From nobody Tue Jun 30 03:37:57 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B911BC2BA4C for ; Wed, 26 Jan 2022 09:27:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231645AbiAZJ07 (ORCPT ); Wed, 26 Jan 2022 04:26:59 -0500 Received: from szxga01-in.huawei.com ([45.249.212.187]:16740 "EHLO szxga01-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239114AbiAZJ0p (ORCPT ); Wed, 26 Jan 2022 04:26:45 -0500 Received: from canpemm500002.china.huawei.com (unknown [172.30.72.55]) by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4JkJCr5n5GzZfJv; Wed, 26 Jan 2022 17:22:48 +0800 (CST) Received: from huawei.com (10.175.124.27) by canpemm500002.china.huawei.com (7.192.104.244) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.21; Wed, 26 Jan 2022 17:26:43 +0800 From: Miaohe Lin To: CC: , , Subject: [PATCH] mm/memremap: avoid calling kasan_remove_zero_shadow() for device private memory Date: Wed, 26 Jan 2022 17:26:02 +0800 Message-ID: <20220126092602.1425-1-linmiaohe@huawei.com> X-Mailer: git-send-email 2.23.0 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Originating-IP: [10.175.124.27] X-ClientProxiedBy: dggems701-chm.china.huawei.com (10.3.19.178) To canpemm500002.china.huawei.com (7.192.104.244) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" For device private memory, we do not create a linear mapping for the memory because the device memory is un-accessible. Thus we do not add kasan zero shadow for it. So it's unnecessary to do kasan_remove_zero_shadow() for it. Signed-off-by: Miaohe Lin Reviewed-by: Muchun Song --- mm/memremap.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/mm/memremap.c b/mm/memremap.c index d2a72cf2ff83..d9e05952fff6 100644 --- a/mm/memremap.c +++ b/mm/memremap.c @@ -302,7 +302,8 @@ static int pagemap_range(struct dev_pagemap *pgmap, str= uct mhp_params *params, return 0; =20 err_add_memory: - kasan_remove_zero_shadow(__va(range->start), range_len(range)); + if (!is_private) + kasan_remove_zero_shadow(__va(range->start), range_len(range)); err_kasan: untrack_pfn(NULL, PHYS_PFN(range->start), range_len(range)); err_pfn_remap: --=20 2.23.0