On Fri, Aug 05, 2022 at 07:37:16PM +0200, Michal Hocko wrote: > GFP_DMA is a misnomer. It doesn't really say that the allocation should > be done for actual DMA. GFP_DMA really says allocate from ZONE_DMA. Yes. But in practice that either is to do DMA of some form, including the s390 variant not using the dma api, or completely stupid cargo cult code. > It > is my understanding that all actual DMA users should use a dedicated dma > allocation APIs which should do the right thing wrt. address constrains. Yes. And we were at a point where we got to that, but it seems somewhat recently a lot of people added completely stupid GFP_DMA kmallocs in the all over the crypto drivers. Sigh...
