From nobody Tue Apr 7 07:05:54 2026 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 98CF8311597 for ; Wed, 25 Feb 2026 08:15:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772007357; cv=none; b=B1Ef39njprdSEPywTxvfk2bJGYQvDhUgJwaZM6tHRKu0aAZ2u/0ex+Juf1W2y2gF6WUgCzfuViY82f1Gk8Fy0qb9iwIE35gX61T3apDKKZqDc7KFbIB7b4ANCbO1r1yogUPCAR5tDDo/T+HP5/PB2VIefEc2BGUAeJ+3O7R6Aog= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772007357; c=relaxed/simple; bh=37aHv6lE63s6b5fkAwqLZFnx5hCChq8VCQjAcavT0uk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-type; b=X2s6reswDvxkaz391ONsZlRB6Q4IqSyZ+QcQFAjLYwyTdWxNs49DE8mhsUG4XEf7Mb/eSdALgddtj3VjFgCEbUEHugMYQ3ro01jk53anEAR13wKpYEimRqMBotCUuLWnhLxFdvqAu7C1Yb9LzLjf/WV4CRa6QM8lVawDb2lDI3s= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=V05vutQR; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="V05vutQR" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1772007354; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=qbXEkZK+UBZ3F7j2MH1sXu6emUlCr8xCSA0nHJ3EKL0=; b=V05vutQRqBf9h7tY4tzubeoZFRBlno0ELN3CUrsLkAINB3FbYIYR/Z3IQ3Ent1pVKAsYiT 4Y6gh+rrjqRGKL9p0Gm2bjdWZl2bA2aEPRAES0rzay52YvHPNRrvmwIAd2q4bhgGsroE2v M78GaeMlbG4j4ZtQAHvgyPpWWxa0Mjs= Received: from mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-304-4chxBKYfMym28iynbNI3jg-1; Wed, 25 Feb 2026 03:15:50 -0500 X-MC-Unique: 4chxBKYfMym28iynbNI3jg-1 X-Mimecast-MFC-AGG-ID: 4chxBKYfMym28iynbNI3jg_1772007348 Received: from mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.111]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 0CB5F195609F; Wed, 25 Feb 2026 08:15:48 +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 C1E3A1800286; Wed, 25 Feb 2026 08:15:38 +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 07/15] arch/arm64: don't initialize kasan if it's disabled Date: Wed, 25 Feb 2026 16:14:04 +0800 Message-ID: <20260225081412.76502-8-bhe@redhat.com> In-Reply-To: <20260225081412.76502-1-bhe@redhat.com> References: <20260225081412.76502-1-bhe@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.111 Content-Type: text/plain; charset="utf-8" Here, kasan is disabled if specified 'kasan=3Doff' in kernel cmdline. And also need skip kasan_populate_early_vm_area_shadow() if kasan is disabled. Signed-off-by: Baoquan He Cc: linux-arm-kernel@lists.infradead.org --- arch/arm64/mm/kasan_init.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/arch/arm64/mm/kasan_init.c b/arch/arm64/mm/kasan_init.c index abeb81bf6ebd..4a58e609c81b 100644 --- a/arch/arm64/mm/kasan_init.c +++ b/arch/arm64/mm/kasan_init.c @@ -384,6 +384,9 @@ void __init kasan_populate_early_vm_area_shadow(void *s= tart, unsigned long size) { unsigned long shadow_start, shadow_end; =20 + if (!kasan_enabled()) + return; + if (!is_vmalloc_or_module_addr(start)) return; =20 @@ -397,6 +400,10 @@ void __init kasan_populate_early_vm_area_shadow(void *= start, unsigned long size) =20 void __init kasan_init(void) { + /* If KASAN is disabled via command line, don't initialize it. */ + if (kasan_arg_disabled) + return; + kasan_init_shadow(); kasan_init_depth(); kasan_init_generic(); --=20 2.52.0