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Fri, 18 Jul 2025 12:38:58 GMT Received: from smtpav07.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 2046320043; Fri, 18 Jul 2025 12:38:58 +0000 (GMT) Received: from smtpav07.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 1EE6320040; Fri, 18 Jul 2025 12:38:57 +0000 (GMT) Received: from li-008a6a4c-3549-11b2-a85c-c5cc2836eea2.ibm.com (unknown [9.87.132.117]) by smtpav07.fra02v.mail.ibm.com (Postfix) with ESMTPS; Fri, 18 Jul 2025 12:38:57 +0000 (GMT) Date: Fri, 18 Jul 2025 14:38:55 +0200 From: Alexander Gordeev To: Sabyrzhan Tasbolatov Cc: hca@linux.ibm.com, christophe.leroy@csgroup.eu, andreyknvl@gmail.com, akpm@linux-foundation.org, ryabinin.a.a@gmail.com, glider@google.com, dvyukov@google.com, kasan-dev@googlegroups.com, linux-kernel@vger.kernel.org, loongarch@lists.linux.dev, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-um@lists.infradead.org, linux-mm@kvack.org Subject: Re: [PATCH v3 01/12] lib/kasan: introduce CONFIG_ARCH_DEFER_KASAN option Message-ID: References: <20250717142732.292822-1-snovitoll@gmail.com> <20250717142732.292822-2-snovitoll@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250717142732.292822-2-snovitoll@gmail.com> X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=baBrUPPB c=1 sm=1 tr=0 ts=687a4065 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=kj9zAlcOel0A:10 a=Wb1JkmetP80A:10 a=VwQbUJbxAAAA:8 a=pGLkceISAAAA:8 a=VnNF1IyMAAAA:8 a=rZjtdVduxoVio5-WNGsA:9 a=CjuIK1q_8ugA:10 X-Proofpoint-GUID: TIZuJKi-67oCtWCVyBaOzGkgvN5R-ziL X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNzE4MDA5NSBTYWx0ZWRfX9lurX+WMoby6 8zcw73eBKusO/lI+fsmCswX0W79oAVCdmpWWb4RuL1URCtCPr4UEgtPltbmXzVNehUUi+T6eXmX 4eRfKFVrYpQ27eew83zzkR+KyuIm1pQkr4MRD/AMDdQizk/b9vGMDa1q1wFOSHN5j5u9CnlZbL9 PESfid7SFSM0zgNdAzD4h3+2AH7N3meARpmGt4UYroHp52sEdyKNpU1m+lbZRTrhHRUqCkTR4mP XWoRcVftiHuDpvOuX3q6S+bAsHfKZ6bUJr9scbjn8qAF/4vinEoTry9C4Lmi2gT7K9g7WEn0Shd IiPx1DI0r79VdBlpJzSfqa6yL5WUqhVubuUr7+O86v5JQgeMPPDFrMF1/F8Kp0Nr1jlKGElFa6Z y0z4sKH9jyuS5QG1lBc3a5pv6JbP4TtcPkaYW48k52mMSRsuFypEQKvGct4XoCyYnk4yLR6k X-Proofpoint-ORIG-GUID: peX60BBMnw2ocO_Fy1XuuKvylFqoptJa X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-07-18_02,2025-07-17_02,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 mlxlogscore=820 suspectscore=0 adultscore=0 impostorscore=0 phishscore=0 lowpriorityscore=0 priorityscore=1501 clxscore=1015 mlxscore=0 malwarescore=0 spamscore=0 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2505280000 definitions=main-2507180095 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250718_053908_540182_8CA6CAF8 X-CRM114-Status: GOOD ( 16.88 ) X-BeenThere: linux-um@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-um" Errors-To: linux-um-bounces+linux-um=archiver.kernel.org@lists.infradead.org On Thu, Jul 17, 2025 at 07:27:21PM +0500, Sabyrzhan Tasbolatov wrote: > Introduce CONFIG_ARCH_DEFER_KASAN to identify architectures that need > to defer KASAN initialization until shadow memory is properly set up. > > Some architectures (like PowerPC with radix MMU) need to set up their > shadow memory mappings before KASAN can be safely enabled, while others > (like s390, x86, arm) can enable KASAN much earlier or even from the > beginning. > > This option allows us to: > 1. Use static keys only where needed (avoiding overhead) > 2. Use compile-time constants for arch that don't need runtime checks > 3. Maintain optimal performance for both scenarios > > Architectures that need deferred KASAN should select this option. > Architectures that can enable KASAN early will get compile-time > optimizations instead of runtime checks. > > Closes: https://bugzilla.kernel.org/show_bug.cgi?id=217049 > Signed-off-by: Sabyrzhan Tasbolatov > --- > Changes in v3: > - Introduced CONFIG_ARCH_DEFER_KASAN to control static key usage > --- > lib/Kconfig.kasan | 8 ++++++++ > 1 file changed, 8 insertions(+) Acked-by: Alexander Gordeev # s390