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 gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (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 E4CBFC61DD6 for ; Wed, 2 Sep 2026 07:39:42 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 0FD3810F03A; Wed, 2 Sep 2026 07:39:42 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.b="SVevXqP8"; dkim-atps=neutral Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by gabe.freedesktop.org (Postfix) with ESMTPS id 29B6E10F03A for ; Wed, 2 Sep 2026 07:39:41 +0000 (UTC) Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id EAE0F43ECF; Wed, 2 Sep 2026 07:39:40 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 10CDF1F000E9; Wed, 2 Sep 2026 07:39:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1788334780; bh=Zmj6Pl4DI8aaARUoVXtREi8xmgkB7kHiiAcvl0t361M=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=SVevXqP8uk4G2qfUr4fRwo9Xv9i/jYjJ+Hift6ITqhh0R31kK+7v5WOiOo9/0ie7j 4sOXgFXmks/B/0h/21DcWitUMKDWxZYTLiyRsIbbyZZZpO+nouiDx+4eAKL3bch964 Z0ITjST2BqJve2jB5bjPfpMiqhwbV+7s5F4A2fofmPN494nOQZjDhr0n7HKxZeRvBB yfEtheDm5PrO5mtXXpRM3Bx6CPq/6gY14VOKrtpn77K0Fbgi6LM5j3nbK0pUgMpnnU 2tbzJBXwpgQ2gxvoVNI2PhV6fP7prCxJ05MvzwtMjBEiZwd+CPTJ5WYN4VsnP3/wkq UWLcYuhjXx0uQ== Date: Wed, 2 Sep 2026 10:39:36 +0300 From: Leon Romanovsky To: Christian =?iso-8859-1?Q?K=F6nig?= Cc: David Hu , sumit.semwal@linaro.org, alex@shazbot.org, ankita@nvidia.com, chriscli@google.com, david.laight.linux@gmail.com, dri-devel@lists.freedesktop.org, iommu@lists.linux.dev, jgg@ziepe.ca, jmoroni@google.com, kevin.tian@intel.com, kpberry@google.com, linaro-mm-sig@lists.linaro.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, nicolinc@nvidia.com, praan@google.com, sashiko-bot@kernel.org, stable@vger.kernel.org, viursachi@google.com, xuehaohu@google.com Subject: Re: [PATCH v8 0/2] dma-buf: Fix silent overflow and alignment Message-ID: <20260902073936.GR24140@unreal> References: <20260901170849.4052816-1-dhu@x6u.co> <2bf581db-7cc5-4f38-a075-1b988c332f3c@amd.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <2bf581db-7cc5-4f38-a075-1b988c332f3c@amd.com> X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" On Wed, Sep 02, 2026 at 09:00:46AM +0200, Christian König wrote: > On 9/1/26 19:08, David Hu wrote: > > From: David Hu > > > > This series address two related issues in scatter-gather mapping, > > specifically for the MMIO based dma-buf mapping. The fixes ensure > > sgt mapping is correct, and proper for large MMIO regions. > > > > Patch 1 fixes a silent integer overflow for mapping length exceeding 4G > > (Previously submitted as [PATCH v7] dma-buf: Fix silent overflow for > > phys vec to sgt) > > https://lore.kernel.org/all/20260609164047.486227-1-xuehaohu@google.com/ > > > > Patch 2 Splits sgl by largest page aligned chunk > > (Previously submitted as [PATCH v3] dma-buf: Split sgl by largest page-aligned chunk) > > https://lore.kernel.org/all/20260722233806.3922093-1-dhu@x6u.co/ > > *sigh* such issues are exactly the reason why I didn't wanted the dma-mapping stuff inside DMA-buf. That clearly doesn't belong here. And this is why so many in the kernel community want to get rid of SG lists. It would be great if DMA-BUF could also eliminate the need to convert to an SGL, like Jason proposed. The DMA layer no longer needs SGL. These bugs belong to the DMA-BUF layer, which is the one that depends on it. Thanks