linux-kernel - [PATCH v1 41/48] perf kvm: Silence -Wshorten-64-to-32 warnings

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Message-ID: <20250401182347.3422199-42-irogers@google.com>
Date: Tue,  1 Apr 2025 11:23:39 -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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	Al Viro <viro@...iv.linux.org.uk>, Kyle Meyer <kyle.meyer@....com>, 
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	Eder Zulian <ezulian@...hat.com>, Dapeng Mi <dapeng1.mi@...ux.intel.com>, 
	Kuan-Wei Chiu <visitorckw@...il.com>, He Zhe <zhe.he@...driver.com>, 
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	Andi Kleen <ak@...ux.intel.com>, Graham Woodward <graham.woodward@....com>, 
	Ilkka Koskinen <ilkka@...amperecomputing.com>, 
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	Gabriele Monaco <gmonaco@...hat.com>, Chun-Tse Shao <ctshao@...gle.com>, 
	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>, 
	Weilin Wang <weilin.wang@...el.com>, Thomas Falcon <thomas.falcon@...el.com>, 
	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 41/48] perf kvm: 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-kvm.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
index 67fd2b006b0b..a81874b7f2d3 100644
--- a/tools/perf/builtin-kvm.c
+++ b/tools/perf/builtin-kvm.c
@@ -928,7 +928,7 @@ struct vcpu_event_record *per_vcpu_record(struct thread *thread,
 			return NULL;
 		}
 
-		vcpu_record->vcpu_id = evsel__intval(evsel, sample, vcpu_id_str);
+		vcpu_record->vcpu_id = (int)evsel__intval(evsel, sample, vcpu_id_str);
 		thread__set_priv(thread, vcpu_record);
 	}
 
@@ -1337,7 +1337,7 @@ static int perf_kvm__handle_timerfd(struct perf_kvm_stat *kvm)
 	uint64_t c;
 	int rc;
 
-	rc = read(kvm->timerfd, &c, sizeof(uint64_t));
+	rc = (int)read(kvm->timerfd, &c, sizeof(uint64_t));
 	if (rc < 0) {
 		if (errno == EAGAIN)
 			return 0;
@@ -1558,7 +1558,7 @@ static int read_events(struct perf_kvm_stat *kvm)
 	kvm->session = perf_session__new(&file, &kvm->tool);
 	if (IS_ERR(kvm->session)) {
 		pr_err("Initializing perf session failed\n");
-		return PTR_ERR(kvm->session);
+		return (int)PTR_ERR(kvm->session);
 	}
 
 	symbol__init(&kvm->session->header.env);
@@ -1924,7 +1924,7 @@ static int kvm_events_live(struct perf_kvm_stat *kvm,
 	 */
 	kvm->session = perf_session__new(&data, &kvm->tool);
 	if (IS_ERR(kvm->session)) {
-		err = PTR_ERR(kvm->session);
+		err = (int)PTR_ERR(kvm->session);
 		goto out;
 	}
 	kvm->session->evlist = kvm->evlist;
-- 
2.49.0.504.g3bcea36a83-goog