Re: a saner API for allocating DMA addressable pages
- From
- Christoph Hellwig <hch@lst.de>
- Date
- 2020-08-25 13:26:28
- Also in
- alsa-devel, linux-arm-kernel, linux-iommu, linux-media, linux-mips, linux-mm, linux-nvme, linux-samsung-soc, linux-scsi, lkml, netdev, nouveau
- Reply to
- Marek Szyprowski, 2020-08-25
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.