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Wed, 10 Jan 2024 04:17:02 GMT Received: from smtpav05.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id DDA2520040; Wed, 10 Jan 2024 04:17:01 +0000 (GMT) Received: from smtpav05.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 69AE02004D; Wed, 10 Jan 2024 04:17:01 +0000 (GMT) Received: from ozlabs.au.ibm.com (unknown [9.192.253.14]) by smtpav05.fra02v.mail.ibm.com (Postfix) with ESMTP; Wed, 10 Jan 2024 04:17:01 +0000 (GMT) Received: from [10.61.2.106] (haven.au.ibm.com [9.192.254.114]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ozlabs.au.ibm.com (Postfix) with ESMTPSA id 0781C60218; Wed, 10 Jan 2024 15:16:59 +1100 (AEDT) Message-ID: Date: Wed, 10 Jan 2024 15:16:58 +1100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 09/13] powerpc: Disable KMSAN checks on functions which walk the stack Content-Language: en-US To: Christophe Leroy , "glider@google.com" , "elver@google.com" , "dvyukov@google.com" , "akpm@linux-foundation.org" , "mpe@ellerman.id.au" , "npiggin@gmail.com" Cc: "linux-mm@kvack.org" , "kasan-dev@googlegroups.com" , "iii@linux.ibm.com" , "linuxppc-dev@lists.ozlabs.org" , "linux-kernel@vger.kernel.org" References: <20231214055539.9420-1-nicholas@linux.ibm.com> <20231214055539.9420-10-nicholas@linux.ibm.com> From: Nicholas Miehlbradt In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: lXcvNy98EeOQfMelbTu7LH7BnZ-p2zEy X-Proofpoint-ORIG-GUID: XtMIHxtsP68xzx66riI-pk7vgjKZbboK 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=2024-01-09_13,2024-01-09_02,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 lowpriorityscore=0 suspectscore=0 bulkscore=0 phishscore=0 mlxscore=0 impostorscore=0 clxscore=1015 mlxlogscore=573 malwarescore=0 priorityscore=1501 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311290000 definitions=main-2401100032 X-Rspamd-Queue-Id: 5E372140014 X-Rspam-User: X-Rspamd-Server: rspam05 X-Stat-Signature: bf5c6nz5akjyj7btwmqb3jmte9mo3gfr X-HE-Tag: 1704860233-673841 X-HE-Meta: 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 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 14/12/2023 8:00 pm, Christophe Leroy wrote: > > > Le 14/12/2023 à 06:55, Nicholas Miehlbradt a écrit : >> Functions which walk the stack read parts of the stack which cannot be >> instrumented by KMSAN e.g. the backchain. Disable KMSAN sanitization of >> these functions to prevent false positives. > > Do other architectures have to do it as well ? > > I don't see it for show_stack(), is that a specific need for powerpc ? > Other archs have the annotation on functions called by show_stack(). For x86 it's on show_trace_log_lvl() and for s390 it's on __unwind_start() and unwind_next_frame().