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Peter Anvin" , Andrew Morton , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Samuel Holland , Maciej Wieczor-Retman , linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org Subject: Re: [PATCH v7 02/15] kasan: arm64: x86: Make special tags arch specific Message-ID: In-Reply-To: References: <0db7ec3b1a813b4d9e3aa8648b3c212166a248b7.1765386422.git.m.wieczorretman@pm.me> Feedback-ID: 164464600:user:proton X-Pm-Message-ID: 0570fdf76a1b4710800e4cf7ba907d1afc4ce5d7 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Rspamd-Queue-Id: 07ECB4000B X-Rspamd-Server: rspam06 X-Stat-Signature: zdmjxteg3ecuw9nttwef6ahto59o1cco X-Rspam-User: X-HE-Tag: 1767965877-902813 X-HE-Meta: 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 PlMgcfr2 Dgh6UQXe3DgFQtD/7cm4gDry/c/4IZp734BxNAkxtfn/fZDXx9gpPgVZLLX/8XNKVVCg4nD3UQJBUKe9N63ND+rZt8EFrljJ3LrUiNth61uQ9jbZQvv/LxIkpbMidTG3P3jF7Tq5VRZ7X1EskQtE2Nz9Wiuy+4vvE8T2jHkNBuelkADzL58Yr/WJ38YBZjhtxZjxLryJImNR9xiSZbqormhVAlmCYmEoIiE3Ye30D1Y5k6PRdTifZ81JrQ15DlK1foY/h3cTn1Y8AL2+IIa7a97cZctphS0s8hz8J3q0Fd+AosVY= 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: Hi, and thanks for looking at the patches! On 2026-01-08 at 17:56:39 +0000, Will Deacon wrote: >On Wed, Dec 10, 2025 at 05:28:43PM +0000, Maciej Wieczor-Retman wrote: >> From: Samuel Holland ... >> +#ifdef CONFIG_KASAN_HW_TAGS >> +#define KASAN_TAG_MIN=09=090xF0 /* minimum value for random tags */ >> +#define KASAN_TAG_WIDTH=09=094 >> +#else >> +#define KASAN_TAG_WIDTH=09=098 >> +#endif > >Shouldn't this be 0 when KASAN is not in use at all? > >Will This file (as well as the x86 version) gets included in include/linux/kasan-tags.h: =09#if defined(CONFIG_KASAN_SW_TAGS) || defined(CONFIG_KASAN_HW_TAGS) =09#include =09#endif =09#ifndef KASAN_TAG_WIDTH =09#define KASAN_TAG_WIDTH=09=090 =09#endif So the 8 or 4 value is only assigned if SW_TAGS or HW_TAGS are enabled. Otherwise it's set to zero. --=20 Kind regards Maciej Wiecz=C3=B3r-Retman