linux-kernel - Re: [PATCH v2 1/2] perf build: Properly guard libbpf includes

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Date:   Fri, 6 Jan 2023 15:12:02 +0000
From:   Mike Leach <mike.leach@...aro.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Ian Rogers <irogers@...gle.com>, linux-perf-users@...r.kernel.org,
        linux-kernel@...r.kernel.org, bpf@...r.kernel.org,
        peterz@...radead.org, mingo@...hat.com, mark.rutland@....com,
        alexander.shishkin@...ux.intel.com, jolsa@...nel.org,
        namhyung@...nel.org
Subject: Re: [PATCH v2 1/2] perf build: Properly guard libbpf includes

On Fri, 6 Jan 2023 at 14:55, Arnaldo Carvalho de Melo <acme@...nel.org> wrote:
>
> Em Fri, Jan 06, 2023 at 06:25:36AM -0800, Ian Rogers escreveu:
> > Including libbpf header files should be guarded by
> > HAVE_LIBBPF_SUPPORT. In bpf_counter.h, move the skeleton utilities
> > under HAVE_BPF_SKEL.
> >
> > Fixes: d6a735ef3277 ("perf bpf_counter: Move common functions to bpf_counter.h")
> > Reported-by: Mike Leach <mike.leach@...aro.org>
> > Signed-off-by: Ian Rogers <irogers@...gle.com>
>
> Can this be done in a way that reduces patch size?
>
> - Arnaldo
>
> > ---
> >  tools/perf/builtin-trace.c    |  2 +
> >  tools/perf/util/bpf_counter.h | 85 ++++++++++++++++++-----------------
> >  2 files changed, 46 insertions(+), 41 deletions(-)
> >
> > diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
> > index 86e06f136f40..d21fe0f32a6d 100644
> > --- a/tools/perf/builtin-trace.c
> > +++ b/tools/perf/builtin-trace.c
> > @@ -16,7 +16,9 @@
> >
> >  #include "util/record.h"
> >  #include <api/fs/tracing_path.h>
> > +#ifdef HAVE_LIBBPF_SUPPORT
> >  #include <bpf/bpf.h>
> > +#endif
> >  #include "util/bpf_map.h"
> >  #include "util/rlimit.h"
> >  #include "builtin.h"
> > diff --git a/tools/perf/util/bpf_counter.h b/tools/perf/util/bpf_counter.h
> > index 4dbf26408b69..9113c8bf5cb0 100644
> > --- a/tools/perf/util/bpf_counter.h
> > +++ b/tools/perf/util/bpf_counter.h
> > @@ -4,9 +4,12 @@
> >
> >  #include <linux/list.h>
> >  #include <sys/resource.h>
> > +
> > +#ifdef HAVE_LIBBPF_SUPPORT
> >  #include <bpf/bpf.h>
> >  #include <bpf/btf.h>
> >  #include <bpf/libbpf.h>
> > +#endif
> >
> >  struct evsel;
> >  struct target;
> > @@ -42,6 +45,47 @@ int bpf_counter__read(struct evsel *evsel);
> >  void bpf_counter__destroy(struct evsel *evsel);
> >  int bpf_counter__install_pe(struct evsel *evsel, int cpu_map_idx, int fd);
> >
> > +static inline __u32 bpf_link_get_id(int fd)
> > +{
> > +     struct bpf_link_info link_info = { .id = 0, };
> > +     __u32 link_info_len = sizeof(link_info);
> > +
> > +     bpf_obj_get_info_by_fd(fd, &link_info, &link_info_len);
> > +     return link_info.id;
> > +}
> > +
> > +static inline __u32 bpf_link_get_prog_id(int fd)
> > +{
> > +     struct bpf_link_info link_info = { .id = 0, };
> > +     __u32 link_info_len = sizeof(link_info);
> > +
> > +     bpf_obj_get_info_by_fd(fd, &link_info, &link_info_len);
> > +     return link_info.prog_id;
> > +}
> > +
> > +static inline __u32 bpf_map_get_id(int fd)
> > +{
> > +     struct bpf_map_info map_info = { .id = 0, };
> > +     __u32 map_info_len = sizeof(map_info);
> > +
> > +     bpf_obj_get_info_by_fd(fd, &map_info, &map_info_len);
> > +     return map_info.id;
> > +}
> > +
> > +/* trigger the leader program on a cpu */
> > +static inline int bperf_trigger_reading(int prog_fd, int cpu)
> > +{
> > +     DECLARE_LIBBPF_OPTS(bpf_test_run_opts, opts,
> > +                         .ctx_in = NULL,
> > +                         .ctx_size_in = 0,
> > +                         .flags = BPF_F_TEST_RUN_ON_CPU,
> > +                         .cpu = cpu,
> > +                         .retval = 0,
> > +             );
> > +
> > +     return bpf_prog_test_run_opts(prog_fd, &opts);
> > +}
> > +
> >  #else /* HAVE_BPF_SKEL */
> >
> >  #include <linux/err.h>
> > @@ -87,45 +131,4 @@ static inline void set_max_rlimit(void)
> >       setrlimit(RLIMIT_MEMLOCK, &rinf);
> >  }
> >
> > -static inline __u32 bpf_link_get_id(int fd)
> > -{
> > -     struct bpf_link_info link_info = { .id = 0, };
> > -     __u32 link_info_len = sizeof(link_info);
> > -
> > -     bpf_obj_get_info_by_fd(fd, &link_info, &link_info_len);
> > -     return link_info.id;
> > -}
> > -
> > -static inline __u32 bpf_link_get_prog_id(int fd)
> > -{
> > -     struct bpf_link_info link_info = { .id = 0, };
> > -     __u32 link_info_len = sizeof(link_info);
> > -
> > -     bpf_obj_get_info_by_fd(fd, &link_info, &link_info_len);
> > -     return link_info.prog_id;
> > -}
> > -
> > -static inline __u32 bpf_map_get_id(int fd)
> > -{
> > -     struct bpf_map_info map_info = { .id = 0, };
> > -     __u32 map_info_len = sizeof(map_info);
> > -
> > -     bpf_obj_get_info_by_fd(fd, &map_info, &map_info_len);
> > -     return map_info.id;
> > -}
> > -
> > -/* trigger the leader program on a cpu */
> > -static inline int bperf_trigger_reading(int prog_fd, int cpu)
> > -{
> > -     DECLARE_LIBBPF_OPTS(bpf_test_run_opts, opts,
> > -                         .ctx_in = NULL,
> > -                         .ctx_size_in = 0,
> > -                         .flags = BPF_F_TEST_RUN_ON_CPU,
> > -                         .cpu = cpu,
> > -                         .retval = 0,
> > -             );
> > -
> > -     return bpf_prog_test_run_opts(prog_fd, &opts);
> > -}
> > -
> >  #endif /* __PERF_BPF_COUNTER_H */
> > --
> > 2.39.0.314.g84b9a713c41-goog
>

Tested-by: Mike Leach <mike.leach@...aro.org>

> --
>
> - Arnaldo


-- 
Mike Leach
Principal Engineer, ARM Ltd.
Manchester Design Centre. UK