netdev - [PATCH 2/2] libbpf: Avoid designated initializers for unnamed union members

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Message-Id: <20190719143407.20847-3-acme@kernel.org>
Date:   Fri, 19 Jul 2019 11:34:07 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>
Cc:     Clark Williams <williams@...hat.com>, bpf@...r.kernel.org,
        netdev@...r.kernel.org, Arnaldo Carvalho de Melo <acme@...hat.com>,
        Andrii Nakryiko <andriin@...com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>
Subject: [PATCH 2/2] libbpf: Avoid designated initializers for unnamed union members

From: Arnaldo Carvalho de Melo <acme@...hat.com>

As it fails to build in some systems with:

  libbpf.c: In function 'perf_buffer__new':
  libbpf.c:4515: error: unknown field 'sample_period' specified in initializer
  libbpf.c:4516: error: unknown field 'wakeup_events' specified in initializer

Doing as:

    attr.sample_period = 1;

I.e. not as a designated initializer makes it build everywhere.

Cc: Andrii Nakryiko <andriin@...com>
Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Daniel Borkmann <daniel@...earbox.net>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Fixes: fb84b8224655 ("libbpf: add perf buffer API")
Link: https://lkml.kernel.org/n/tip-hnlmch8qit1ieksfppmr32si@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/lib/bpf/libbpf.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index b1dec5b1de54..aaca132def74 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -4508,13 +4508,13 @@ struct perf_buffer *perf_buffer__new(int map_fd, size_t page_cnt,
 				     const struct perf_buffer_opts *opts)
 {
 	struct perf_buffer_params p = {};
-	struct perf_event_attr attr = {
-		.config = PERF_COUNT_SW_BPF_OUTPUT,
-		.type = PERF_TYPE_SOFTWARE,
-		.sample_type = PERF_SAMPLE_RAW,
-		.sample_period = 1,
-		.wakeup_events = 1,
-	};
+	struct perf_event_attr attr = { 0, };
+
+	attr.config = PERF_COUNT_SW_BPF_OUTPUT,
+	attr.type = PERF_TYPE_SOFTWARE;
+	attr.sample_type = PERF_SAMPLE_RAW;
+	attr.sample_period = 1;
+	attr.wakeup_events = 1;
 
 	p.attr = &attr;
 	p.sample_cb = opts ? opts->sample_cb : NULL;
-- 
2.21.0