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Fri, 21 Jun 2024 00:26:44 +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 v6 21/39] kmsan: Accept ranges starting with 0 on s390 Date: Fri, 21 Jun 2024 02:24:55 +0200 Message-ID: <20240621002616.40684-22-iii@linux.ibm.com> X-Mailer: git-send-email 2.45.1 In-Reply-To: <20240621002616.40684-1-iii@linux.ibm.com> References: <20240621002616.40684-1-iii@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: 1AqOcpwzwafdX484ppd5O8j1ZYWTiJo2 X-Proofpoint-ORIG-GUID: FgwbXccNBqEcPSn3Bplx5nbUcnlWVihd 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=2024-06-20_09,2024-06-20_04,2024-05-17_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 impostorscore=0 mlxlogscore=999 spamscore=0 adultscore=0 phishscore=0 mlxscore=0 lowpriorityscore=0 malwarescore=0 priorityscore=1501 bulkscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2406140001 definitions=main-2406200174 X-Stat-Signature: xfx51cn3psh9z6t61t93mpe7mjk856ge X-Rspamd-Queue-Id: 0ADC9140011 X-Rspam-User: X-Rspamd-Server: rspam10 X-HE-Tag: 1718929619-904801 X-HE-Meta: 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 PegY2u9+ VyALjeqqOG9yJT/t3/8KXgei1cBhoy+d6VV0Ey5NVn0YlxNOJmN65ZACNEdLIldHaOiXQkzUL/ngmmOwKkZMNbNuivZA9SPQJHUfH47haF9lQgJLmec6HZqbQmkhm3sMnmkNTUG6r5q7cXnvBvAgTxq76uvbPYkWMxeeDk92pbsZSKcnQwnfZdIZgJ66a+BUya6Tx6Qf2dDhMjGRe/mnFtSIEM9T/ueJY8OZ/8YPAKBZv9Ou7/9HS2feVw0kvLXCeb6eppWVlEFDOX8Qukifgob8659a4LXWafHXWRUv2c/ev/6p6m5hvVSGm466BGifWPshSoKPiIiNb5lg= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000003, 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);