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Wed, 20 Aug 2025 05:35:39 +0000 (UTC) Received: from MiWiFi-R3L-srv.redhat.com (unknown [10.72.112.99]) by mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 9FD9E19560B0; Wed, 20 Aug 2025 05:35:29 +0000 (UTC) From: Baoquan He To: linux-mm@kvack.org Cc: ryabinin.a.a@gmail.com, andreyknvl@gmail.com, glider@google.com, dvyukov@google.com, vincenzo.frascino@arm.com, akpm@linux-foundation.org, kasan-dev@googlegroups.com, linux-kernel@vger.kernel.org, kexec@lists.infradead.org, sj@kernel.org, lorenzo.stoakes@oracle.com, elver@google.com, snovitoll@gmail.com, christophe.leroy@csgroup.eu, Baoquan He Subject: [PATCH v3 03/12] mm/kasan/sw_tags: don't initialize kasan if it's disabled Date: Wed, 20 Aug 2025 13:34:50 +0800 Message-ID: <20250820053459.164825-4-bhe@redhat.com> In-Reply-To: <20250820053459.164825-1-bhe@redhat.com> References: <20250820053459.164825-1-bhe@redhat.com> MIME-Version: 1.0 Content-type: text/plain Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 33D80C0005 X-Stat-Signature: d5u45xsgiwh7khqu7q95kxkis71ow1ar X-Rspam-User: X-HE-Tag: 1755668146-222434 X-HE-Meta: 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 qkIsY9FS LW9/UY8w/NrEkOTNX3ZDBB4vyDi6EZV1/cIuHVLNsYN6GT+ghqVwBbNqG4aedaSboLbmufapvg3DEGsGUXPqhae01qg5z6xIA/a493b0opgIWHreNMWJw65GdYk2yT5ShuAPxQv2ClAOw4My/UPLK713VvZMXXdAOYZOc8Bs55HWWes6SRWT8wPvfiA== 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: And also add code to enable kasan_flag_enabled, this is for later usage. Signed-off-by: Baoquan He --- mm/kasan/sw_tags.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/mm/kasan/sw_tags.c b/mm/kasan/sw_tags.c index 01f19bc4a326..dd963ba4d143 100644 --- a/mm/kasan/sw_tags.c +++ b/mm/kasan/sw_tags.c @@ -40,11 +40,17 @@ void __init kasan_init_sw_tags(void) { int cpu; + if (kasan_arg_disabled) + return; + for_each_possible_cpu(cpu) per_cpu(prng_state, cpu) = (u32)get_cycles(); kasan_init_tags(); + /* KASAN is now initialized, enable it. */ + static_branch_enable(&kasan_flag_enabled); + pr_info("KernelAddressSanitizer initialized (sw-tags, stacktrace=%s)\n", str_on_off(kasan_stack_collection_enabled())); } -- 2.41.0