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AJvYcCW9FsgeblXBbOZNXMpHaJvQZnYp82qSP5BPpG5DIqtif73rTO5ycIAxKQFXHzUYlnCqc89MK+broNnHlPs=@vger.kernel.org X-Gm-Message-State: AOJu0YyQdAVRXKyReqhHHfbztJCMWhIUE043qwITyHQ+Rd3vMGqxUOxI cVQdp5Ffecf6/qXXRKLCgrtuOxJpJdzuotpyFsYRB7NojzoNfI6brcmxYuVeizBK6m0yCVR2QDd kdyXV3w== X-Google-Smtp-Source: AGHT+IEsrz/KaBMv5972/PnVFS75LSjTuIhiZlIKgw8UI1qwxDb1rR4a1EvTReYHhxsnFHQO/ofbC87XKrhm X-Received: from oabfr13.prod.google.com ([2002:a05:6870:f80d:b0:2c2:5d77:108f]) (user=irogers job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6830:698a:b0:72b:946e:ccc7 with SMTP id 46e09a7af769-72c6366fefdmr8680020a34.0.1743531946761; Tue, 01 Apr 2025 11:25:46 -0700 (PDT) Date: Tue, 1 Apr 2025 11:23:33 -0700 In-Reply-To: <20250401182347.3422199-1-irogers@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250401182347.3422199-1-irogers@google.com> X-Mailer: git-send-email 2.49.0.504.g3bcea36a83-goog Message-ID: <20250401182347.3422199-36-irogers@google.com> Subject: [PATCH v1 35/48] perf ftrace: Silence -Wshorten-64-to-32 warnings From: Ian Rogers To: Yury Norov , Rasmus Villemoes , Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , Kan Liang , Thomas Gleixner , Darren Hart , Davidlohr Bueso , "=?UTF-8?q?Andr=C3=A9=20Almeida?=" , John Garry , Will Deacon , James Clark , Mike Leach , Leo Yan , Yicong Yang , Jonathan Cameron , Nathan Chancellor , Bill Wendling , Justin Stitt , Josh Poimboeuf , Al Viro , Kyle Meyer , Ben Gainey , Athira Rajeev , Kajol Jain , Aditya Gupta , Eder Zulian , Dapeng Mi , Kuan-Wei Chiu , He Zhe , Dirk Gouders , Brian Geffon , Ravi Bangoria , Howard Chu , Charlie Jenkins , Colin Ian King , Dominique Martinet , Jann Horn , Masahiro Yamada , Arnd Bergmann , Yang Jihong , Dmitry Vyukov , Andi Kleen , Graham Woodward , Ilkka Koskinen , Anshuman Khandual , Zhongqiu Han , Hao Ge , Tengda Wu , Gabriele Monaco , Chun-Tse Shao , Casey Chen , "Dr. David Alan Gilbert" , Li Huafei , "Steinar H. Gunderson" , Levi Yun , Weilin Wang , Thomas Falcon , Thomas Richter , Andrew Kreimer , "=?UTF-8?q?Krzysztof=20=C5=81opatowski?=" , Christophe Leroy , Jean-Philippe Romain , Junhao He , "Masami Hiramatsu (Google)" , Xu Yang , Steve Clevenger , Zixian Cai , Stephen Brennan , Yujie Liu , linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, linux-arm-kernel@lists.infradead.org, llvm@lists.linux.dev Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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 --- tools/perf/builtin-ftrace.c | 17 +++++++++++------ tools/perf/util/bpf_ftrace.c | 4 ++-- 2 files changed, 13 insertions(+), 8 deletions(-) diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c index 7caa18d5ffc3..1484d798de40 100644 --- a/tools/perf/builtin-ftrace.c +++ b/tools/perf/builtin-ftrace.c @@ -182,7 +182,8 @@ static int read_tracing_file_to_stdout(const char *name) =20 /* read contents to stdout */ while (true) { - int n =3D read(fd, buf, sizeof(buf)); + ssize_t n =3D read(fd, buf, sizeof(buf)); + if (n =3D=3D 0) break; else if (n < 0) @@ -449,7 +450,7 @@ static int set_tracing_percpu_buffer_size(struct perf_f= trace *ftrace) return 0; =20 ret =3D write_tracing_file_int("buffer_size_kb", - ftrace->percpu_buffer_size / 1024); + (int)(ftrace->percpu_buffer_size / 1024)); if (ret < 0) return ret; =20 @@ -691,7 +692,8 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace) break; =20 if (pollfd.revents & POLLIN) { - int n =3D read(trace_fd, buf, sizeof(buf)); + ssize_t n =3D read(trace_fd, buf, sizeof(buf)); + if (n < 0) break; if (fwrite(buf, n, 1, stdout) !=3D 1) @@ -713,7 +715,8 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace) =20 /* read remaining buffer contents */ while (true) { - int n =3D read(trace_fd, buf, sizeof(buf)); + ssize_t n =3D read(trace_fd, buf, sizeof(buf)); + if (n <=3D 0) break; if (fwrite(buf, n, 1, stdout) !=3D 1) @@ -1031,7 +1034,8 @@ static int __cmd_latency(struct perf_ftrace *ftrace) break; =20 if (pollfd.revents & POLLIN) { - int n =3D read(trace_fd, buf, sizeof(buf) - 1); + ssize_t n =3D read(trace_fd, buf, sizeof(buf) - 1); + if (n < 0) break; =20 @@ -1049,7 +1053,8 @@ static int __cmd_latency(struct perf_ftrace *ftrace) =20 /* read remaining buffer contents */ while (!ftrace->target.use_bpf) { - int n =3D read(trace_fd, buf, sizeof(buf) - 1); + ssize_t n =3D read(trace_fd, buf, sizeof(buf) - 1); + if (n <=3D 0) break; make_histogram(ftrace, buckets, buf, n, line); diff --git a/tools/perf/util/bpf_ftrace.c b/tools/perf/util/bpf_ftrace.c index 7324668cc83e..c4b3bb4e5922 100644 --- a/tools/perf/util/bpf_ftrace.c +++ b/tools/perf/util/bpf_ftrace.c @@ -97,7 +97,7 @@ int perf_ftrace__latency_prepare_bpf(struct perf_ftrace *= ftrace) false, func->name); if (IS_ERR(skel->links.func_begin)) { pr_err("Failed to attach fentry program\n"); - err =3D PTR_ERR(skel->links.func_begin); + err =3D (int)PTR_ERR(skel->links.func_begin); goto out; } =20 @@ -105,7 +105,7 @@ int perf_ftrace__latency_prepare_bpf(struct perf_ftrace= *ftrace) true, func->name); if (IS_ERR(skel->links.func_end)) { pr_err("Failed to attach fexit program\n"); - err =3D PTR_ERR(skel->links.func_end); + err =3D (int)PTR_ERR(skel->links.func_end); goto out; } =20 --=20 2.49.0.504.g3bcea36a83-goog