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Fri, 16 Jan 2026 05:36:10 -0800 (PST) Message-ID: <901fa77a-b23d-4268-81aa-fc76846ac73b@gmail.com> Date: Fri, 16 Jan 2026 14:35:24 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v8 04/14] x86/kasan: Add arch specific kasan functions To: Maciej Wieczor-Retman , Alexander Potapenko , Andrey Konovalov , Dmitry Vyukov , Vincenzo Frascino , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Andrew Morton , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Axel Rasmussen , Yuanchu Xie , Wei Xu Cc: Maciej Wieczor-Retman , kasan-dev@googlegroups.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org References: <785eb728e2cc897e05ee709d42214172be481ab9.1768233085.git.m.wieczorretman@pm.me> Content-Language: en-US From: Andrey Ryabinin In-Reply-To: <785eb728e2cc897e05ee709d42214172be481ab9.1768233085.git.m.wieczorretman@pm.me> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 4B39F1C000B X-Rspamd-Server: rspam06 X-Stat-Signature: 1b1zyycea41mqpcn7dpiwru5a37ubhrz X-Rspam-User: X-HE-Tag: 1768570573-784432 X-HE-Meta: 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 HZKiP726 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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 1/12/26 6:27 PM, Maciej Wieczor-Retman wrote: > From: Maciej Wieczor-Retman > > KASAN's software tag-based mode needs multiple macros/functions to > handle tag and pointer interactions - to set, retrieve and reset tags > from the top bits of a pointer. > > Mimic functions currently used by arm64 but change the tag's position to > bits [60:57] in the pointer. > > Signed-off-by: Maciej Wieczor-Retman > --- Reviewed-by: Andrey Ryabinin