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Wed, 19 Jun 2024 15:45:40 +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 v5 20/37] kmsan: Accept ranges starting with 0 on s390 Date: Wed, 19 Jun 2024 17:43:55 +0200 Message-ID: <20240619154530.163232-21-iii@linux.ibm.com> X-Mailer: git-send-email 2.45.1 In-Reply-To: <20240619154530.163232-1-iii@linux.ibm.com> References: <20240619154530.163232-1-iii@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: t-6NhsbZHDQnXiNF0uBfPW5-9PdLjO1W X-Proofpoint-ORIG-GUID: Kj9sxnPHfaNJvrcvSASovW9PrvrbuQr1 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.28.16 definitions=2024-06-19_02,2024-06-19_01,2024-05-17_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxlogscore=990 adultscore=0 suspectscore=0 spamscore=0 phishscore=0 bulkscore=0 mlxscore=0 impostorscore=0 priorityscore=1501 clxscore=1015 malwarescore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2405170001 definitions=main-2406190115 X-Rspamd-Server: rspam03 X-Rspam-User: X-Rspamd-Queue-Id: B5A0140020 X-Stat-Signature: j3xx7g4ccduhy65bjptwhehdaa7erp31 X-HE-Tag: 1718811955-349027 X-HE-Meta: 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 4pdBN8gJ VdOqCGL1TVinRS/y3z/TKe/ks5SVQt7HY+NmRarstcwMWgBKvPrwHQZwXSST0BBREwlvW7PqYTG/QH5WDWLUpdSRepu08pzttmzVXcr8Aq7oFoMVdIUCts7Z422DRHZsb4ei2H2N5izUVYcXpe0WQlLfhVQ2+m1l3mtWyztUHh5Pc+UGzpzR5SUKN36tU1+gO5rj2ZN+S+Jf0bmYp6/r0y/fGi4wekIfRC9HIjR+VkBandtWXIVtGrVhdIq394CrKxMBGq3XNsLEMCLv0oJjNV5KTE7nr4SIhH6tySVavYADuqWt0MpzQJhsIHWtsGnnTOVmd6I1qL7ELZHc4OtC04P7EkGXNxgvBvIBQCV8CXmq3bp8= 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 9de76ac7062c..3f8b1bbb9060 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);