From nobody Tue Apr 7 07:05:53 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 7D247311946 for ; Wed, 25 Feb 2026 08:15:36 +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=1772007339; cv=none; b=I/cI/S9ADKbC+qi3FSsgdoJdNsm14woX9dEMCAfQJHmFp0FWusYeRN/k8CvleBsIbXajlIC0lVxEtZRB41xZD9yGtxgsCLuslBsbsIEGAGXmemOC8+4Pw98Vp4mZKBsxP2g+lqLV9lL1u8FpFyzF2hN5lf/vo4OtHbBr6EuAmRU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772007339; c=relaxed/simple; bh=cgQzSM5LqzZK4i+fA2K/dU878k0hNbHBoTpbrWkwvCo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-type; b=a/ltW8DqcnRoLSW2olegcObzGyrIqRIWf0tmsV43UFRtby+Y0MJ2H78a6/c8KipqL9G1Ok/EePJzfML6OG2FVCcm8HeFO7e36uceyoB+jz0CgOBcJh93PSk1Ijx6JehdsuWKyNNuXZDlUYK40s9lFBJCh7dpXGBqCGYY0PyNNhA= 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=gHnRQHFp; 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="gHnRQHFp" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1772007335; 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=iXwY0Q2SJZmWL1WR2SYctHtbhbAGYnU1QS3gfwuZnJo=; b=gHnRQHFpgF54yaIFQdPcPgtW1KqxP8pvUji61vDNv1Pxj5bpyk11hhWumrmWQAxVv8VhDc xpMaL9vBOKUb2o4PJN23VsQfZDaBWFUIABg4KdUsPYwMl2AhjPXQxbbGkHXB05CXvHp0Hs 4ZullyM8CA1nnlQ3P7Xl2j5vGlN6d0k= Received: from mx-prod-mc-03.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-338-W_q9ig0KNGOLXjAkoHCtsg-1; Wed, 25 Feb 2026 03:15:31 -0500 X-MC-Unique: W_q9ig0KNGOLXjAkoHCtsg-1 X-Mimecast-MFC-AGG-ID: W_q9ig0KNGOLXjAkoHCtsg_1772007329 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-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 989F01956068; Wed, 25 Feb 2026 08:15:28 +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 03B561800351; Wed, 25 Feb 2026 08:15:19 +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 05/15] mm/kasan/sw_tags: don't initialize kasan if it's disabled Date: Wed, 25 Feb 2026 16:14:02 +0800 Message-ID: <20260225081412.76502-6-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 --- mm/kasan/sw_tags.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/mm/kasan/sw_tags.c b/mm/kasan/sw_tags.c index 6c1caec4261a..7757b69b1c86 100644 --- a/mm/kasan/sw_tags.c +++ b/mm/kasan/sw_tags.c @@ -40,6 +40,10 @@ void __init kasan_init_sw_tags(void) { int cpu; =20 + /* If KASAN is disabled via command line, don't initialize it. */ + if (kasan_arg_disabled) + return; + for_each_possible_cpu(cpu) per_cpu(prng_state, cpu) =3D (u32)get_cycles(); =20 --=20 2.52.0