linux-kernel - [PATCH v1 18/48] perf cs-etm: Silence -Wshorten-64-to-32 warnings

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Message-ID: <20250401182347.3422199-19-irogers@google.com>
Date: Tue,  1 Apr 2025 11:23:16 -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>, 
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	Casey Chen <cachen@...estorage.com>, "Dr. David Alan Gilbert" <linux@...blig.org>, 
	Li Huafei <lihuafei1@...wei.com>, "Steinar H. Gunderson" <sesse@...gle.com>, Levi Yun <yeoreum.yun@....com>, 
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	Thomas Richter <tmricht@...ux.ibm.com>, Andrew Kreimer <algonell@...il.com>, 
	"Krzysztof Łopatowski" <krzysztof.m.lopatowski@...il.com>, 
	Christophe Leroy <christophe.leroy@...roup.eu>, 
	Jean-Philippe Romain <jean-philippe.romain@...s.st.com>, Junhao He <hejunhao3@...wei.com>, 
	"Masami Hiramatsu (Google)" <mhiramat@...nel.org>, Xu Yang <xu.yang_2@....com>, 
	Steve Clevenger <scclevenger@...amperecomputing.com>, Zixian Cai <fzczx123@...il.com>, 
	Stephen Brennan <stephen.s.brennan@...cle.com>, Yujie Liu <yujie.liu@...el.com>, 
	linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, llvm@...ts.linux.dev
Subject: [PATCH v1 18/48] perf cs-etm: 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/util/cs-etm-base.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/cs-etm-base.c b/tools/perf/util/cs-etm-base.c
index 4abe416e3feb..3aa1ccc9e452 100644
--- a/tools/perf/util/cs-etm-base.c
+++ b/tools/perf/util/cs-etm-base.c
@@ -101,7 +101,7 @@ static int cs_etm__print_cpu_metadata_v1(u64 *val, int *offset)
 
 	magic = val[i + CS_ETM_MAGIC];
 	/* total params to print is NR_PARAMS + common block size for v1 */
-	total_params = val[i + CS_ETM_NR_TRC_PARAMS] + CS_ETM_COMMON_BLK_MAX_V1;
+	total_params = (int)val[i + CS_ETM_NR_TRC_PARAMS] + CS_ETM_COMMON_BLK_MAX_V1;
 
 	if (magic == __perf_cs_etmv3_magic) {
 		for (j = 0; j < total_params; j++, i++) {
@@ -140,7 +140,7 @@ static void cs_etm__print_auxtrace_info(u64 *val, int num)
 {
 	int i, cpu = 0, version, err;
 
-	version = val[0];
+	version = (int)val[0];
 
 	for (i = 0; i < CS_HEADER_VERSION_MAX; i++)
 		fprintf(stdout, cs_etm_global_header_fmts[i], val[i]);
-- 
2.49.0.504.g3bcea36a83-goog