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Fri, 29 May 2026 14:57:55 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.87.85.9]) by smtpav03.fra02v.mail.ibm.com (Postfix) with ESMTP; Fri, 29 May 2026 14:57:55 +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 v4 4/6] rust: helpers: Use __builtin_memchr directly on s390 Date: Fri, 29 May 2026 16:57:50 +0200 Message-ID: <20260529145752.1209016-5-japo@linux.ibm.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260529145752.1209016-1-japo@linux.ibm.com> References: <20260529145752.1209016-1-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-Proofpoint-GUID: vV_9jLwsdk_Yi6R_FsAr5d08pjEHK2l3 X-Authority-Analysis: v=2.4 cv=Z8Dc2nRA c=1 sm=1 tr=0 ts=6a19a979 cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=NGcC8JguVDcA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=U7nrCbtTmkRpXpFmAIza:22 a=pGLkceISAAAA:8 a=VnNF1IyMAAAA:8 a=IDKdOGsrxnk7c9Cu3JMA:9 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNTI5MDE0NiBTYWx0ZWRfX6/uoqH9kLBPN F24UiH0lwfmVDTGHpoxjSBNEjDXVhwpxTENliL7UbyoKkuOFnaV7G6E4BjdZ6Q0oa0zs3N7S87B MQWqJm3fGFa6qNu7gSTTx88v0gwXIii0foLYKxhm/zLer9pKDSUNMqk+Ym1/KkyOr30aJmRRXxl /NxcKkecBwuGWe/rBh0l+2Tt1zbz67EDh2mcCLdZ5UsT7puaz+i7Jhm0jRFRgGjSlbLxn2YybIk 4h9hqU1R569RhdOVVqr/FhwgjlI4NyLFEWevhoYtGkefy/LMO99yhfJF0byaTuDUsTowSzQp3Qu LZ2VXNCvZRoKc2E/5nshiiPi8dg/OI/Doii3/fBS+fBQNdcX3bhJ5vq9JVkHJraq2KDnX7puvHr JXynzrdXCUljpfKvesNjgLe9ZHVaFmFRiDZbC1335NhNAAYetoex4cKaW9LK6dU0oYcKuMKtsJx OjxoJuwAI/bX8GUof4Q== X-Proofpoint-ORIG-GUID: Bm-_96bkl9LvOTzOMAlamic2RTseClsJ X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.125,FMLib:17.12.100.49 definitions=2026-05-29_04,2026-05-28_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 spamscore=0 bulkscore=0 impostorscore=0 priorityscore=1501 malwarescore=0 phishscore=0 suspectscore=0 adultscore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2605210000 definitions=main-2605290146 The __underlying_memchr macro from include/linux/fortify-string.h is not being expanded correctly during Rust helpers compilation on s390x architecture, causing a build failure: rust/helpers/uaccess.c:40:16: error: implicit declaration of function '__underlying_memchr' The macro is defined as __builtin_memchr, so use the builtin directly instead of relying on the macro expansion. Reported-by: Miguel Ojeda Signed-off-by: Jan Polensky --- rust/helpers/uaccess.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/rust/helpers/uaccess.c b/rust/helpers/uaccess.c index d9625b9ee046..d4107426003e 100644 --- a/rust/helpers/uaccess.c +++ b/rust/helpers/uaccess.c @@ -1,6 +1,7 @@ // SPDX-License-Identifier: GPL-2.0 #include +#include __rust_helper unsigned long rust_helper_copy_from_user(void *to, const void __user *from, unsigned long n) @@ -27,3 +28,9 @@ unsigned long rust_helper__copy_to_user(void __user *to, const void *from, unsig return _inline_copy_to_user(to, from, n); } #endif + +__rust_helper +void *rust_helper_memchr(const void *s, int c, size_t n) +{ + return __builtin_memchr(s, c, n); +} -- 2.53.0