A: http://en.wikipedia.org/wiki/Top_post Q: Were do I find info about this thing called top-posting? A: Because it messes up the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail? A: No. Q: Should I include quotations after my reply? http://daringfireball.net/2007/07/on_top On Thu, Feb 11, 2021 at 08:38:40AM +0000, Noam Liron wrote: > Hi Greg, > > I am writing you again on the below subject, as I would like to get a > "high level" opinion, and you are probably the most experienced ... I am not a DMA expert at all, why not ask the dma developers instead? > As I wrote below, I cannot rely on the DMA mask, as some USB > allocation are not affected by it. Why "some" and not "others"? Perhaps you need to fix your platform code to prevent that from happening instead? Why is USB unique here? > I thought of using private DMA pool that will be allocated where I > need it (at the start of physical memory). However, this means adding > specific ASIC code, which is less elegant. > Do you think that's the right way? I do not know your platform, only you do. But I do think you should not be doing new development on 4.14, as that is a very old and obsolete kernel and the dma code in the kernel has changed a lot since 2017. good luck! greg k-h
