linux-kernel - [PATCH 06/24] perf tools: Add build_id__is

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Message-Id: <20201117110053.1303113-7-jolsa@kernel.org>
Date:   Tue, 17 Nov 2020 12:00:35 +0100
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>,
        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 06/24] 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 | 7 +++++++
 tools/perf/util/build-id.h | 1 +
 2 files changed, 8 insertions(+)

diff --git a/tools/perf/util/build-id.c b/tools/perf/util/build-id.c
index 6b410c3d52dc..7d9ecc37849c 100644
--- a/tools/perf/util/build-id.c
+++ b/tools/perf/util/build-id.c
@@ -912,3 +912,10 @@ void build_id__init(struct build_id *bid, const u8 *data, size_t size)
 	memcpy(bid->data, data, size);
 	bid->size = size;
 }
+
+bool build_id__is_defined(const struct build_id *bid)
+{
+	static u8 zero[BUILD_ID_SIZE];
+
+	return bid && bid->size ? memcmp(bid->data, &zero, bid->size) : false;
+}
diff --git a/tools/perf/util/build-id.h b/tools/perf/util/build-id.h
index f293f99d5dba..d53415feaf69 100644
--- a/tools/perf/util/build-id.h
+++ b/tools/perf/util/build-id.h
@@ -21,6 +21,7 @@ struct feat_fd;
 
 void build_id__init(struct build_id *bid, const u8 *data, size_t size);
 int build_id__sprintf(const struct build_id *build_id, char *bf);
+bool build_id__is_defined(const struct build_id *bid);
 int sysfs__sprintf_build_id(const char *root_dir, char *sbuild_id);
 int filename__sprintf_build_id(const char *pathname, char *sbuild_id);
 char *build_id_cache__kallsyms_path(const char *sbuild_id, char *bf,
-- 
2.26.2