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Tue, 19 May 2026 15:12:29 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.87.85.9]) by smtpav01.fra02v.mail.ibm.com (Postfix) with ESMTP; Tue, 19 May 2026 15:12:29 +0000 (GMT) From: Jan Polensky To: hca@linux.ibm.com, gor@linux.ibm.com, agordeev@linux.ibm.com, ojeda@kernel.org, peterz@infradead.org, jpoimboe@kernel.org, jbaron@akamai.com, aliceryhl@google.com Cc: borntraeger@linux.ibm.com, svens@linux.ibm.com, boqun@kernel.org, gary@garyguo.net, bjorn3_gh@protonmail.com, lossin@kernel.org, a.hindborg@kernel.org, tmgross@umich.edu, dakr@kernel.org, rostedt@goodmis.org, ardb@kernel.org, linux-s390@vger.kernel.org, rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 3/4] rust/bindgen_parameters: Mark s390 types as opaque to prevent repr conflicts Date: Tue, 19 May 2026 17:12:13 +0200 Message-ID: <20260519151215.1611802-4-japo@linux.ibm.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260519151215.1611802-1-japo@linux.ibm.com> References: <20260519151215.1611802-1-japo@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNTE5MDE1MCBTYWx0ZWRfXytWYfVrkCnry xivG86VmcVyUvkVrPqaLgHP/XU/gsCNlxcU6Va3C2pibonKZBUq0ZRW3RHs9pie5jwsSJuTeAQr WB8t7aL6SPfO0V2sfVrueMVhDTnpOTN8eWC1JEfLL3PYz2TOSeuOXMMxPdVJCX5yIQ2fsQ/Kyat jCSiVQS4cOar7ZkogheMAM4HvAgYbZJhzJCz4ldUevgKJ3SLIRsNMzMjP3DY2jz/wbYROO9lbFI nl+YYB5KHPQh4L+BpTLtn2U8gnEQi7wMN1KgXP9aWNPGYkTqInzIf+bwGpKiH9Vh5pIf9cdjP1S /sl7kb8d94748oum6WF0y/NrvkKTq+zGmvCqEbLFHSrBFOJXCv7iR/HnZo8miLs+jC2XwGPvZ24 2SQabmSpgUZK4HkORsKHgPP6UW4owio9gG3qedrc/szv28zCqkkItZCbmhRplHtNgLYoBTR7HPd iqWrZqK2d0axs7qqavg== X-Authority-Analysis: v=2.4 cv=Np/htcdJ c=1 sm=1 tr=0 ts=6a0c7de3 cx=c_pps a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17 a=NGcC8JguVDcA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=RzCfie-kr_QcCd8fBx8p:22 a=VwQbUJbxAAAA:8 a=QyXUC8HyAAAA:8 a=_2yia0w1AAAA:8 a=VnNF1IyMAAAA:8 a=Ulcv6RcHQRQKaI22KjAA:9 a=4yAS8WwzZ1jAEY03B-5r:22 X-Proofpoint-ORIG-GUID: AHXIwi_-ZpLBP3JAYv8kVvFojGM_EUm- X-Proofpoint-GUID: ZMJ5eqwORWFam1IMHE40mf1ajHp3G113 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=2026-05-19_04,2026-05-18_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 spamscore=0 clxscore=1015 priorityscore=1501 impostorscore=0 lowpriorityscore=0 suspectscore=0 adultscore=0 phishscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2605130000 definitions=main-2605190150 Bindgen attempts to generate Rust layouts for a number of s390 structs that are packed but contain, or transitively contain, aligned fields. Rust rejects such layouts with E0588 ("packed type cannot transitively contain a #[repr(align)] type"). Add the affected s390 types to the opaque type list so bindgen emits opaque blob types instead of full representations. This matches existing workarounds for x86 types such as alt_instr and x86_msi_data. References: https://lore.kernel.org/all/e5c7aa10-590d-0d20-dd3b-385bee2377e7@intel.com/ Reviewed-by: Gary Guo Signed-off-by: Jan Polensky --- rust/bindgen_parameters | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/rust/bindgen_parameters b/rust/bindgen_parameters index 6f02d9720ad2..8402b0c93545 100644 --- a/rust/bindgen_parameters +++ b/rust/bindgen_parameters @@ -14,6 +14,13 @@ --opaque-type alt_instr --opaque-type x86_msi_data --opaque-type x86_msi_addr_lo +# s390-only: same packed/align issue as above (E0588). +--opaque-type lowcore +--opaque-type tod_clock +--opaque-type tpi_info +--opaque-type uv_cb.* +--opaque-type uv_secret.* +--opaque-type zpci_fib # If SMP is disabled, `arch_spinlock_t` is defined as a ZST which triggers a Rust # warning. We don't need to peek into it anyway. -- 2.51.0