> On 12 Sep 2025, at 7:00 PM, Alexander Lobakin <[email protected]> > wrote: > > From: Venkat Rao Bagalkote <[email protected]> > Date: Fri, 12 Sep 2025 18:39:33 +0530 > >> Greetings!!! >> >> >> IBM CI has reported a build warning on IBM Power Server, on linux- >> next20250912 kernel. >> >> >> gcc version 11.5.0 20240719 (Red Hat 11.5.0-2) (GCC) >> >> GNU ld version 2.35.2-54.el9 >> >> >> Attached is the .config file. >> >> >> Warnings: >> >> In file included from drivers/net/ethernet/intel/idpf/xdp.c:6: >> drivers/net/ethernet/intel/idpf/xdp.h: In function ‘idpf_xdp_tx_xmit’: >> 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, >> | ^~~~~~~~~~~~~~~~ > > Yes, I do pass 16-byte variables/structures directly. > > I would say this warning makes no sense, due to the following reasons: > > 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. 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. > > We have plenty of functions, mostly generic, which either passes or > returns >= 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+). > >> >> >> Git bisect is pointing below commit as the first bad commit. >> >> >> first bad commit: [cba102cd719029a10bda1d0ca00ed646796f1f21] idpf: add >> support for XDP on Rx > > Thanks, > Olek
