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Tue, 12 May 2026 10:59:33 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.87.85.9]) by smtpav04.fra02v.mail.ibm.com (Postfix) with ESMTP; Tue, 12 May 2026 10:59:33 +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 3/4] rust/bindgen_parameters: Mark s390 types as opaque to prevent repr conflicts Date: Tue, 12 May 2026 12:59:19 +0200 Message-ID: <20260512105920.2426293-4-japo@linux.ibm.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260512105920.2426293-1-japo@linux.ibm.com> References: <20260512105920.2426293-1-japo@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-s390@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-Authority-Analysis: v=2.4 cv=Y/XIdBeN c=1 sm=1 tr=0 ts=6a03081a cx=c_pps a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17 a=NGcC8JguVDcA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=U7nrCbtTmkRpXpFmAIza:22 a=VwQbUJbxAAAA:8 a=QyXUC8HyAAAA:8 a=VnNF1IyMAAAA:8 a=Ulcv6RcHQRQKaI22KjAA:9 X-Proofpoint-GUID: cQvzuh0RaOFnRv8kiQ_h-HjqcEM7g4zz X-Proofpoint-ORIG-GUID: u77MItQkDtBSHXEejGEAMwyaRXk1qvLj X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNTEyMDEwOSBTYWx0ZWRfX65uWPGxstxEq mm9oUlhTX7mpzUfYMOnUqfnNDD7RYtfDfW9+wIvfKcul9dSEmFeV4Sby8Kr/6rUrJQeWtPf6X5b ifvlfzFYnZrE7K4RlGcKJV71HjHZg9Bq7LjkohtuZl2G1BeIrlkOtFi0t+ytPHNvjHDFErVJrAL vcmdBJPbm5FdGsEwDnfrY9Q4odfPqtFXh4r4xXqhvhnfkrtXk7bgAzO+dQKpIsOcVQb38DsWZwo BfXbDuwzXDswNPH7il7pASIWOqJNrSVN90T4VqZ5ne7RngG6nlwqUgcZDpb7mDBpl7QipBJGqKM /+WFXkGWJSnel1SqPd8zm2MBOM+fUm7B+jHSK+tW7tEnAFHbZepD91csvlB5ikOoxRn0BtIStkF 4TB9yVIha4rj2+6/LC7Dz40ho6u0CvtLaBokYYVjk8n0LOZSt+/oWmTEKx6vWI7oFQdHpdErLFz AQ94WapzXQmX1KdV5fg== 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=2026-05-11_05,2026-05-08_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 priorityscore=1501 lowpriorityscore=0 phishscore=0 malwarescore=0 suspectscore=0 bulkscore=0 spamscore=0 adultscore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2605050000 definitions=main-2605120109 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/ 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