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Wed, 25 Feb 2026 08:16:31 +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 5C45A1800465; Wed, 25 Feb 2026 08:16:20 +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 11/15] arch/x86: don't initialize kasan if it's disabled Date: Wed, 25 Feb 2026 16:14:08 +0800 Message-ID: <20260225081412.76502-12-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: -XF-B-xhLrbDie7OOo-1sDgF7rvRFzQl4zmvlG_fQuw_1772007391 X-Mimecast-Originator: redhat.com Content-type: text/plain Content-Transfer-Encoding: 8bit X-Rspam-User: X-Stat-Signature: 7maea1pdtges3scpoutd618ga943w3y6 X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: C9E61A000B X-HE-Tag: 1772007399-453589 X-HE-Meta: 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 +EuQbXj3 N7Ph5u9rl+VU74Jjw30UHEwiUYKKuhqmO08FUMEAWCu8PE2gEn/4zSwXPDha6St5ik5ql4zv0vjxO3mUhL1sS3cEglC9xDMmIsx2kHFmLUtstTsQsNOr6bKTfma3ZanHu3FIIfPb6iXCQYg56575GFb51wsw/wYRiBWDg7LDNOqCZHdjq8YHH82SC6AE4j/rBe3/hiVYxLEpAbOzZ2gHeUisgT/IKzVvzTfPav7Ppewf5ieFWX1+MYIQPdL+/5xHcrvf/o2UYblL0EbeACWsIoBn/biieyuj+lUSTjxIoXvEiVT0zisoaB01rZLzeTSXmS6MRN60cM+d0hyqogMBX4EhH0hY2fWtLhmJ/bxpIA+QzI+SPRqYh08tCaQaafz8BHQRIpJwg810TzP+Kn6SzES2rMJtX4aAYZDirIgwBTK0jf78= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Here, kasan is disabled if specified 'kasan=off' in kernel cmdline. Signed-off-by: Baoquan He Cc: x86@kernel.org --- arch/x86/mm/kasan_init_64.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/x86/mm/kasan_init_64.c b/arch/x86/mm/kasan_init_64.c index 998b6010d6d3..5ebf2850c77d 100644 --- a/arch/x86/mm/kasan_init_64.c +++ b/arch/x86/mm/kasan_init_64.c @@ -343,6 +343,10 @@ void __init kasan_init(void) unsigned long shadow_cea_begin, shadow_cea_per_cpu_begin, shadow_cea_end; int i; + /* If KASAN is disabled via command line, don't initialize it. */ + if (kasan_arg_disabled) + return; + memcpy(early_top_pgt, init_top_pgt, sizeof(early_top_pgt)); /* -- 2.52.0