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Wed, 8 Apr 2026 04:28:18 +0000 (GMT) From: Madhavan Srinivasan To: linuxppc-dev@lists.ozlabs.org, Amit Machhiwal Cc: Vaibhav Jain , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Shuah Khan , Greg Kurz , linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: Re: [PATCH v2] selftests/powerpc: Suppress -Wmaybe-uninitialized with GCC 15 Date: Wed, 8 Apr 2026 09:58:17 +0530 Message-ID: <177562236422.1381144.4554144401168873566.b4-ty@linux.ibm.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260313165426.43259-1-amachhiw@linux.ibm.com> References: <20260313165426.43259-1-amachhiw@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-ORIG-GUID: G-qH3MqtFyaihStNPY5YFbbVWzyxAClT X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDA4MDAzNiBTYWx0ZWRfX/BAOe+ncuKhk DugWvbEG0AMFDuxIE48S2IaYs1d6WNMyHuFZVxQcT+ox6MIK/9i+frIydzQFZWRXJjPQwQRA1st L7tkGrEuUjDA/qTVR3hlFa3y9D5GUqGZsNNRHnUIduUshxaTGQerEASguBvGK3KiLbDmk6dPFI1 hXVb8wgbnXLYA1gBECw5diBdbfXetpGKVyRoLXpIR+DkuV6DvU6hRIsup02on1lm0Ff5NvzjE+V fg+xlLhKQwJaq7S8ffr5FI6Cv64LD6hHeiglFbSN62ZzaXrtwn1T1ezBBph/P+AK3+TQ4FnIx95 cYbDOQE/mfAa+XMC7stC2cV3ySPI2LKSjTebVlYDZD9edIrbgJre73nd4bDvSxZfvccB2GUr4Hw hcEubB2rSK6U2Ui8XWm7zneGX6zSF1eS/RL1sFRP2e4n9dp111X6WTSdsvD+Z4ytxUjPalwzxW/ eY+IXgVg6+Cc9J/nvJg== X-Authority-Analysis: v=2.4 cv=Cfw4Irrl c=1 sm=1 tr=0 ts=69d5d96a cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=IkcTkHD0fZMA:10 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=iQ6ETzBq9ecOQQE5vZCe:22 a=VwQbUJbxAAAA:8 a=oeOQCyp_1XCr1dGvqAMA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 X-Proofpoint-GUID: ez6dFC_gI3skCz9XJG-SPahKkdPdSBmn X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-04-08_02,2026-04-07_05,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 phishscore=0 clxscore=1011 adultscore=0 suspectscore=0 priorityscore=1501 impostorscore=0 bulkscore=0 spamscore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604010000 definitions=main-2604080036 On Fri, 13 Mar 2026 22:24:26 +0530, Amit Machhiwal wrote: > GCC 15 reports the below false positive '-Wmaybe-uninitialized' warning > in vphn_unpack_associativity() when building the powerpc selftests. > > # make -C tools/testing/selftests TARGETS="powerpc" > [...] > CC test-vphn > In file included from test-vphn.c:3: > In function ‘vphn_unpack_associativity’, > inlined from ‘test_one’ at test-vphn.c:371:2, > inlined from ‘test_vphn’ at test-vphn.c:399:9: > test-vphn.c:10:33: error: ‘be_packed’ may be used uninitialized [-Werror=maybe-uninitialized] > 10 | #define be16_to_cpup(x) bswap_16(*x) > | ^~~~~~~~ > vphn.c:42:27: note: in expansion of macro ‘be16_to_cpup’ > 42 | u16 new = be16_to_cpup(field++); > | ^~~~~~~~~~~~ > In file included from test-vphn.c:19: > vphn.c: In function ‘test_vphn’: > vphn.c:27:16: note: ‘be_packed’ declared here > 27 | __be64 be_packed[VPHN_REGISTER_COUNT]; > | ^~~~~~~~~ > cc1: all warnings being treated as errors > > [...] Applied to powerpc/next. [1/1] selftests/powerpc: Suppress -Wmaybe-uninitialized with GCC 15 https://git.kernel.org/powerpc/c/6e65886fceb23605eff952d6b1975737b4c4b154 cheers