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Fri, 18 Sep 2026 08:48:42 +0000 (GMT) Received: from tuxmaker.lnxne.boe (unknown [9.87.85.9]) by smtpav01.fra02v.mail.ibm.com (Postfix) with ESMTP; Fri, 18 Sep 2026 08:48:42 +0000 (GMT) From: Heiko Carstens To: Alexander Gordeev , Sven Schnelle , Vasily Gorbik , Christian Borntraeger , Mete Durlu , Peter Zijlstra , Mark Rutland , Juergen Christ , Ilya Leoshkevich Cc: linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org Subject: [PATCH v2 02/12] s390/percpu: Add sanity check to GEN_MVIY macro Date: Fri, 18 Sep 2026 10:48:32 +0200 Message-ID: <20260918084842.2333237-3-hca@linux.ibm.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260918084842.2333237-1-hca@linux.ibm.com> References: <20260918084842.2333237-1-hca@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-GUID: A8EjY1xm5ZSEqzxZhnI2W4_QAmQGD98A X-Proofpoint-Spam-Info: AW1haW4tMjYwOTE4MDExNyBTYWx0ZWRfXxD9Ug3Pa3pCN rklIjNRZ2PxdZtCNhXAnWb7LsBQTWNyuhnyPl2q7k527l5gDswzPGqgTnteTiIwDIWyvHEr+WsE DaCEbloRXY4DQak84Q6/bPvxmjsoeg0= X-Authority-Analysis: v=2.4 cv=cvgOAF4i c=1 sm=1 tr=0 ts=6aacfaef cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=VdqzKS8jKosA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=U7nrCbtTmkRpXpFmAIza:22 a=VnNF1IyMAAAA:8 a=nXcjTbxpPpxkwf3kCnwA:9 X-Proofpoint-ORIG-GUID: A8EjY1xm5ZSEqzxZhnI2W4_QAmQGD98A X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTE4MDExNyBTYWx0ZWRfXzhwqCkAH8ZvL IwRE9VM5MBHrHyY46AKd+PQGfw11rROLwhyOfFMevUjltT975U3/mPB8+5m0Chjmo2JJsv++aNS OEthF80wKRXnZiQp2Lbf7L+4JOr6wkkYVbWb8powOhby+uXQiccIV2disZ3AMMgrQblY8ittMQV JuqTX+HFN8GDDwLExVkMoaAzPUEoCmnN/NhShsaqDs8LDvGZpJdTzQaaRVrcswS59iJlJq9O30M 0VBxt2tk9Dlu9Rj9PzX70h7bDFVEM76ES8KpHklRLhg2Srp8WtLsnSeAlTwyyrMqmtHQzwzrjQz /KxxjjZP6jOK7W++bxeqUPfcWaCDsOjSfb5dSVQ4IlC/1ijla8mHKckEicM1XufBJR5sGW7WJob +bIfFaQcAK87FxivP2zPqiWS4g0qE0IqqcST7QrkN0rYLEUM1fdRvEc7bdftsmfbb6aVJOrT5QG A3Z2IdDN1ko40wbZbQg== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-09-18_02,2026-09-16_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 lowpriorityscore=0 clxscore=1015 priorityscore=1501 suspectscore=0 bulkscore=0 impostorscore=0 phishscore=0 spamscore=0 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2609180117 Emit an error if the GEN_MVIY macro fails to parse the passed register string. This will make it more obvious if something similar which was fixed with [1] happens again. [1] commit 101782f8945a ("s390/percpu: Fix MVIY_PERCPU() with older binutils") Signed-off-by: Heiko Carstens --- arch/s390/include/asm/percpu.h | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/arch/s390/include/asm/percpu.h b/arch/s390/include/asm/percpu.h index 31012abe8292..9888b38dedab 100644 --- a/arch/s390/include/asm/percpu.h +++ b/arch/s390/include/asm/percpu.h @@ -100,12 +100,17 @@ */ #define MVIY_PERCPU(disp, dispalt, reg) \ - ".macro GEN_MVIY disp reg\n" \ + ".macro GEN_MVIY disp, reg\n" \ + ".set .Lreg,255\n" \ ".irp rs,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15\n" \ " .ifc \\reg,%%r\\rs\n" \ - " mviy \\disp(%%r0),\\rs\n" \ + " .set .Lreg,\\rs\n" \ " .endif\n" \ ".endr\n" \ + ".if .Lreg == 255\n" \ + " .error \"Illegal register number\"\n" \ + ".endif\n" \ + "mviy \\disp(%%r0),.Lreg\n" \ ".endm\n" \ ALTERNATIVE("GEN_MVIY " disp ", " reg "\n", \ "GEN_MVIY " dispalt ", " reg "\n", \ -- 2.53.0