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perf stat: Fix error return code in bperf__load() 

Fix to return a negative error code from the error handling case instead
of 0, as done elsewhere in this function.

Committer notes:

Added the missing {} for the now multiline 'if' block, fixing this error:

    CC      /tmp/build/perf/util/bpf_counter.o
  util/bpf_counter.c: In function ‘bperf__load’:
  util/bpf_counter.c:523:9: error: this ‘if’ clause does not guard... [-Werror=misleading-indentation]
    523 |         if (evsel->bperf_leader_link_fd < 0 &&
        |         ^~
  util/bpf_counter.c:526:17: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the ‘if’
    526 |                 goto out;
        |                 ^~~~
  cc1: all warnings being treated as errors

Fixes: 7fac83aaf2 ("perf stat: Introduce 'bperf' to share hardware PMCs with BPF")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Andrii Nakryiko <andrii@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Song Liu <songliubraving@fb.com>
Cc: Yu Kuai <yukuai3@huawei.com>
Cc: Zhang Yi <yi.zhang@huawei.com>
Link: http://lore.kernel.org/lkml/20210517081254.1561564-1-yukuai3@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Yu Kuai 2021-05-17 16:12:54 +08:00 committed by Arnaldo Carvalho de Melo
parent 4f2abe9192
commit d3fddc355a
1 changed files with 4 additions and 2 deletions
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6
tools/perf/util/bpf_counter.c
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@ -521,9 +521,10 @@ static int bperf__load(struct evsel *evsel, struct target *target)
evsel->bperf_leader_link_fd = bpf_link_get_fd_by_id(entry.link_id);
if (evsel->bperf_leader_link_fd < 0 &&
bperf_reload_leader_program(evsel, attr_map_fd, &entry))
bperf_reload_leader_program(evsel, attr_map_fd, &entry)) {
err = -1;
goto out;
}
/*
* The bpf_link holds reference to the leader program, and the
* leader program holds reference to the maps. Therefore, if
@ -550,6 +551,7 @@ static int bperf__load(struct evsel *evsel, struct target *target)
/* Step 2: load the follower skeleton */
evsel->follower_skel = bperf_follower_bpf__open();
if (!evsel->follower_skel) {
err = -1;
pr_err("Failed to open follower skeleton\n");
goto out;
}