From nobody Tue Apr 7 07:05:52 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 3C8133101D0 for ; Wed, 25 Feb 2026 08:16:38 +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=1772007399; cv=none; b=C2j5zEW8tilWU0dzM352E70RDeXLr8N8M2zZ9gSWTl8HHANfWqS0V8gwcob8AQIlbe7UrD7yRbkSNSi9P7xmhaavy/I5ZUxZWhZffSoVgHKlzPjWetjpqWvn11rh9PPzgQdlB4SV/kHnsXS+rAhu2R513X+CFtZfcKz9TOs8THY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772007399; c=relaxed/simple; bh=1lHMx/FF8IWFVtuF05q0r8NKEvr4j3zCT5/dcpLpt+8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-type; b=IuiLV8OA6gRTtNPGCS9kpFbmO80mdyc0RUaMknzTHYSl2a7VB5Q9ROqXpK1HlpJwfszEm/42H1H/rWnRn30L90bXU4tF6GukprQwV9yG8JlDx9GQGVpWUfXxIzr1VmxqXDQPKFfH7JUXIP5TLdFF1mHnD150xV+YTT8pAE/nsO8= 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=XD+T8j3A; 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="XD+T8j3A" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1772007397; 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=ufH5nmkXpWJzJI9ksuEPClUSVztzr8yoo3w4HNv6hNs=; b=XD+T8j3AnBCPFGU03kFD6MXuqtyT0mRkWX2vc++s5oYmHjmmEQyE0cI8PVDAmPl5xY+xVO PZRMzI+dksSF9bBhdIKanf6DLrN++Y3NLdsr2AE88cFkKUgTMu5DBZwu0Fx/8s9DYKZaqO 6mhvsNsSeiZYi9RBm4/947Z3FjZWqpc= Received: from mx-prod-mc-06.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-648-Jj4asdUeMuyAfccAe_OsEQ-1; Wed, 25 Feb 2026 03:16:33 -0500 X-MC-Unique: Jj4asdUeMuyAfccAe_OsEQ-1 X-Mimecast-MFC-AGG-ID: Jj4asdUeMuyAfccAe_OsEQ_1772007391 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-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id B293618005BC; 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> 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. 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; =20 + /* 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)); =20 /* --=20 2.52.0