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Wed, 15 Nov 2023 20:34:39 +0000 (GMT) From: Ilya Leoshkevich To: Alexander Gordeev , Alexander Potapenko , Andrew Morton , Christoph Lameter , David Rientjes , Joonsoo Kim , Marco Elver , Masami Hiramatsu , Pekka Enberg , Steven Rostedt , Vasily Gorbik , Vlastimil Babka Cc: Christian Borntraeger , Dmitry Vyukov , Hyeonggon Yoo <42.hyeyoo@gmail.com>, kasan-dev@googlegroups.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-s390@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Mark Rutland , Roman Gushchin , Sven Schnelle , Ilya Leoshkevich Subject: [PATCH 19/32] kmsan: Accept ranges starting with 0 on s390 Date: Wed, 15 Nov 2023 21:30:51 +0100 Message-ID: <20231115203401.2495875-20-iii@linux.ibm.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20231115203401.2495875-1-iii@linux.ibm.com> References: <20231115203401.2495875-1-iii@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: NqSGEOhYCvXYjJ2gmAhd8EZAV9lDeRqN X-Proofpoint-GUID: fI9InjhahjWpUFvyF7-N6n0DC7cim79b X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.987,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-11-15_20,2023-11-15_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 malwarescore=0 mlxscore=0 clxscore=1015 adultscore=0 spamscore=0 lowpriorityscore=0 bulkscore=0 priorityscore=1501 phishscore=0 mlxlogscore=981 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311060000 definitions=main-2311150163 X-Stat-Signature: hrd6c6m78e41in4row6cbsfnqzbw9z3z X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 5469418000E X-Rspam-User: X-HE-Tag: 1700080491-619394 X-HE-Meta: U2FsdGVkX1/32i1sfXTBZJIAo02BfT2nGDpXkLr4lzcdxjH/4FBuJNQzDHC3iNmj54AGoi38vvVeK+YAg9mVnemyXshcy6hHBCjhJ8GtJI/syAQzK2iqPQDwLAi91Wa1RFCkztvaqJkGfVk5opQmIYGxeugSckt0aV5dQdjPCVMYt1O6zw305sSALnFUwI7kVtvfcJCgOd+dW8n1tYXcWvtWX4Wjr4Fp6vZiqg9q1Yhf0yMvAG1WVA969K+Srm73T4uo1DP4HeemQLV9PAtnyxf8TiIkvWDd8dNpES0EBZCT8BBrWXQ8nH6KRxPxObS1fYCOnZ4ZPGYIJrO3Sw2nw55SuNsZZG7HWs34FZyBYu/uZlkWbCDdPuQTc2X3Ry5sdti2gQDiMP116xQsxqWsFxJPMDfXfXxs05zwSs2BTq4r5Djr0vnQpgklEO6fr7CaC/cQuA6elnkIFdAZdgVVAX2ewmksLKtixVBlpZrRFT+yMyuCEO5dHYh4zEfYs2BlBsjVMs8IyYYjW+Qkq5khPUDxRw8ZZ5bSr6XA+9Ap1LNOp7QrFvKz4vzEkHtKQpuknd+i3zuNC025Jkm0MjrQSEWXUPtKceuMIoVNczvzpYObHYI1a+dEbGo2MjvhBHR/9Klx2DSeqFVLpZhFPR0nlc82ZaWAzufkTwE3zE1zOBK+ESFLmElEdxN51YXsIFuqBl1zGoTy5bZdQIhthxPrKnshmxwM3Mj73TzbUoFioh3lj9v3QpFheqJWTie1WUugB/Qo/aKw8oHdNTE4w4kJxMTwQSLcv6HXJdZA0oThjEFXP9m9CJDa6Mp7WySWTbEYBdhYyShDhrFlZV2pcGZMmPUNRwp+cxfoUF/oZ7mqwa9NhE6aWGwpm2w12mAn4SwL1U87Sv+uw3VM6lwXxp8gTa9tzbcrcg9vdFzTSokF/XXVV01pS+vooPh/wOXhG4TRShJWOMxDg1g8O68SOXY 0A7Sjruk nwWS75tyOPlbj28H+y6cvE1k4pEc9BkotKdEi9Vdb5d2cvTX0ZT2ERpPM9YSijjygfJWsePiIr/GKexJ5Xq7lFtAPJ4glcUgRYQE+h68yWluaAVrZpbF3cngwAGlGADFU/+Hz+GOcy2RK8u2nFvxUM49H3NTCdJoPsARSQq4y7kUwqfi91dSRmBAMWmzdj+Bl37Mc3G2BU3xPebhhg2lEzcCrRg== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On s390 the virtual address 0 is valid (current CPU's lowcore is mapped there), therefore KMSAN should not complain about it. Disable the respective check on s390. There doesn't seem to be a Kconfig option to describe this situation, so explicitly check for s390. Signed-off-by: Ilya Leoshkevich Reviewed-by: Alexander Potapenko --- mm/kmsan/init.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/mm/kmsan/init.c b/mm/kmsan/init.c index ffedf4dbc49d..14f4a432fddd 100644 --- a/mm/kmsan/init.c +++ b/mm/kmsan/init.c @@ -33,7 +33,9 @@ static void __init kmsan_record_future_shadow_range(void *start, void *end) bool merged = false; KMSAN_WARN_ON(future_index == NUM_FUTURE_RANGES); - KMSAN_WARN_ON((nstart >= nend) || !nstart || !nend); + KMSAN_WARN_ON((nstart >= nend) || + (!IS_ENABLED(CONFIG_S390) && !nstart) || + !nend); nstart = ALIGN_DOWN(nstart, PAGE_SIZE); nend = ALIGN(nend, PAGE_SIZE);