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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. 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