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Sun, 6 Apr 2025 16:34:29 GMT Received: from smtprelay06.fra02v.mail.ibm.com ([9.218.2.230]) by ppma21.wdc07v.mail.ibm.com (PPS) with ESMTPS id 45ufuna99p-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sun, 06 Apr 2025 16:34:29 +0000 Received: from smtpav06.fra02v.mail.ibm.com (smtpav06.fra02v.mail.ibm.com [10.20.54.105]) by smtprelay06.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 536GYPx626870332 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Sun, 6 Apr 2025 16:34:25 GMT Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 9949020049; Sun, 6 Apr 2025 16:34:25 +0000 (GMT) Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 848D620040; Sun, 6 Apr 2025 16:34:21 +0000 (GMT) Received: from li-e616facc-2daa-11b2-a85c-9c7f23c3cd5e.ibm.com.com (unknown [9.39.20.57]) by smtpav06.fra02v.mail.ibm.com (Postfix) with ESMTP; Sun, 6 Apr 2025 16:34:21 +0000 (GMT) From: Likhitha Korrapati To: acme@kernel.org, jolsa@kernel.org, adrian.hunter@intel.com, irogers@google.com, namhyung@kernel.org Cc: linux-perf-users@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, maddy@linux.ibm.com, atrajeev@linux.ibm.com, Likhitha Korrapati Subject: [PATCH] tools/lib/perf: Fix -Werror=alloc-size-larger-than in cpumap.c Date: Sun, 6 Apr 2025 22:04:12 +0530 Message-ID: <20250406163412.897313-1-likhitha@linux.ibm.com> X-Mailer: git-send-email 2.43.5 X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: uXAkx6ONmm2gNLmbAIULtmQvm6muFQqQ X-Proofpoint-GUID: 7lxIQj-qXevGsWmFquYBXpGJi-Qsw3li X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1095,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-04-06_04,2025-04-03_03,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 impostorscore=0 suspectscore=0 lowpriorityscore=0 spamscore=0 mlxlogscore=999 clxscore=1015 phishscore=0 adultscore=0 priorityscore=1501 mlxscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2502280000 definitions=main-2504060119 perf build break observed when using gcc 13-3 (FC39 ppc64le) with the following error. cpumap.c: In function 'perf_cpu_map__merge': cpumap.c:414:20: error: argument 1 range [18446744069414584320, 18446744073709551614] exceeds maximum object size 9223372036854775807 [-Werror=alloc-size-larger-than=] 414 | tmp_cpus = malloc(tmp_len * sizeof(struct perf_cpu)); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ In file included from cpumap.c:4: /usr/include/stdlib.h:672:14: note: in a call to allocation function 'malloc' declared here 672 | extern void *malloc (size_t __size) __THROW __attribute_malloc__ | ^~~~~~ cc1: all warnings being treated as errors Error happens to be only in gcc13-3 and not in latest gcc 14. Even though git-bisect pointed bad commit as: 'commit f5b07010c13c ("libperf: Don't remove -g when EXTRA_CFLAGS are used")', issue is with tmp_len being "int". It holds number of cpus and making it "unsigned int" fixes the issues. After the fix: CC util/pmu-flex.o CC util/expr-flex.o LD util/perf-util-in.o LD perf-util-in.o AR libperf-util.a LINK perf GEN python/perf.cpython-312-powerpc64le-linux-gnu.so Signed-off-by: Likhitha Korrapati --- tools/lib/perf/cpumap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/lib/perf/cpumap.c b/tools/lib/perf/cpumap.c index 4454a5987570..c7c784e18225 100644 --- a/tools/lib/perf/cpumap.c +++ b/tools/lib/perf/cpumap.c @@ -398,7 +398,7 @@ bool perf_cpu_map__is_subset(const struct perf_cpu_map *a, const struct perf_cpu int perf_cpu_map__merge(struct perf_cpu_map **orig, struct perf_cpu_map *other) { struct perf_cpu *tmp_cpus; - int tmp_len; + unsigned int tmp_len; int i, j, k; struct perf_cpu_map *merged; -- 2.43.5