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Wed, 25 Jun 2025 12:35:53 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 87F7D8B7B7; Wed, 25 Jun 2025 12:35:53 +0200 (CEST) X-Virus-Scanned: amavisd-new at c-s.fr Received: from messagerie.si.c-s.fr ([127.0.0.1]) by localhost (messagerie.si.c-s.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id Tp4ps0JWzqlx; Wed, 25 Jun 2025 12:35:53 +0200 (CEST) Received: from [192.168.235.99] (unknown [192.168.235.99]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 942C38B7A7; Wed, 25 Jun 2025 12:35:51 +0200 (CEST) Message-ID: Date: Wed, 25 Jun 2025 12:35:51 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/9] kasan: unify static kasan_flag_enabled across modes To: Sabyrzhan Tasbolatov , ryabinin.a.a@gmail.com, glider@google.com, andreyknvl@gmail.com, dvyukov@google.com, vincenzo.frascino@arm.com, catalin.marinas@arm.com, will@kernel.org, chenhuacai@kernel.org, kernel@xen0n.name, maddy@linux.ibm.com, mpe@ellerman.id.au, npiggin@gmail.com, hca@linux.ibm.com, gor@linux.ibm.com, agordeev@linux.ibm.com, borntraeger@linux.ibm.com, svens@linux.ibm.com, richard@nod.at, anton.ivanov@cambridgegreys.com, johannes@sipsolutions.net, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, chris@zankel.net, jcmvbkbc@gmail.com, akpm@linux-foundation.org Cc: guoweikang.kernel@gmail.com, geert@linux-m68k.org, rppt@kernel.org, tiwei.btw@antgroup.com, richard.weiyang@gmail.com, benjamin.berg@intel.com, kevin.brodsky@arm.com, kasan-dev@googlegroups.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, loongarch@lists.linux.dev, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, linux-um@lists.infradead.org, linux-mm@kvack.org References: <20250625095224.118679-1-snovitoll@gmail.com> <20250625095224.118679-2-snovitoll@gmail.com> Content-Language: fr-FR From: Christophe Leroy In-Reply-To: <20250625095224.118679-2-snovitoll@gmail.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 6947640006 X-Stat-Signature: kxzem7cdfgjb4uudxixf5whr6fd37qxq X-HE-Tag: 1750847755-97931 X-HE-Meta: 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 WT5DvXb/ sKBPQQa+zJQjO2rl8+HOIwziynGBe0sd3q9FyZVsBkXzuY0td7F+9Bzkmbdr2XGGSB5aimiSST0VWWlqdiNhHmY8yv5Q8OtdGjQ12YJ2QS8ovybrw6n6Hks377Ez7u5kFtlP+txZIaWfhvETFQDtOZ29rVpWJKoArU+0dPuoRRAHm/11fqqQ4siC9iglFB6M19M98dcltN18gHauLNk7Tyq7Td+oNg2d80t/OzvBvWnmsZaQV/XcZ9oxgj7jPsDhFwVzepo7FN1MCMCUNp26eqfumZD7pgOz1ohn+H6eHoqR1SPu3eni40X0dkQ== 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: Le 25/06/2025 à 11:52, Sabyrzhan Tasbolatov a écrit : > Historically the fast-path static key `kasan_flag_enabled` existed > only for `CONFIG_KASAN_HW_TAGS`. Generic and SW_TAGS either relied on > `kasan_arch_is_ready()` or evaluated KASAN checks unconditionally. > As a result every architecture had to toggle a private flag > in its `kasan_init()`. > > This patch turns the flag into a single global runtime predicate that > is built for every `CONFIG_KASAN` mode and adds a helper that flips > the key once KASAN is ready. Shouldn't kasan_init_generic() also perform the following line to reduce even more code duplication between architectures ? init_task.kasan_depth = 0; Christophe