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Mon, 13 Oct 2025 03:57:27 +0000 (GMT) Content-Type: text/plain; charset=utf-8 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3774.600.62\)) Subject: Re: [linux-next20250912] Build warnings at drivers/net/ethernet/intel/idpf/xdp.c:6 From: Venkat In-Reply-To: <440ef1ad-6690-48e9-be02-1ccd69f6623e@intel.com> Date: Mon, 13 Oct 2025 09:27:14 +0530 Cc: Stephen Rothwell , Madhavan Srinivasan , michal.kubiak@intel.com, ramu.r@intel.com, anthony.l.nguyen@intel.com, LKML , linuxppc-dev , Linux Next Mailing List Content-Transfer-Encoding: quoted-printable Message-Id: <3BDEECFD-5267-4453-B45B-07D3A1545D75@linux.ibm.com> References: <22ac36cb-1ba5-429b-85e0-4e3f2da1f87f@linux.ibm.com> <440ef1ad-6690-48e9-be02-1ccd69f6623e@intel.com> To: Alexander Lobakin , Madhavan Srinivasan X-Mailer: Apple Mail (2.3774.600.62) X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=M5ZA6iws c=1 sm=1 tr=0 ts=68ec78ab cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=IkcTkHD0fZMA:10 a=x6icFKpwvdMA:10 a=QyXUC8HyAAAA:8 a=VnNF1IyMAAAA:8 a=4drnqeK61DyJAoi-yfcA:9 a=QEXdDO2ut3YA:10 a=cPQSjfK2_nFv0Q5t_7PE:22 X-Proofpoint-GUID: 1BeZCayoiwzxwpxlj-op3k4Zc5SRH0e7 X-Proofpoint-ORIG-GUID: 1BeZCayoiwzxwpxlj-op3k4Zc5SRH0e7 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMDEwMDE0MCBTYWx0ZWRfX22XyIiGd3ULE y+Oljm6tmKBkXehnxpiC6/IvFlhRjeCDgsVtQ+363MNprfMsnd54LG/npsg41MdmgKnJWmizHSp OznguIWUYBVNV3vYWTnG9k6YZBASq8Q0dWq0zuIwKkbGUTF7vX4H+EnHnoLf4jvqx7wnt0mWCGH 7X+ZUOa3JDaiWJaihy+9UP2jH+CbcUPmjvTkX61CkqwycJFcl8RhAi7sfTb2JJLSWfgvgkYNZp4 nRuGKy4UIAEqXxxVg71w/2+oh6azn0lg47q7kmmYZvonYXjqZkABtP7X5IYg9KNYjd6pr/QFAQy gSrLcEFdrumaRXzfihq2eypYnqshI8TlQ+Ts+E2sHRJwz94etghkTqXsq7UTYs0RFkjfv0ZIxqb 5nutZ2noKQjSQpMKPAOKC1/P9H6HIw== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1117,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-10-13_02,2025-10-06_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 bulkscore=0 spamscore=0 clxscore=1015 impostorscore=0 phishscore=0 adultscore=0 suspectscore=0 priorityscore=1501 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2510020000 definitions=main-2510100140 > On 12 Sep 2025, at 7:00=E2=80=AFPM, Alexander Lobakin = wrote: >=20 > From: Venkat Rao Bagalkote > Date: Fri, 12 Sep 2025 18:39:33 +0530 >=20 >> Greetings!!! >>=20 >>=20 >> IBM CI has reported a build warning on IBM Power Server, on linux- >> next20250912 kernel. >>=20 >>=20 >> gcc version 11.5.0 20240719 (Red Hat 11.5.0-2) (GCC) >>=20 >> GNU ld version 2.35.2-54.el9 >>=20 >>=20 >> Attached is the .config file. >>=20 >>=20 >> Warnings: >>=20 >> In file included from drivers/net/ethernet/intel/idpf/xdp.c:6: >> drivers/net/ethernet/intel/idpf/xdp.h: In function = =E2=80=98idpf_xdp_tx_xmit=E2=80=99: >> drivers/net/ethernet/intel/idpf/xdp.h:28:20: note: the ABI of passing >> aggregates with 16-byte alignment has changed in GCC 5 >> 28 | static inline void idpf_xdp_tx_xmit(struct libeth_xdp_tx_desc >> desc, u32 i, >> | ^~~~~~~~~~~~~~~~ >=20 > Yes, I do pass 16-byte variables/structures directly. >=20 > I would say this warning makes no sense, due to the following reasons: >=20 > 1. IIRC the minimum required GCC version for building the latest = kernel > is way above 5. > 2. This warning should appear only with `-Wabi`, which the upstream > kernel never sets. Now, this warning is seen on upstream kernel also.=20 Not sure if this is something we need to fix it or suppress the warning? Regards, Venkat. > 3. Kernel is a self-contained project, this function is not uAPI, so = we > shouldn't care in general about backward ABI compatibility for = purely > in-kernel stuff. >=20 > We have plenty of functions, mostly generic, which either passes or > returns >=3D 16-byte objects, but I see this warning for the first = time. > Despite that my repo is attached to the open Intel CI bots infra which > does daily builds on a good bunch of different architectures and > toolchains (inc. GCC 8+). >=20 >>=20 >>=20 >> Git bisect is pointing below commit as the first bad commit. >>=20 >>=20 >> first bad commit: [cba102cd719029a10bda1d0ca00ed646796f1f21] idpf: = add >> support for XDP on Rx >=20 > Thanks, > Olek