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Thu, 17 Sep 2026 19:22:37 +0000 (GMT) Received: from tuxmaker.lnxne.boe (unknown [9.87.85.9]) by smtpav06.fra02v.mail.ibm.com (Postfix) with ESMTP; Thu, 17 Sep 2026 19:22:37 +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 02/12] s390/percpu: Add sanity check to GEN_MVIY macro Date: Thu, 17 Sep 2026 21:22:27 +0200 Message-ID: <20260917192237.638324-3-hca@linux.ibm.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260917192237.638324-1-hca@linux.ibm.com> References: <20260917192237.638324-1-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-Spam-Details-Enc: AW1haW4tMjYwOTE3MDI3MiBTYWx0ZWRfX26T6KMKwu6YL 5fXnHdzjJ0WgRn6KaFijtfR+p5zN5rhn430UlQvz/Qifs/4DCMYbktcyjthbheDjh1Bv7i1LUtG TFzDi+PHV5J7iVyUbZ2q0/qVVACLPeb/qJuLQL+zpiMdGZIWsLq0ps+/Fteq1ED0yUMb8fynz3c wp7UCewSBrzTfM4BD0fO2BUKka+LIXmdQ0Q6NHkmj7wE7GgPojXWGj/wrmUEhQzPtDg0mc/y4Es Ofh4krSsfxUItt4Kh3B2G6htTpYTmJZObEB/ULGKXkjybNSg3oP3g4GM/cVhFY0R6BwfuvvolKy 5/KiMEc1REnX2BFzD2TVfuMOLUXrKtOz/G7zFzfdnWlQmfp+oYwtBAogWYV/65pevTuMVi+j2vl CX8gnXeVECs1rrKNdCsE3EPJVcKKvhB8NOqx2vZ0k+kSb6Hsd/FW/eM8cadm52F0+n6OIJdjmHC YAPvm2/MqsrvxznnIlA== X-Proofpoint-Spam-Info: AW1haW4tMjYwOTE3MDI3MiBTYWx0ZWRfXwMoLUJW+lmrT UUce9n83t18SokdJfHJ84PBly41zs/zo0PqRM9nbCSziDtY6D/Y98k3xAcbo3kNiCq7zb+g6hQi C1VjTiBddsUsmuhO0yne95Dtdn0W1MU= X-Authority-Analysis: v=2.4 cv=Zsx4uN7G c=1 sm=1 tr=0 ts=6aac3e02 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=VdqzKS8jKosA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=Y2IxJ9c9Rs8Kov3niI8_:22 a=VnNF1IyMAAAA:8 a=nXcjTbxpPpxkwf3kCnwA:9 X-Proofpoint-ORIG-GUID: 9NjdtlrRKsI0NpMQl5AY0ChWIuKUP-Yo X-Proofpoint-GUID: 9NjdtlrRKsI0NpMQl5AY0ChWIuKUP-Yo 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=2026-09-17_04,2026-09-16_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 impostorscore=0 clxscore=1015 priorityscore=1501 lowpriorityscore=0 bulkscore=0 adultscore=0 phishscore=0 spamscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2609170272 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