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Wed, 25 Feb 2026 08:17:16 +0000 (UTC) Received: from MiWiFi-R3L-srv.redhat.com (unknown [10.72.112.55]) by mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 657C01800465; Wed, 25 Feb 2026 08:17:04 +0000 (UTC) From: Baoquan He To: kasan-dev@googlegroups.com Cc: linux-mm@kvack.org, andreyknvl@gmail.com, ryabinin.a.a@gmail.com, glider@google.com, dvyukov@google.com, linux-kernel@vger.kernel.org, linux-um@lists.infradead.org, linux-arm-kernel@lists.infradead.org, loongarch@lists.linux.dev, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, x86@kernel.org, chris@zankel.net, jcmvbkbc@gmail.com, linux-s390@vger.kernel.org, hca@linux.ibm.com, Baoquan He Subject: [PATCH v5 15/15] mm/kasan: clean up unneeded ARCH_DEFER_KASAN and kasan_arch_is_ready Date: Wed, 25 Feb 2026 16:14:12 +0800 Message-ID: <20260225081412.76502-16-bhe@redhat.com> In-Reply-To: <20260225081412.76502-1-bhe@redhat.com> References: <20260225081412.76502-1-bhe@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.111 X-Mimecast-MFC-PROC-ID: 92dgqxFJq5Zgb7jIb3xCVnP7h75r7mblbwGMeRCfe8w_1772007439 X-Mimecast-Originator: redhat.com Content-type: text/plain Content-Transfer-Encoding: 8bit X-Stat-Signature: qszetjoyew9uxxoxgcgbnd6qk46m6yck X-Rspam-User: X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: C8609100006 X-HE-Tag: 1772007447-83651 X-HE-Meta: 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 vqC6mCp1 8lbkniqeGVRFjhG+8Ayq2qJz3pVLLXC6D78FiPqD/DSFeqP4nawyW92bIt+kBmngwLjhb0U6ebdk3MgBC7S2Ar9KMQ5gQkVcFMJiwx0pS8JTpnL4d1QMUxn0TSH7Gv0X+D8x4SqTaEjKTJk0FiXbDcUa4pIT5bXwXxO4rHp0frzAeVtBOxiZkyp3AUO4NMz1YdWG2kei0XbDJu+MmnaGrr8J61aN/k9sn1YFSPO4SVTY2fmh1+gsw3t8g4XwyAAY5XgpfPGcNSoJ2sR6/CX2YLXqK+u3vRvUHkH5y7L09q8bobhQGwr7A34nbiqIi9CUOMW2jfoZnK0apqYqxM57pTKASXeYXtzFJ4M74mczagSiBjlG7EeuoZZx6XdEpuGnRIE/+xPPLDrs2XOoHmuP+EqRw4FuEWresuz9aPQW7AIYoes4S/pt/flTQDNPGpPTGD6S4lGZieWDKeoA= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Since commit 1e338f4d99e6 ("kasan: introduce ARCH_DEFER_KASAN and unify static key across modes"), kasan_arch_is_ready() has been dead code. And up to now, ARCH_DEFER_KASAN is useless too because of code change for 'kasan=on|off'. Here clean them up. Signed-off-by: Baoquan He --- arch/loongarch/Kconfig | 1 - arch/powerpc/Kconfig | 1 - arch/um/Kconfig | 1 - lib/Kconfig.kasan | 12 ------------ mm/kasan/kasan.h | 6 ------ 5 files changed, 21 deletions(-) diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig index d211c6572b0a..4b7802d02911 100644 --- a/arch/loongarch/Kconfig +++ b/arch/loongarch/Kconfig @@ -9,7 +9,6 @@ config LOONGARCH select ACPI_PPTT if ACPI select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI select ARCH_BINFMT_ELF_STATE - select ARCH_NEEDS_DEFER_KASAN select ARCH_DISABLE_KASAN_INLINE select ARCH_ENABLE_MEMORY_HOTPLUG select ARCH_ENABLE_MEMORY_HOTREMOVE diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index ad7a2fe63a2a..b51fbc25bdc9 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -122,7 +122,6 @@ config PPC # Please keep this list sorted alphabetically. # select ARCH_32BIT_OFF_T if PPC32 - select ARCH_NEEDS_DEFER_KASAN if PPC_RADIX_MMU select ARCH_DISABLE_KASAN_INLINE if PPC_RADIX_MMU select ARCH_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE select ARCH_ENABLE_MEMORY_HOTPLUG diff --git a/arch/um/Kconfig b/arch/um/Kconfig index 098cda44db22..fd0bedd2c696 100644 --- a/arch/um/Kconfig +++ b/arch/um/Kconfig @@ -6,7 +6,6 @@ config UML bool default y select ARCH_DISABLE_KASAN_INLINE if STATIC_LINK - select ARCH_NEEDS_DEFER_KASAN if STATIC_LINK select ARCH_WANTS_DYNAMIC_TASK_STRUCT select ARCH_HAS_CACHE_LINE_SIZE select ARCH_HAS_CPU_FINALIZE_INIT diff --git a/lib/Kconfig.kasan b/lib/Kconfig.kasan index a4bb610a7a6f..f82889a830fa 100644 --- a/lib/Kconfig.kasan +++ b/lib/Kconfig.kasan @@ -19,18 +19,6 @@ config ARCH_DISABLE_KASAN_INLINE Disables both inline and stack instrumentation. Selected by architectures that do not support these instrumentation types. -config ARCH_NEEDS_DEFER_KASAN - bool - -config ARCH_DEFER_KASAN - def_bool y - depends on KASAN && ARCH_NEEDS_DEFER_KASAN - help - Architectures should select this if they need to defer KASAN - initialization until shadow memory is properly set up. This - enables runtime control via static keys. Otherwise, KASAN uses - compile-time constants for better performance. - config CC_HAS_KASAN_GENERIC def_bool $(cc-option, -fsanitize=kernel-address) diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h index fc9169a54766..f08f7f75c285 100644 --- a/mm/kasan/kasan.h +++ b/mm/kasan/kasan.h @@ -552,12 +552,6 @@ static inline void kasan_poison_last_granule(const void *address, size_t size) { #endif /* CONFIG_KASAN_GENERIC */ -#ifndef kasan_arch_is_ready -static inline bool kasan_arch_is_ready(void) { return true; } -#elif !defined(CONFIG_KASAN_GENERIC) || !defined(CONFIG_KASAN_OUTLINE) -#error kasan_arch_is_ready only works in KASAN generic outline mode! -#endif - #if IS_ENABLED(CONFIG_KASAN_KUNIT_TEST) void kasan_kunit_test_suite_start(void); -- 2.52.0