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Wed, 13 Dec 2023 23:36:38 GMT Received: from smtpav02.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id E859120040; Wed, 13 Dec 2023 23:36:37 +0000 (GMT) Received: from smtpav02.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 7C47620043; Wed, 13 Dec 2023 23:36:36 +0000 (GMT) Received: from heavy.boeblingen.de.ibm.com (unknown [9.171.70.156]) by smtpav02.fra02v.mail.ibm.com (Postfix) with ESMTP; Wed, 13 Dec 2023 23:36:36 +0000 (GMT) From: Ilya Leoshkevich To: Alexander Gordeev , Alexander Potapenko , Andrew Morton , Christoph Lameter , David Rientjes , Heiko Carstens , 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 v3 18/34] kmsan: Accept ranges starting with 0 on s390 Date: Thu, 14 Dec 2023 00:24:38 +0100 Message-ID: <20231213233605.661251-19-iii@linux.ibm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20231213233605.661251-1-iii@linux.ibm.com> References: <20231213233605.661251-1-iii@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: cPCpBguRX25yk0cY5HbnO3wP8bPYoaUi X-Proofpoint-GUID: tWEK5BHWwLFqmCkK5VSnrvyWkz9szQAT X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.997,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-12-13_14,2023-12-13_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 impostorscore=0 priorityscore=1501 suspectscore=0 spamscore=0 phishscore=0 bulkscore=0 lowpriorityscore=0 mlxscore=0 mlxlogscore=993 adultscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311290000 definitions=main-2312130167 X-Rspamd-Queue-Id: B5512C0020 X-Rspam-User: X-Rspamd-Server: rspam02 X-Stat-Signature: bzsuqbnxcq5w6egm3i5gnuqjoc6sxwzg X-HE-Tag: 1702510612-479620 X-HE-Meta: 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 oFuPUFrW t5CuK40ZSLv+cN8CIPCOi3rXzfUgcjUKIzvb6QUjHqYfZ9XtKgB84aKTpSKxwjj+vHIOR+A0yoJvLgsXH0FpEIbv0KtevXpnsO0KcuaqEW5GU2ULnmxcqn8eeSeHjQ7ugD+arSanZM3P9lZYdssyNyndZe+3b0M+1iwwOCSdYtn/CkCT9h0NCm4v88UnR83tkBkTzayk8ytYsRF+EGcV/2S0Bvb6OtCckDddJGtCwYd6TlkY= 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. Reviewed-by: Alexander Potapenko Signed-off-by: Ilya Leoshkevich --- mm/kmsan/init.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/mm/kmsan/init.c b/mm/kmsan/init.c index ffedf4dbc49d..7a3df4d359f8 100644 --- a/mm/kmsan/init.c +++ b/mm/kmsan/init.c @@ -33,7 +33,10 @@ 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) || + /* Virtual address 0 is valid on s390. */ + (!IS_ENABLED(CONFIG_S390) && !nstart) || + !nend); nstart = ALIGN_DOWN(nstart, PAGE_SIZE); nend = ALIGN(nend, PAGE_SIZE); -- 2.43.0