linux-kernel - [PATCH 05/26] perf tools: Add build_id__is

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Date:   Sun, 13 Sep 2020 23:02:52 +0200
From:   Jiri Olsa <jolsa@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Ingo Molnar <mingo@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Michael Petlan <mpetlan@...hat.com>,
        Song Liu <songliubraving@...com>,
        "Frank Ch. Eigler" <fche@...hat.com>,
        Ian Rogers <irogers@...gle.com>,
        Stephane Eranian <eranian@...gle.com>,
        Alexey Budankov <alexey.budankov@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Adrian Hunter <adrian.hunter@...el.com>
Subject: [PATCH 05/26] perf tools: Add build_id__is_defined function

Adding build_id__is_defined helper to check build id
is defined and is != zero build id.

Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 tools/perf/util/build-id.c | 11 +++++++++++
 tools/perf/util/build-id.h |  1 +
 2 files changed, 12 insertions(+)

diff --git a/tools/perf/util/build-id.c b/tools/perf/util/build-id.c
index 31207b6e2066..bdee4e08e60d 100644
--- a/tools/perf/util/build-id.c
+++ b/tools/perf/util/build-id.c
@@ -902,3 +902,14 @@ bool perf_session__read_build_ids(struct perf_session *session, bool with_hits)
 
 	return ret;
 }
+
+bool build_id__is_defined(const u8 *build_id)
+{
+	static u8 zero[BUILD_ID_SIZE];
+	int err = 0;
+
+	if (build_id)
+		err = memcmp(build_id, &zero, BUILD_ID_SIZE);
+
+	return err ? true : false;
+}
diff --git a/tools/perf/util/build-id.h b/tools/perf/util/build-id.h
index aad419bb165c..1ceede45c231 100644
--- a/tools/perf/util/build-id.h
+++ b/tools/perf/util/build-id.h
@@ -14,6 +14,7 @@ extern struct perf_tool build_id__mark_dso_hit_ops;
 struct dso;
 struct feat_fd;
 
+bool build_id__is_defined(const u8 *build_id);
 int build_id__sprintf(const u8 *build_id, int len, char *bf);
 int sysfs__sprintf_build_id(const char *root_dir, char *sbuild_id);
 int filename__sprintf_build_id(const char *pathname, char *sbuild_id);
-- 
2.26.2