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Tue, 25 Feb 2025 13:38:09 -0800 (PST) MIME-Version: 1.0 References: <168f775c4587f3a1338271390204a9fe16b150dd.1739866028.git.maciej.wieczor-retman@intel.com> In-Reply-To: From: Andrey Konovalov Date: Tue, 25 Feb 2025 22:37:58 +0100 X-Gm-Features: AWEUYZnS8GVd3ERRXhXkc6hjvKnRC5lEIY-bHuz7PF3TjilwVr_-TxB6baR4YG8 Message-ID: Subject: Re: [PATCH v2 01/14] kasan: sw_tags: Use arithmetic shift for shadow computation To: Maciej Wieczor-Retman Cc: kees@kernel.org, julian.stecklina@cyberus-technology.de, kevinloughlin@google.com, peterz@infradead.org, tglx@linutronix.de, justinstitt@google.com, catalin.marinas@arm.com, wangkefeng.wang@huawei.com, bhe@redhat.com, ryabinin.a.a@gmail.com, kirill.shutemov@linux.intel.com, will@kernel.org, ardb@kernel.org, jason.andryuk@amd.com, dave.hansen@linux.intel.com, pasha.tatashin@soleen.com, guoweikang.kernel@gmail.com, dwmw@amazon.co.uk, mark.rutland@arm.com, broonie@kernel.org, apopple@nvidia.com, bp@alien8.de, rppt@kernel.org, kaleshsingh@google.com, richard.weiyang@gmail.com, luto@kernel.org, glider@google.com, pankaj.gupta@amd.com, pawan.kumar.gupta@linux.intel.com, kuan-ying.lee@canonical.com, tony.luck@intel.com, tj@kernel.org, jgross@suse.com, dvyukov@google.com, baohua@kernel.org, samuel.holland@sifive.com, dennis@kernel.org, akpm@linux-foundation.org, thomas.weissschuh@linutronix.de, surenb@google.com, kbingham@kernel.org, ankita@nvidia.com, nathan@kernel.org, ziy@nvidia.com, xin@zytor.com, rafael.j.wysocki@intel.com, andriy.shevchenko@linux.intel.com, cl@linux.com, jhubbard@nvidia.com, hpa@zytor.com, scott@os.amperecomputing.com, david@redhat.com, jan.kiszka@siemens.com, vincenzo.frascino@arm.com, corbet@lwn.net, maz@kernel.org, mingo@redhat.com, arnd@arndb.de, ytcoode@gmail.com, xur@google.com, morbo@google.com, thiago.bauermann@linaro.org, linux-doc@vger.kernel.org, kasan-dev@googlegroups.com, linux-kernel@vger.kernel.org, llvm@lists.linux.dev, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, x86@kernel.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspam-User: X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: DA5AC20005 X-Stat-Signature: ru6myg6dzsqq4gpybghfmwtbhxh7g6sh X-HE-Tag: 1740519490-78962 X-HE-Meta: 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 Z7PU2vN9 xj+AL0wb7tvKS9xrlOnZyWRLJMD9CuOGxDV/7NOU13XVyD/qga0QKvwD1RB33yajp/MYerDX1dPHQ1QvM1POEisSWrdQ/CQxYCkJz9NYyvKNAgeX8OqRqQviN99+UnJxfwHMGgsf4mXUn7pTv0q5ipBSfEkNRP4f/yr+5VTbruEec1lcmMm13URpizq1gZtzLmepAONdtLJz94M4eErlKwHSN3UM4TviJ7c1wV1OIqHzvqmYEPIlhEKEn1lMjojDka1hvGdXkcJdBVPzz/CwlVjYopuyNkJWZMA2tFIrC1KD65DmrlLQWtTQ5oXU8ILEZ8UAQQts09c73eHRWs5Pk3cm1BXWnu7qA411oA6tljUz1QiPccJShzFh9bUJ4V5SbjrhaeKcJHj5Y4hENCumwMa0DZgGFc2oBe+3a9lRVPVb2T4wOwqORMKS1lUaxDWviDXpmbN2Vd79HLnh0CSTSGzeWyijdKS7koNXVuq3sLEZWmVU= 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 Tue, Feb 25, 2025 at 6:21=E2=80=AFPM Maciej Wieczor-Retman wrote: > > >> I wanted to have the shadow memory boundries aligned properly, to not = waste page > >> table entries, so the memory map is more straight forward. This patch = helps with > >> that, I don't think it would have worked without it. > > > >Ok, I see - let's add this info into the commit message then. > > Sure, but if you like the 0xffeffc0000000000 offset I'll just drop this p= art. Sure, assuming it works, I like this address :) But to be fair, I like any fixed address better than using a runtime const, just to avoid the complexity.