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Date: Tue, 25 Aug 2020 15:26:12 +0200 From: Christoph Hellwig <hch@....de> To: Marek Szyprowski <m.szyprowski@...sung.com> Cc: Christoph Hellwig <hch@....de>, Mauro Carvalho Chehab <mchehab@...nel.org>, Thomas Bogendoerfer <tsbogend@...ha.franken.de>, "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>, Joonyoung Shim <jy0922.shim@...sung.com>, Seung-Woo Kim <sw0312.kim@...sung.com>, Kyungmin Park <kyungmin.park@...sung.com>, Ben Skeggs <bskeggs@...hat.com>, Pawel Osciak <pawel@...iak.com>, Matt Porter <mporter@...nel.crashing.org>, iommu@...ts.linux-foundation.org, Tom Lendacky <thomas.lendacky@....com>, linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org, linux-media@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-ia64@...r.kernel.org, linux-mips@...r.kernel.org, linux-parisc@...r.kernel.org, linux-samsung-soc@...r.kernel.org, nouveau@...ts.freedesktop.org, netdev@...r.kernel.org, linux-nvme@...ts.infradead.org, linux-scsi@...r.kernel.org, linux-mm@...ck.org, alsa-devel@...a-project.org Subject: Re: a saner API for allocating DMA addressable pages On Tue, Aug 25, 2020 at 01:30:41PM +0200, Marek Szyprowski wrote: > I really wonder what is the difference between this new API and > alloc_pages(GFP_DMA, n). Is this API really needed? I thought that this > is legacy thing to be removed one day... The difference is that the pages returned are guranteed to be addressable by the devie. This is a very important difference that matters for a lot of use cases.
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