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Mon, 21 Sep 2026 08:40:06 +0000 (GMT) Received: from tuxmaker.lnxne.boe (unknown [9.87.85.9]) by smtpav01.fra02v.mail.ibm.com (Postfix) with ESMTP; Mon, 21 Sep 2026 08:40:06 +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 v3 02/11] s390/percpu: Add sanity check to GEN_MVIY macro Date: Mon, 21 Sep 2026 10:39:56 +0200 Message-ID: <20260921084005.4022574-3-hca@linux.ibm.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260921084005.4022574-1-hca@linux.ibm.com> References: <20260921084005.4022574-1-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-ORIG-GUID: jHUpfP3y5Ju39wzYsJBvmOsJREMoZ5Lu X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTIxMDEyMyBTYWx0ZWRfX5/AJfLcDuDVj RTQe5qQp0uU0VOMXgfogAsHCNX0xkYEAyP9248YZcPkajVFDulQ9ele6GmxjcvVfiH03XEs3hip qLwapTLrejra+0oOR0I2VZossbLLkhFHrJzgdt1r0aw1mVTpPc/+4guDxfCnZ/y737k3joGKmRJ oq/WhIaNIaa2YGsVfWmZF1WT6Yh9HioojvaMX+7+HkxMuls6X3p1lo8D7OsccMf65oqDGCkOAGJ V56JazfoxpYfwSXIdjZWD3Y4BWwfwqvbgNsd/Jog6bdSGGpa28CJVCHrnAAoK20JTUOd0reKX1f Ex3hl8l1lmZM3POjfGBSby3Ws0SlqmDS0K7QOz5Z5BFvObSirO9kKHlKOIUwcVBwLmpKHh2D8u9 wm9cYUkk4YeMHuYKJoYL/e07ZfpyRFMgsRVlSKUNDLos6k5Ocb6PpKSm7eFyjJnzx9jOkivw+sj WJ90RBRScFsH8ftX/mQ== X-Authority-Analysis: v=2.4 cv=O/KsLx9W c=1 sm=1 tr=0 ts=6ab0ed6b cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=VdqzKS8jKosA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=Y2IxJ9c9Rs8Kov3niI8_:22 a=VnNF1IyMAAAA:8 a=nXcjTbxpPpxkwf3kCnwA:9 X-Proofpoint-Spam-Info: AW1haW4tMjYwOTIxMDEyMyBTYWx0ZWRfXxqiImRLiIjx1 QKOlmj9Ct2wPE5I48by1rko9UMhcMCENotOLYxuqrcs4pP/QyK0nZiuAdE0whRtwrct/BzzS+we L2d57Ps1xg1san+yDWnIl+XjBdYjG0k= X-Proofpoint-GUID: jHUpfP3y5Ju39wzYsJBvmOsJREMoZ5Lu 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=2026-09-21_03,2026-09-16_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 malwarescore=0 phishscore=0 impostorscore=0 suspectscore=0 bulkscore=0 priorityscore=1501 lowpriorityscore=0 adultscore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2609210123 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