Messages in this thread | | | Date | Thu, 31 Oct 2019 18:01:27 +0100 | From | Christoph Hellwig <> | Subject | Re: [PATCH 1/4] net: sgi: ioc3-eth: don't abuse dma_direct_* calls |
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On Thu, Oct 31, 2019 at 04:18:17PM +0100, Thomas Bogendoerfer wrote: > On Thu, 31 Oct 2019 14:15:01 +0100 > Christoph Hellwig <hch@lst.de> wrote: > > > On Thu, Oct 31, 2019 at 09:54:30AM +0100, Thomas Bogendoerfer wrote: > > > I didn't want to argue about that. What I'm interested in is a way how > > > to allocate dma memory, which is 16kB aligned, via the DMA API ? > > > > You can't. > > So then __get_free_pages() and dma_map_page() is the only way ?
Or dma_alloc_coherent + check alignment + allocate larger and align yourself. In practice you'll always get alignmened memory at the moment, but there is no API gurantee.
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