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Fri, 05 Dec 2025 07:07:25 -0800 (PST) MIME-Version: 1.0 References: <20251128033320.1349620-1-bhe@redhat.com> In-Reply-To: From: Andrey Konovalov Date: Fri, 5 Dec 2025 16:07:14 +0100 X-Gm-Features: AQt7F2pv1BpZjdGZf4uiwOOKMqx6h_y-AphkDn6MuXmCXnyvxBMukG84fsup2wA Message-ID: Subject: Re: [PATCH v4 00/12] mm/kasan: make kasan=on|off work for all three modes To: Baoquan He Cc: linux-mm@kvack.org, ryabinin.a.a@gmail.com, glider@google.com, dvyukov@google.com, vincenzo.frascino@arm.com, akpm@linux-foundation.org, kasan-dev@googlegroups.com, linux-kernel@vger.kernel.org, kexec@lists.infradead.org, elver@google.com, sj@kernel.org, lorenzo.stoakes@oracle.com, snovitoll@gmail.com, christophe.leroy@csgroup.eu Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspam-User: X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 36D5880007 X-Stat-Signature: i1th5uzqhji5q19rmfa54kkgksa9x9c8 X-HE-Tag: 1764947246-205392 X-HE-Meta: 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 zejoL9kR 14gpNfLJ+HHNTwMc5e+VjmGLeMhAENrYwC4pdp7ODoRW8qG2Tg4ge228U0/F9MKV3+vquQNW3+1bm2iqO0aIls24HpnkdG+XPah2xdkiBnEXxD63pTy5h7hgrx5x8WN3HJPLKhsR2kC72p+Kco2Jmy5PEoB0Rct3CPqgNe14z4vnS1CJMfBWVMRA0zZNWo+S75feZfrTzsBU3NtHFfvUmySXBqHGKM2vkibivcJqEsEpzHzIaTBy9QhtWlriC07uygAwjPRdb9oe/cpfNwJmdav4vvH0rNPc3I1QRziWmdRiGUbnuy93kukQacVelReC/XigGeSEvDcODw0JfkucIyGDHghZAUMxWqyJmNiQQMTXEYeBqrFOnHu70+o/aPsoLwtIjSn40v6aWStqqBOlnDGSRAqcFI9f546MOtVhXlwmOxXMMiUpxFfq3jH3RnPWvM4Cd 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 Fri, Dec 5, 2025 at 8:14=E2=80=AFAM Baoquan He wrote: > > > I also wonder if we should keep this kasan=3Doff functionality > > conservative and limit it to x86 and arm64 (since these are the only > > two tested architectures). > > We may not need to do that. I tested on arm64 because it has sw_tags and > hw_tags. And if x86_64 and arm64 works well with kasan=3Doff in generic > mode, it should be fine on other architectures. I am a little more > familiar with operations on x86/arm64 than others. I can manage to get > power system to test kasan=3Doff in generic mode, if that is required. > From my side, I would like to see x86_64/arm64/s390/power to have > kasan=3Doff because RHEL support these architectures. I need consult peop= le > to make clear how to change in s390. Will post patch later or ask other > people to help do that. > > While there seems to be no reason we don't let other arch-es have this > benefit if the underlying code has paved the way, the arch side only need= s > two lines of judgement code. Personal opinion. OK, but it would be great if the arch maintainers could review and test the changes.