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Tue, 28 Apr 2020 08:32:04 -0700 (PDT) Date: Tue, 28 Apr 2020 17:32:02 +0200 From: Daniel Vetter To: Christoph Hellwig Subject: Re: [RFC 00/17] DRM: fix struct sg_table nents vs. orig_nents misuse Message-ID: <20200428153202.GY3456981@phenom.ffwll.local> Mail-Followup-To: Christoph Hellwig , Marek Szyprowski , dri-devel@lists.freedesktop.org, iommu@lists.linux-foundation.org, linaro-mm-sig@lists.linaro.org, linux-kernel@vger.kernel.org, Robin Murphy , Bartlomiej Zolnierkiewicz , Sumit Semwal , Benjamin Gaignard , intel-gfx@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, amd-gfx@lists.freedesktop.org, David Airlie References: <20200428132005.21424-1-m.szyprowski@samsung.com> <20200428140257.GA3433@lst.de> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200428140257.GA3433@lst.de> X-Operating-System: Linux phenom 5.3.0-3-amd64 Cc: Daniel Vetter , Bartlomiej Zolnierkiewicz , David Airlie , intel-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, iommu@lists.linux-foundation.org, amd-gfx@lists.freedesktop.org, Benjamin Gaignard , Robin Murphy , Sumit Semwal , linux-arm-kernel@lists.infradead.org X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On Tue, Apr 28, 2020 at 04:02:57PM +0200, Christoph Hellwig wrote: > On Tue, Apr 28, 2020 at 03:19:48PM +0200, Marek Szyprowski wrote: > > 1. introduce a dma_{map,sync,unmap}_sgtable() wrappers, which will use > > a proper sg_table entries and call respective DMA-mapping functions > > and adapt current code to it > > That sounds reasonable to me. Those could be pretty trivial wrappers. > > > > > > > 2. rename nents and orig_nents to nr_pages, nr_dmas to clearly state > > which one refers to which part of the scatterlist; I'm open for > > other names for those entries > > nr_cpu_ents and nr_dma_ents might be better names, but it still would be > a whole lot of churn for little gain. I think just good wrappers like > suggested above might be more helpful. I guess long-term we could aim for both? I.e. roll out better wrappers first, once that's soaked through the tree, rename the last offenders. Personally I like nr_cpu_ents and nr_dma_ents, that's about as clear as it gets. -Daniel -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu