On Fri, May 10, 2019 at 10:11:10AM -0700, Christoph Hellwig wrote: > On Fri, May 10, 2019 at 09:50:01AM -0700, Matthew Wilcox wrote: > > kvmalloc() is the normal solution here. Usual reasons for not being > > able to do that would be that you do DMA to the memory or that you need > > to be able to free each of these objects individually. > > Note that you absolutely can do DMA to vmalloced buffers. It just is > very painful due to the manual coherency management.. ... and we don't have proper APIs for it. The last time we discussed it was January, I think. https://lore.kernel.org/patchwork/patch/1033921/ I haven't made any effort to try to come up with decent APIs for this.
