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Wed, 25 Feb 2026 08:15:19 +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 BFB231800465; Wed, 25 Feb 2026 08:15:08 +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 04/15] mm/kasan: make kasan=on|off take effect for all three modes Date: Wed, 25 Feb 2026 16:14:01 +0800 Message-ID: <20260225081412.76502-5-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: fvIh9ahUPoZbzi1oE_NZt1X1oLVqD1N1CjhFbrhEKTs_1772007319 X-Mimecast-Originator: redhat.com Content-type: text/plain Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Queue-Id: 32B1C80009 X-Rspamd-Server: rspam02 X-Stat-Signature: 8m6ne5aiybgn6ot9a1hdkxwwrnog18ys X-HE-Tag: 1772007329-310705 X-HE-Meta: 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 f+2w+gwv SuVQLGLsb5CUqKAvz/WnuRRRYFFtepoc3iL2w6dX3qWfKW/zOGPSMyRtXmO2x6nUuBYe9vjrzqA1YdJiwU0Emff1Yt+UjWMTpIQP5cwPgt3cAXcLyD+gzWszP3t44d9KpkEiQ0FVq3L4HaIfUvQAFwMD5u5UysAiYDFqTtKInDWL+YSpPe7RMsSYZCOWrLIVBZZgIJV+/SHguKcXULpyX08pGILbXULIbwXsb9LljT3pYC6GFop/uKxIGG7P45/XFyd8KdHHDK9HVKVmDmnj80g3M8UNSzoD8s+yO1p7KKImg+uEwfYuNUC/AFkxIt2fayw8W/5Jk+NGU5XBkuOpk8Ys3zkFxpshasrCnmCX9tPfEpy6tP/WfAWLbCdJZI1BkXPU9vZQYYr/1eBXGb2LGPOY6rQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Now everything is ready, setting kasan=off can disable kasan for all three modes. Signed-off-by: Baoquan He --- include/linux/kasan-enabled.h | 12 +++++------- mm/kasan/common.c | 4 ---- 2 files changed, 5 insertions(+), 11 deletions(-) diff --git a/include/linux/kasan-enabled.h b/include/linux/kasan-enabled.h index b7cb906825ca..cec21a08446e 100644 --- a/include/linux/kasan-enabled.h +++ b/include/linux/kasan-enabled.h @@ -4,10 +4,11 @@ #include -#if defined(CONFIG_ARCH_DEFER_KASAN) || defined(CONFIG_KASAN_HW_TAGS) +#ifdef CONFIG_KASAN +extern bool kasan_arg_disabled; + /* * Global runtime flag for KASAN modes that need runtime control. - * Used by ARCH_DEFER_KASAN architectures and HW_TAGS mode. */ DECLARE_STATIC_KEY_FALSE(kasan_flag_enabled); @@ -25,18 +26,15 @@ static inline void kasan_enable(void) static_branch_enable(&kasan_flag_enabled); } #else -/* For architectures that can enable KASAN early, use compile-time check. */ static __always_inline bool kasan_enabled(void) { - return IS_ENABLED(CONFIG_KASAN); + return false; } static inline void kasan_enable(void) {} -#endif /* CONFIG_ARCH_DEFER_KASAN || CONFIG_KASAN_HW_TAGS */ +#endif #ifdef CONFIG_KASAN_HW_TAGS -extern bool kasan_arg_disabled; - static inline bool kasan_hw_tags_enabled(void) { return kasan_enabled(); diff --git a/mm/kasan/common.c b/mm/kasan/common.c index 0d788a468e96..fc6513fa5795 100644 --- a/mm/kasan/common.c +++ b/mm/kasan/common.c @@ -33,16 +33,13 @@ #include "kasan.h" #include "../slab.h" -#if defined(CONFIG_ARCH_DEFER_KASAN) || defined(CONFIG_KASAN_HW_TAGS) /* * Definition of the unified static key declared in kasan-enabled.h. * This provides consistent runtime enable/disable across KASAN modes. */ DEFINE_STATIC_KEY_FALSE(kasan_flag_enabled); EXPORT_SYMBOL_GPL(kasan_flag_enabled); -#endif -#ifdef CONFIG_KASAN_HW_TAGS bool kasan_arg_disabled __ro_after_init; /* kasan=off/on */ @@ -61,7 +58,6 @@ static int __init early_kasan_flag(char *arg) return 0; } early_param("kasan", early_kasan_flag); -#endif struct slab *kasan_addr_to_slab(const void *addr) { -- 2.52.0