/bpf-event.c:46:1: error: no previous prototype for ‘bpf_object__next_map’ [-Werror=missing-prototypes]
>    46 | bpf_object__next_map(const struct bpf_object *obj, const struct bpf_map *prev)
>       | ^~~~~~~~~~~~~~~~~~~~
> util/bpf-event.c:55:1: error: no previous prototype for ‘btf__raw_data’ [-Werror=missing-prototypes]
>    55 | btf__raw_data(const struct btf *btf_ro, __u32 *size)
>       | ^~~~~~~~~~~~~
> cc1: all warnings being treated as errors
> make[4]: *** [/var/home/acme/git/perf/tools/build/Makefile.build:96: /tmp/build/perf/util/bpf-event.o] Error 1
> make[4]: *** Waiting for unfinished jobs....
> util/bpf_counter.c: In function ‘bpf_target_prog_name’:
> util/bpf_counter.c:82:15: error: implicit declaration of function ‘btf__load_from_kernel_by_id’ [-Werror=implicit-function-declaration]
>    82 |         btf = btf__load_from_kernel_by_id(info_linear->info.btf_id);
>       |               ^~~~~~~~~~~~~~~~~~~~~~~~~~~
> util/bpf_counter.c:82:13: error: assignment to ‘struct btf *’ from ‘int’ makes pointer from integer without a cast [-Werror=int-conversion]
>    82 |         btf = btf__load_from_kernel_by_id(info_linear->info.btf_id);
>       |             ^
> cc1: all warnings being treated as errors
> make[4]: *** [/var/home/acme/git/perf/tools/build/Makefile.build:96: /tmp/build/perf/util/bpf_counter.o] Error 1
> 
> I'm checking now...
> 
> BTW I test perf builds with:
> 
> make -k BUILD_BPF_SKEL=1 CORESIGHT=1 PYTHON=python3 O=/tmp/build/perf -C tools/perf install-bin && git status && perf test python

Nevermind, this was due to a patch by Ian Rogers I was testing,
bisecting get up to the last patch, since I had merged torvalds/master
today it got me to a wrong correlation, sorry for the disturbance.

For reference, this is the patch:

http://lore.kernel.org/lkml/20220106072627.476524-1-irogers@google.com

- Arnaldo