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Mon, 21 Sep 2026 15:58:06 +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 15:58:06 +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 v4 02/11] s390/percpu: Add sanity check to GEN_MVIY macro Date: Mon, 21 Sep 2026 17:57:56 +0200 Message-ID: <20260921155806.2447506-3-hca@linux.ibm.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260921155806.2447506-1-hca@linux.ibm.com> References: <20260921155806.2447506-1-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-Authority-Analysis: v=2.4 cv=V/XoQuni c=1 sm=1 tr=0 ts=6ab15413 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: OSMPmh4CRiuqyRMx-JXlDF0sbNQL_bf0 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTIxMDIyNyBTYWx0ZWRfX933hFn+mm+hD B9QxP3S0tWDH5J3KZ55RZHHu/sFrMxb6MP1/dGuDQqhzoPUjAll+w68I43B/m7c3/5C7ExzS9W8 TQSz4oADGseEoGKQiMr/+BEYo5k4Fwf/yRY2RvBQsMy0kp1AnweBIvxJtM5BaBR6kyjf/eG1VpW ZNuAkAgn3URbhLFwDiHZaejq6Ag1v1K9Z8JjYFZrs0KMVp2/0YLoLB5ieEIHTmeIgpC2QfPtEdz FCGRylCKiqYdw6jNwbg9xLd4C+ViNrDGzHp7f063zgoZ3EMR1DEaQ5qDW9YFeGUzuh5s7c0EMJ6 p8jFwz+/ucFJEnP+8TnJdSxEejQaBm62Y3WpGV2RGSzO1bZPuhqdXHIxfW160DE31kuh/dPQjS+ LFIkYKlyMYe0xTHu9IwvXAEo1RgL92BGbuKfqBGREldGr07rsPcP6tzFn+7mJk4q9f7PL59v5i/ ArXpunjdSpcz4hUqGKQ== X-Proofpoint-Spam-Info: AW1haW4tMjYwOTIxMDIyNyBTYWx0ZWRfX44angYovkGQ0 uzvU5JijCvt6G0YZic9GqW/GuDMg8GhNWb07qANYEsvV7KCzqwUGFo5KUVwNV/BsH1OZCWIqiiM XKVm+2VgsSjMeFVP/REzXmh0dOxxcEw= X-Proofpoint-GUID: OSMPmh4CRiuqyRMx-JXlDF0sbNQL_bf0 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_05,2026-09-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 spamscore=0 malwarescore=0 clxscore=1015 phishscore=0 bulkscore=0 adultscore=0 lowpriorityscore=0 impostorscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2609210227 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