linux-kernel - [PATCH v1 29/48] perf buildid: Silence -Wshorten-64-to-32 warnings

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Message-ID: <20250401182347.3422199-30-irogers@google.com>
Date: Tue,  1 Apr 2025 11:23:27 -0700
From: Ian Rogers <irogers@...gle.com>
To: Yury Norov <yury.norov@...il.com>, Rasmus Villemoes <linux@...musvillemoes.dk>, 
	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	Kan Liang <kan.liang@...ux.intel.com>, Thomas Gleixner <tglx@...utronix.de>, 
	Darren Hart <dvhart@...radead.org>, Davidlohr Bueso <dave@...olabs.net>, 
	"André Almeida" <andrealmeid@...lia.com>, John Garry <john.g.garry@...cle.com>, 
	Will Deacon <will@...nel.org>, James Clark <james.clark@...aro.org>, 
	Mike Leach <mike.leach@...aro.org>, Leo Yan <leo.yan@...ux.dev>, 
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	Nathan Chancellor <nathan@...nel.org>, Bill Wendling <morbo@...gle.com>, 
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	Casey Chen <cachen@...estorage.com>, "Dr. David Alan Gilbert" <linux@...blig.org>, 
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	linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, llvm@...ts.linux.dev
Subject: [PATCH v1 29/48] perf buildid: Silence -Wshorten-64-to-32 warnings

The clang warning -Wshorten-64-to-32 can be useful to catch
inadvertent truncation. In some instances this truncation can lead to
changing the sign of a result, for example, truncation to return an
int to fit a sort routine. Silence the warning by making the implicit
truncation explicit.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/builtin-buildid-cache.c | 2 +-
 tools/perf/builtin-buildid-list.c  | 2 +-
 tools/perf/util/build-id.c         | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/tools/perf/builtin-buildid-cache.c b/tools/perf/builtin-buildid-cache.c
index b0511d16aeb6..7f7ebd625ed6 100644
--- a/tools/perf/builtin-buildid-cache.c
+++ b/tools/perf/builtin-buildid-cache.c
@@ -450,7 +450,7 @@ int cmd_buildid_cache(int argc, const char **argv)
 
 		session = perf_session__new(&data, NULL);
 		if (IS_ERR(session))
-			return PTR_ERR(session);
+			return (int)PTR_ERR(session);
 	}
 
 	if (symbol__init(session ? &session->header.env : NULL) < 0)
diff --git a/tools/perf/builtin-buildid-list.c b/tools/perf/builtin-buildid-list.c
index 52dfacaff8e3..ef84d1adb98f 100644
--- a/tools/perf/builtin-buildid-list.c
+++ b/tools/perf/builtin-buildid-list.c
@@ -109,7 +109,7 @@ static int perf_session__list_build_ids(bool force, bool with_hits)
 
 	session = perf_session__new(&data, &build_id__mark_dso_hit_ops);
 	if (IS_ERR(session))
-		return PTR_ERR(session);
+		return (int)PTR_ERR(session);
 
 	/*
 	 * We take all buildids when the file contains AUX area tracing data
diff --git a/tools/perf/util/build-id.c b/tools/perf/util/build-id.c
index e763e8d99a43..6a3ae17b1ccf 100644
--- a/tools/perf/util/build-id.c
+++ b/tools/perf/util/build-id.c
@@ -81,7 +81,7 @@ int build_id__sprintf(const struct build_id *build_id, char *bf)
 		bid += 2;
 	}
 
-	return (bid - bf) + 1;
+	return (int)(bid - bf) + 1;
 }
 
 int sysfs__sprintf_build_id(const char *root_dir, char *sbuild_id)
-- 
2.49.0.504.g3bcea36a83-goog