From mboxrd@z Thu Jan 1 00:00:00 1970 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 531BEC43458 for ; Thu, 2 Jul 2026 15:45:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=59qEucnyS37/pT7/a7uWPu4mSZu2iXHdYUdedzUuCWw=; b=B1vuOR3Yvm2BYesBEUcHvHYblf veAh3hJPa8UAUBjNc17v8fg7iYvhJ2OBs4SHX8Te434hHDTgyvGa2FsktpIEMiWulv6jPTVx362AS tvyYjN5ElplzFmW5sPSCFJW60bkud7fhZSCJGe4hU40tzCWePdNvTluE7ECqbridSIdsITAhGSba9 POpxNTLd3RA+uKkp37qUE8G3yoGLDqHMOXeenVFFQTbijhWjfAioi5oTNshHCV/3BpbF56XteLpFX K4nIpPgy6ef2S6vGrDjsjS07G+aXe9PxtD0MIBFfxf2+FPZJ3GOn4jyYgLP5Mt+VLTc57EIdGTm9b gBK9wVcQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wfJb7-00000004qfp-46kO; Thu, 02 Jul 2026 15:45:06 +0000 Received: from tor.source.kernel.org ([2600:3c04:e001:324:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wfJb6-00000004qfG-0t5N for linux-arm-kernel@lists.infradead.org; Thu, 02 Jul 2026 15:45:04 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id 422B7601ED; Thu, 2 Jul 2026 15:45:03 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 96E0E1F000E9; Thu, 2 Jul 2026 15:44:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1783007103; bh=59qEucnyS37/pT7/a7uWPu4mSZu2iXHdYUdedzUuCWw=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=jfxx93mI0WsTjXM2lMZUbF2ST+JdPutWFbARMvB51yaDLU9YGWXmV9QMfDby1IEQy IzZj6IdNYraKUtE9BsLegmT+cQOSrhTMUINWE8Om4Qp48PzK+YM3NsWg1kB6ibut1H MicgLWR8xf4GpI/6j30u/A+EqC38wAWC59qzH0ufvDz/NUVqaxZ8jXkJzBTpT64FYd OQ6h6FSB29/P+QTA5/gxQ5RTVIRuIsBQ5Ap4QoA0vlOkVSnDX+sgH5lEsgEuzfvTuB iLsG+LQWrclkBwcgnIMQuXEhRhqvbpSs4rsDRyYrGY07IixObcgXBv1Kga1H/3uUtL aZUTo5wGNSyWg== Message-ID: <210eb5d7-2b74-441e-87c6-f51f484cbde3@kernel.org> Date: Thu, 2 Jul 2026 17:44:52 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 5/6] mm/page_vma_mapped: use huge_ptep_get() for hugetlb To: Dev Jain , muchun.song@linux.dev, osalvador@suse.de, akpm@linux-foundation.org, ljs@kernel.org, liam@infradead.org Cc: riel@surriel.com, vbabka@kernel.org, harry@kernel.org, jannh@google.com, lance.yang@linux.dev, kas@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, rcampbell@nvidia.com, apopple@nvidia.com, ziy@nvidia.com, matthew.brost@intel.com, joshua.hahnjy@gmail.com, rakie.kim@sk.com, byungchul@sk.com, gourry@gourry.net, ying.huang@linux.alibaba.com, j-nomura@ce.jp.nec.com, nao.horiguchi@gmail.com, ak@linux.intel.com, mel@csn.ul.ie, pfalcato@suse.de, jpoimboe@kernel.org, dave.hansen@intel.com, tglx@kernel.org, catalin.marinas@arm.com, will@kernel.org, linux-arm-kernel@lists.infradead.org, ryan.roberts@arm.com, anshuman.khandual@arm.com, stable@vger.kernel.org References: <20260702051341.126509-1-dev.jain@arm.com> <20260702051341.126509-6-dev.jain@arm.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 7/2/26 07:13, Dev Jain wrote: > check_pte() is the final validation step in page_vma_mapped_walk(). > It reads pvmw->pte with ptep_get() to decide whether the entry maps > the PFN range being walked. For hugetlb VMAs, that pointer refers > to a hugetlb entry. > > On arches which provide their own huge_ptep_get() to dereference a huge > pte pointer, accessing via ptep_get() would cause pte_pfn(), > pte_present() etc to misbehave. > > It is not clear whether this has a trivially visible effect to userspace. > > Use huge_ptep_get() to dereference a huge pte pointer. > > Fixes: ace71a19cec5 ("mm: introduce page_vma_mapped_walk()") > Cc: stable@vger.kernel.org > Signed-off-by: Dev Jain > --- Acked-by: David Hildenbrand (Arm) -- Cheers, David